Siemens SIWAREX WP251 User manual

SIWAREX WP251
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Weighing systems
Electronic Weighing System
SIWAREX WP251
Manual
12/2015
A5E37203357A
Introduction
1
Safety notes
2
Description
3
Application planning
4
Mounting
5
Connection
6
Commissioning
7
Scale parameters and
functions
8
Errors and messages
9
Command lists
10
Communication with
SIMATIC S7-1200
11
Operation requiring official
calibration
12
Technical specifications
13
Accessory
14
ESD guidelines
A
List of abbreviations
B

Siemens AG
Division Process Industries and Drives
Postfach 48 48
90026 NÜRNBERG
GERMANY
Document order number: A5E37203357A
Ⓟ
12/2015 Subject to change
Copyright © Siemens AG 2015.
All rights reserved
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by
personnel qualified
for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

SIWAREX WP251
Manual, 12/2015, A5E37203357A 3
Table of contents
1 Introduction........................................................................................................................................... 15
1.1 Purpose of the manual............................................................................................................15
1.2 Basic knowledge required.......................................................................................................15
1.3 Manual - range of validity........................................................................................................15
1.4 Technical support....................................................................................................................15
2 Safety notes.......................................................................................................................................... 17
2.1 General safety instructions .....................................................................................................17
2.2 Security messages..................................................................................................................17
3 Description............................................................................................................................................ 19
3.1 Product overview ....................................................................................................................19
3.2 Area of application ..................................................................................................................19
3.3 System integration in SIMATIC...............................................................................................19
3.4 Scope of delivery ....................................................................................................................20
4 Application planning.............................................................................................................................. 21
4.1 Functions ................................................................................................................................21
4.2 Parameter assignment options ...............................................................................................21
4.2.1 Parameter assignment with the PC ........................................................................................21
4.2.2 Parameter assignment with a SIMATIC Panel .......................................................................22
4.2.3 Parameter assignment by means of the Modbus interface ....................................................23
5 Mounting............................................................................................................................................... 25
5.1 Installation guideline ...............................................................................................................25
5.2 EMC-compliant installation .....................................................................................................25
5.2.1 Introduction .............................................................................................................................25
5.2.2 Possible effects of interference...............................................................................................25
5.2.3 Coupling mechanisms.............................................................................................................26
5.2.4 Five basic rules for securing EMC ..........................................................................................26
5.3 Mounting on the SIMATIC S7-1200........................................................................................27
6 Connection ........................................................................................................................................... 29
6.1 Overview .................................................................................................................................29
6.2 24 V connection ......................................................................................................................30
6.3 Connecting the load cells........................................................................................................30
6.4 Shield connection....................................................................................................................31
6.5 Connection of digital outputs (4 x DQ)....................................................................................34

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6.6 Connection of digital inputs (4 x DI)....................................................................................... 35
6.7 Connection of the analog output (1 x AQ) ............................................................................. 36
6.8 Connection of RS485 serial interface .................................................................................... 36
6.9 Connection of Siebert display via RS485 .............................................................................. 37
6.10 Connection of the Ethernet interface ..................................................................................... 38
6.11 Activation of write protection .................................................................................................. 38
6.12 Attachment of calibration protection plate.............................................................................. 39
7 Commissioning ..................................................................................................................................... 41
7.1 Introduction ............................................................................................................................ 41
7.2 Factory setting of the mode selector...................................................................................... 41
7.3 Automatic quick calibration with SIWATOOL......................................................................... 42
7.3.1 Overview ................................................................................................................................ 42
7.3.2 Activate service mode............................................................................................................ 43
7.3.3 Load standard parameters..................................................................................................... 43
7.3.4 Input of required parameters.................................................................................................. 44
7.3.5 Complete automatic calibration.............................................................................................. 45
7.3.6 Receive all data...................................................................................................................... 45
7.3.7 Checking the scale after calibration ....................................................................................... 45
7.4 Quick calibration with calibration weights and SIWATOOL ................................................... 46
7.4.1 Introduction ............................................................................................................................ 46
7.4.2 Activate service mode............................................................................................................ 46
7.4.3 Load standard parameters..................................................................................................... 46
7.4.4 Input of required parameters.................................................................................................. 46
7.4.5 Calibration .............................................................................................................................. 47
7.4.6 Receive all data...................................................................................................................... 48
7.4.7 Checking the scale following calibration ................................................................................ 48
7.5 Service with the SIWATOOL program ................................................................................... 48
7.5.1 General .................................................................................................................................. 48
7.5.2 Windows and functions of SIWATOOL.................................................................................. 49
7.5.3 Offline parameter assignment................................................................................................ 50
7.5.4 IP address for SIWAREX ....................................................................................................... 50
7.5.4.1 Introduction ............................................................................................................................ 50
7.5.4.2 Entering a known SIWAREX IP address ............................................................................... 51
7.5.4.3 Determining an unknown IP address ..................................................................................... 51
7.5.4.4 Setting up a network .............................................................................................................. 51
7.5.5 Online parameter assignment................................................................................................ 51
7.5.6 Entering parameters with SIWATOOL................................................................................... 52
7.5.7 Recording scale traces .......................................................................................................... 52
7.5.8 Firmware update .................................................................................................................... 53
7.5.9 Reading out the saved scale logs .......................................................................................... 55
8 Scale parameters and functions ............................................................................................................ 57
8.1 Parameters and functions ...................................................................................................... 57
8.2 Weighing steps....................................................................................................................... 58
8.2.1 Introduction ............................................................................................................................ 58
8.2.2 Operating mode NAWI (non-automatic weighing instrument) - Filling................................... 58

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8.2.3 Operating mode NAWI (non-automatic weighing instrument) - Removal...............................59
8.2.4 Operating mode AWI (automatic weighing instruments) ........................................................59
8.2.5 Operating mode ACI (automatic catchweighing instruments) - Filling....................................60
8.2.6 Operating mode ACI (automatic catchweighing instruments) - Removal...............................61
8.3 DR 3 Calibration parameters ..................................................................................................61
8.3.1 Overview .................................................................................................................................61
8.3.2 Scale name .............................................................................................................................66
8.3.3 Unit of weight ..........................................................................................................................66
8.3.4 Gross identifier........................................................................................................................66
8.3.5 Code for regulations................................................................................................................67
8.3.6 Minimum weighing range ........................................................................................................67
8.3.7 Maximum weighing range.......................................................................................................67
8.3.8 Calibration weights 0, 1, 2 and calibration digits 0, 1, 2 .........................................................67
8.3.9 Scale interval ..........................................................................................................................68
8.3.10 Zero by power-on....................................................................................................................68
8.3.11 Zero by power-on when tare ≠ 0.............................................................................................68
8.3.12 Automatic zero adjustment .....................................................................................................68
8.3.13 Subtractive / additive tare device............................................................................................69
8.3.14 Weight simulation allowed ......................................................................................................69
8.3.15 Automatic zero tracking ..........................................................................................................69
8.3.16 Maximum tare load .................................................................................................................70
8.3.17 Maximum negative zero setting limit (power-on) ....................................................................70
8.3.18 Maximum positive zero setting limit (power-on) .....................................................................
70
8.3.19 Maximum negative zero setting limit (semi-automatically) .....................................................70
8.3.20 Maximum positive zero setting limit (semi-automatically).......................................................71
8.3.21 Standstill monitoring................................................................................................................71
8.3.22 Standstill 1 - range ..................................................................................................................72
8.3.23 Standstill 1 - time ....................................................................................................................72
8.3.24 Max. waiting time for standstill 1.............................................................................................72
8.3.25 Standstill 2 - range ..................................................................................................................73
8.3.26 Standstill 2 - time ....................................................................................................................73
8.3.27 Setting time before standstill 2................................................................................................73
8.3.28 Frequency low pass filter 1 .....................................................................................................74
8.3.29 Order no. low pass filter 1.......................................................................................................74
8.3.30 Depth average filter.................................................................................................................74
8.3.31 Weighing operating mode.......................................................................................................75
8.3.32 SecureDisplay including weighing range data........................................................................75
8.3.33 SecureDisplay interface ..........................................................................................................75
8.3.34 SecureDisplay version ............................................................................................................75
8.3.35 Smallest zoom factor of SecureDisplay..................................................................................75
8.3.36 Grid frequency ........................................................................................................................75
8.4 Calibration...............................................................................................................................76
8.4.1 Calibration with calibration weights.........................................................................................76
8.4.2 Automatic calibration...............................................................................................................78
8.5 DR 4 Output of calculated calibration digits............................................................................
79
8.5.1 Overview .................................................................................................................................79
8.5.2 Calibration digits 0, 1, 2 (calculated).......................................................................................80
8.6 DR 5 Tare / zero memory .......................................................................................................80
8.6.1 Overview .................................................................................................................................80
8.6.2 Effective tare weight - from specification 1, 2 or 3..................................................................81

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8.6.3 Effective tare weight (semi-automatic)................................................................................... 81
8.6.4 Zero by power-on (value when switching on) ........................................................................ 82
8.6.5 Zero weight (semi-automatic) ................................................................................................ 82
8.6.6 Current zero tracking weight .................................................................................................. 82
8.6.7 Dead load............................................................................................................................... 82
8.7 DR 6 Limits............................................................................................................................. 82
8.7.1 Overview ................................................................................................................................ 82
8.7.2 Limit value 1 ON, limit value 2 ON, limit value 1 OFF, limit value 2 OFF .............................. 84
8.7.3 Switch-on delay limit 3 (empty).............................................................................................. 85
8.7.4 Limit 3 - empty........................................................................................................................ 85
8.8 DR 7 Process interfaces ........................................................................................................ 86
8.8.1 Overview ................................................................................................................................ 86
8.8.2 Assignment of digital input DI.0, DI.1, DI.2, DI.3 ................................................................... 90
8.8.3 Input filtering (hardware setting) ............................................................................................ 91
8.8.4 Assignment of digital output DQ.0, DQ.1, DQ.2, DQ.3.......................................................... 91
8.8.5 Response of digital outputs to faults or SIMATIC STOP ....................................................... 92
8.8.6 Substitute value for DQ 0, 1, 2, 3 following fault or SIMATIC STOP ..................................... 92
8.8.7 Analog output range............................................................................................................... 93
8.8.8 Analog output source ............................................................................................................. 93
8.8.9 Response of analog output to faults or SIMATIC STOP........................................................ 93
8.8.10 Start value for the analog output............................................................................................ 93
8.8.11 End value for the analog output ............................................................................................. 93
8.8.12 Output value following fault or SIMATIC STOP ..................................................................... 94
8.8.13 Trace recording cycle............................................................................................................. 94
8.8.14 Trace storage method............................................................................................................ 94
8.9 DR 8 date and time ................................................................................................................ 95
8.10 DR 9 module information ....................................................................................................... 95
8.11 DR 10 Load cell parameters .................................................................................................. 96
8.11.1 Overview ................................................................................................................................ 96
8.11.2 Number of support points....................................................................................................... 97
8.11.3 Load cell characteristic value................................................................................................. 98
8.11.4 Rated load of a load cell ........................................................................................................ 98
8.12 DR 12 Ethernet parameters ................................................................................................... 98
8.12.1 Overview ................................................................................................................................ 98
8.12.2 Device MAC address ............................................................................................................. 99
8.12.3 Port MAC address.................................................................................................................. 99
8.12.4 IP address .............................................................................................................................. 99
8.12.5 Subnet mask ........................................................................................................................ 100
8.12.6 Gateway ............................................................................................................................... 100
8.12.7 Device name ........................................................................................................................ 100
8.13 DR 13 RS485 parameters.................................................................................................... 100
8.13.1 Overview .............................................................................................................................. 100
8.13.2 RS485 protocol .................................................................................................................... 102
8.13.3 RS485 baud rate.................................................................................................................. 102
8.13.4 RS485 character parity ........................................................................................................ 102
8.13.5 RS485 number of data bits .................................................................................................. 102
8.13.6 RS485 number of stop bits .................................................................................................. 103
8.13.7 RS485 Modbus address ...................................................................................................... 103
8.13.8 Decimal place for Siebert indicator ...................................................................................... 103

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8.14 DR 14 Selection process value 1, 2......................................................................................103
8.15 DR 15 Preset tare .................................................................................................................104
8.15.1 Overview ...............................................................................................................................104
8.15.2 Preset tare weight 1 ..............................................................................................................105
8.16 DR 16 Weight simulation ......................................................................................................105
8.16.1 Overview ...............................................................................................................................105
8.16.2 Weight simulation specification.............................................................................................106
8.17 DR 17 Control analogue output ............................................................................................106
8.17.1 Overview ...............................................................................................................................106
8.17.2 Analog output specification...................................................................................................106
8.18 DR18 Control digital outputs.................................................................................................107
8.18.1 Overview ...............................................................................................................................107
8.18.2 Specification for digital outputs DQ.0, DQ.1, DQ.2, DQ.3 ....................................................108
8.18.3 Transitions for weighing steps 0 to 7 ....................................................................................108
8.19 DR 20 Single set point ..........................................................................................................109
8.19.1 Overview ...............................................................................................................................109
8.19.2 Single set point .....................................................................................................................109
8.20 DR 21 Total set point ............................................................................................................110
8.20.1 Overview ...............................................................................................................................110
8.20.2 Total set point .......................................................................................................................110
8.21 DR 22 Tolerance parameters ...............................................................................................111
8.21.1 Overview ...............................................................................................................................111
8.21.2 Parameter relation ................................................................................................................115
8.21.3 Tolerance limit TH2...............................................................................................................
116
8.21.4 Tolerance limit TH1...............................................................................................................116
8.21.5 Tolerance limit TL1 ...............................................................................................................116
8.21.6 Tolerance limit TL2 ...............................................................................................................116
8.21.7 Behavior in case of TH1 error...............................................................................................116
8.21.8 Behavior in case of TL1 error ...............................................................................................116
8.21.9 Pulse duration for pulse post dosing.....................................................................................116
8.21.10 Number of not controlled weighings .....................................................................................117
8.21.11 Capture of weighings into statistics ......................................................................................117
8.22 DR 23 Material parameters...................................................................................................118
8.22.1 Overview ...............................................................................................................................118
8.22.2 Parameter relation ................................................................................................................119
8.22.3 Fine weight............................................................................................................................119
8.22.4 Trailing weight.......................................................................................................................119
8.22.5 Blocking time coarse signal ..................................................................................................120
8.22.6 Blocking time fine signal .......................................................................................................120
8.22.7 Shut-off correction weight .....................................................................................................121
8.23 DR 24 Controller and filter parameters .................................................................................121
8.23.1 Overview ...............................................................................................................................121
8.23.2 Parameter relation ................................................................................................................123
8.23.3 Type of controller ..................................................................................................................123
8.23.4 Control factor of proportional controller ................................................................................
123
8.23.5 Maximum corrective action ...................................................................................................123
8.23.6 Controller deadband - upper limit .........................................................................................124
8.23.7 Controller deadband - lower limit ..........................................................................................
124

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8.23.8 Reaction when max. corrective action is exceeded............................................................. 124
8.23.9 Selection for dosing filter...................................................................................................... 124
8.23.10 Frequency low pass filter 2 .................................................................................................. 125
8.23.11 Order no. low pass filter 2 .................................................................................................... 125
8.23.12 Depth average filter.............................................................................................................. 126
8.23.13 Adopt corrected fine/trailing value to DR 23 automatically .................................................. 126
8.24 DR 25 Dosing device parameters ........................................................................................ 126
8.24.1 Overview .............................................................................................................................. 126
8.24.2 Maximum single set point .................................................................................................... 128
8.24.3 "Coarse" set value for analogue output ............................................................................... 128
8.24.4 "Fine" set value for analogue output .................................................................................... 129
8.24.5 Minimum automatic tare weight ........................................................................................... 129
8.24.6 Maximum automatic tare weight .......................................................................................... 129
8.24.7 Maximum weighing time ...................................................................................................... 129
8.24.8 Weighing start options ......................................................................................................... 130
8.24.9 Cycle time for automatic zero setting................................................................................... 130
8.24.10 Number of weighings without automatic taring/zero setting ................................................ 130
8.24.11 Check stop ........................................................................................................................... 130
8.24.12 Automatic emptying ............................................................................................................. 131
8.24.13 Emptying time ...................................................................................................................... 131
8.24.14 Maximum emptying time ...................................................................................................... 131
8.25 DR 28 Additional strings for log ........................................................................................... 132
8.25.1 Overview .............................................................................................................................. 132
8.25.2 Strings 1, 2, 3 and 4............................................................................................................. 132
8.25.3 Sting selection for automatic logging ................................................................................... 133
8.26 DR 29 Configuration of technology messages .................................................................... 133
8.27 DR 30 Process state ............................................................................................................ 135
8.27.1 Overview .............................................................................................................................. 135
8.27.2 Gross, net and tare process values ..................................................................................... 140
8.27.3 Gross, net and tare weights ................................................................................................. 140
8.27.4 Gross/Net weight x10........................................................................................................... 140
8.27.5 Gross/Net process weight 2................................................................................................. 140
8.27.6 Refresh counter.................................................................................................................... 140
8.27.7 Actual weight of last dosing ................................................................................................. 140
8.27.8 Totalizer 1 and Totalizer 2 ................................................................................................... 140
8.27.9 Youngest protocol-ID ........................................................................................................... 141
8.27.10 Date & time .......................................................................................................................... 141
8.27.11 Current weighing step .......................................................................................................... 141
8.28 DR 31 Process state extended ............................................................................................ 141
8.28.1 Overview .............................................................................................................................. 141
8.28.2 Unfiltered digit value ............................................................................................................ 143
8.28.3 Digits filtered by F1 .............................................................................................................. 143
8.28.4 Filtered digit value 2............................................................................................................. 143
8.28.5 Current analog output (mA) ................................................................................................. 144
8.28.6 Current analog output (digits) .............................................................................................. 144
8.28.7 Current status digital input DI.0, DI.1, DI.2 and DI.3............................................................ 144
8.28.8 DIP switch 1 and 2 ............................................................................................................... 144
8.28.9 Current status digital output DQ.0, DQ.1, DQ.2 and DQ.3 .................................................. 144
8.28.10 Refresh counter.................................................................................................................... 144
8.28.11 Current load cell signal in mV .............................................................................................. 145

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8.28.12 Current fine weight................................................................................................................145
8.28.13 Current trailing weight...........................................................................................................145
8.28.14 Tolerance limits TH2, TH1, TL1 and TL2..............................................................................145
8.29 DR 32 Error messages .........................................................................................................145
8.29.1 Overview ...............................................................................................................................145
8.29.2 Operating errors, technology messages, data/command errors ..........................................150
8.30 DR 34 ASCII weight display..................................................................................................150
8.30.1 Overview ...............................................................................................................................150
8.30.2 Content of the display string .................................................................................................150
8.31 DR 35 SecureDisplay data ...................................................................................................151
8.32 DR 38 Min/max pointer .........................................................................................................152
8.33 DR 39 Statistics ....................................................................................................................152
8.34 DR 41/42 Data memory ........................................................................................................154
8.35 DR 45 Protocol request.........................................................................................................155
8.35.1 Overview ...............................................................................................................................155
8.35.2 Protocol ID to be read...........................................................................................................156
8.36 DR 46 Protocol content.........................................................................................................157
8.36.1 Overview ...............................................................................................................................157
8.36.2 Oldest report ID.....................................................................................................................158
8.36.3 Newest report ID ...................................................................................................................158
8.36.4 Selected protocol-ID .............................................................................................................158
8.36.5 Protocol.................................................................................................................................158
8.36.6 Date, time..............................................................................................................................159
8.37 DR 47 Logbook .....................................................................................................................159
8.38 DR 48 date and time 2 (for Modbus) ....................................................................................160
9 Errors and messages .......................................................................................................................... 163
9.1 Message and error types ......................................................................................................163
9.2 Message paths......................................................................................................................163
9.3 Evaluating errors/messages with the help of SIWATOOL....................................................164
9.4 Evaluating errors/messages with the help of the function block...........................................164
9.5 Evaluating errors/messages using Modbus..........................................................................164
9.6 Operating errors....................................................................................................................164
9.6.1 Operating errors....................................................................................................................164
9.6.2 Technology messages ..........................................................................................................165
9.6.3 Data and command errors ....................................................................................................167
9.6.4 Data and command errors - Additional information ..............................................................172
9.6.5 Messages by LEDs on the module .......................................................................................177
10 Command lists .................................................................................................................................... 179
10.1 Overview ...............................................................................................................................179
10.2 Command lists ......................................................................................................................179
10.3 Command groups of the SIWAREX WP251.........................................................................184

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11 Communication with SIMATIC S7-1200 ...............................................................................................185
11.1 Integration in SIMATIC S7-1200.......................................................................................... 185
11.1.1 General information ............................................................................................................. 185
11.1.2 Creating the hardware configuration.................................................................................... 186
11.1.3 Calling of function block ....................................................................................................... 188
11.1.4 Working with the function block ........................................................................................... 189
11.1.5 I/O interface of function block .............................................................................................. 191
11.1.6 Error codes of function block ............................................................................................... 192
11.2 Communication via Modbus................................................................................................. 193
11.2.1 Introduction .......................................................................................................................... 193
11.2.2 Principle of data transmission.............................................................................................. 193
11.2.3 Data record concept............................................................................................................. 194
11.2.4 Command mailboxes ........................................................................................................... 195
11.2.5 Reading registers................................................................................................................. 195
11.2.6 Writing registers ................................................................................................................... 196
12 Operation requiring official calibration...................................................................................................197
12.1 Preparing for calibration....................................................................................................... 197
12.1.1 Calibration set ...................................................................................................................... 197
12.1.2 Scale design......................................................................................................................... 197
12.1.3 Installation and parameter assignment of the calibratable SecureDisplay main display
in the HMI............................................................................................................................. 197
12.1.4 Parameterization of the scale .............................................................................................. 198
12.1.5 Adjustment and preliminary checking of the scale............................................................... 198
12.1.6 Calibration label ................................................................................................................... 198
12.2 Verification ........................................................................................................................... 198
12.2.1 Checking of parameters relevant to the verification............................................................. 198
12.2.2 Checking of parameters relevant to the device ................................................................... 200
13 Technical specifications .......................................................................................................................203
13.1 Technical specifications ....................................................................................................... 203
13.2 Electrical, EMC and climatic requirements .......................................................................... 207
13.3 Approvals ............................................................................................................................. 211
14 Accessory............................................................................................................................................213
A ESD guidelines ....................................................................................................................................215
A.1 ESD Guidelines.................................................................................................................... 215
B List of abbreviations .............................................................................................................................217
B.1 List of abbreviations ............................................................................................................. 217
Index ...................................................................................................................................................219
Tables
Table 6- 1 Connection of the 24 V supply .....................................................................................................30
Table 6- 2 Load cell connections on the module...........................................................................................31
Table 6- 3 Connection of the digital outputs..................................................................................................35

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Table 6- 4 Connection of the digital inputs....................................................................................................35
Table 6- 5 Connection of analog output ........................................................................................................36
Table 6- 6 Connection of RS485 serial interface ..........................................................................................36
Table 6- 7 Settings of Siebert display S102..................................................................................................37
Table 6- 8 Activation of write protection ........................................................................................................38
Table 8- 1 Assignment of data record 3 ........................................................................................................62
Table 8- 2 Assignment of data record 4 ........................................................................................................79
Table 8- 3 Assignment of data record 5 ........................................................................................................80
Table 8- 4 Assignment of data record 6 ........................................................................................................82
Table 8- 5 Assignment of data record 7 ........................................................................................................86
Table 8- 6 Bit 0 defines digital output 0 (DQ 0).............................................................................................92
Table 8- 7 Bit 1 defines digital output 2 (DQ 2).............................................................................................92
Table 8- 8 Assignment of data record 8 ........................................................................................................95
Table 8- 9 Assignment of data record 9 ........................................................................................................95
Table 8- 10 Assignment of data record 10 ......................................................................................................96
Table 8- 11 Assignment of data record 12 ......................................................................................................98
Table 8- 12 Assignment of data record 13 ....................................................................................................100
Table 8- 13 Selection table for process value 1,2.........................................................................................103
Table 8- 14 Structure of status of analog output, digital outputs, and digital inputs .....................................104
Table 8- 15 Assignment of data record 15 ....................................................................................................104
Table 8- 16 Assignment of data record 16 ....................................................................................................105
Table 8- 17 Assignment of data record 17 ....................................................................................................106
Table 8- 18 Assignment of data record 18 ....................................................................................................107
Table 8- 19 Assignment of data record 20 ....................................................................................................109
Table 8- 20 Assignment of data record 21 ....................................................................................................110
Table 8- 21 Assignment of data record 22 ....................................................................................................111
Table 8- 22 Assignment of data record 23 ....................................................................................................118
Table 8- 23 Assignment of data record 24 ....................................................................................................121
Table 8- 24 Assignment of data record 25 ....................................................................................................126
Table 8- 25 Assignment of data record 28 ....................................................................................................132
Table 8- 26 Assignment of data record 29 ....................................................................................................133
Table 8- 27 Assignment of data record 30 ....................................................................................................136
Table 8- 28 Assignment of data record 31 ....................................................................................................141
Table 8- 29 Assignment of data record 32 ....................................................................................................146
Table 8- 30 Assignment of data record 34 ....................................................................................................150
Table 8- 31 Assignment of data record 35 ....................................................................................................151

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SIWAREX WP251
12 Manual, 12/2015, A5E37203357A
Table 8- 32 Assignment of data record 38 ....................................................................................................152
Table 8- 33 Assignment of data record 39 ....................................................................................................152
Table 8- 34 Assignment of data record 41 ....................................................................................................154
Table 8- 35 Assignment of data record 42 ....................................................................................................155
Table 8- 36 Assignment of data record 45 ....................................................................................................155
Table 8- 37 Assignment of data record 46 ....................................................................................................157
Table 8- 38 Assignment of data record 47 ....................................................................................................159
Table 8- 39 Assignment of data record 48 ....................................................................................................160
Table 9- 1 Technology messages ...............................................................................................................165
Table 9- 2 Data and command errors .........................................................................................................167
Table 10- 1 Service commands.....................................................................................................................180
Table 10- 2 Protocol commands, statistics, logbook.....................................................................................181
Table 10- 3 Trace commands .......................................................................................................................181
Table 10- 4 Display changeover for DR 34 and SecureDisplay....................................................................181
Table 10- 5 Scale commands........................................................................................................................183
Table 10- 6 Scale commands........................................................................................................................183
Table 10- 7 Command groups of the SIWAREX WP251..............................................................................184
Table 11- 1 Memory requirements of the function block ...............................................................................
185
Table 11- 2 Statuses/errors when working with the function block ...............................................................192
Table 11- 3 Command mailbox 1: Highest priority ........................................................................................195
Table 11- 4 Command mailbox 2: Average priority.......................................................................................195
Table 11- 5 Command mailbox 3: Low priority..............................................................................................195
Table 13- 1 Technical specifications: 24 V power supply .............................................................................203
Table 13- 2 Technical specifications: Power supply from SIMATIC S7 backplane bus................................203
Table 13- 3 Technical specifications: Analog load cell interface connection ................................................203
Table 13- 4 Technical specifications: ............................................................................................................204
Table 13- 5 Technical specifications: Digital outputs ....................................................................................205
Table 13- 6 Technical specifications: Digital inputs ......................................................................................205
Table 13- 7 Technical specifications: Real-time clock ..................................................................................206
Table 13- 8 Technical specifications: RS485 interface .................................................................................206
Table 13- 9 Technical specifications: Ethernet .............................................................................................206
Table 13- 10 Technical specifications: ............................................................................................................206
Table 13- 11 Technical specifications: Mechanical requirements and data....................................................207
Table 13- 12 Requirements: Electrical protection and safety requirements ...................................................207
Table 13- 13 Requirements: Interference emission in industrial area in accordance with EN 61000-6-4 ......208
Table 13- 14 Requirements: Interference immunity in industrial area in accordance with EN 61000-6-2......209

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SIWAREX WP251
Manual, 12/2015, A5E37203357A 13
Table 13- 15 Operating conditions in accordance with IEC 60721.................................................................210
Table 13- 16 Climatic requirements ................................................................................................................210
Images
Image 3-1 System overview..........................................................................................................................20
Image 4-1 SIWATOOL overview...................................................................................................................22
Image 4-2 SIWAREX WP251 in stand-alone operation................................................................................23
Image 6-1 SIWAREX WP251 connection areas ...........................................................................................29
Image 6-2 Shielding in the screw gland ........................................................................................................31
Image 6-3 Installation of the shield connection element (example)..............................................................32
Image 6-4 Connection of strain gauge load cell with 4-wire system.............................................................33
Image 6-5 Connection of strain gauge load cell with 6-wire system.............................................................34
Image 6-6 Connection of Siebert display S102.............................................................................................37
Image 6-7 Attachment of the calibration protection plates............................................................................39
Image 7-1 Mode switch .................................................................................................................................41
Image 7-2 Quick calibration with marked parameters...................................................................................43
Image 7-3 Sending/receiving a data record / in SIWATOOL V7...................................................................44
Image 7-4 Sending/receiving a data record / in SIWATOOL V7...................................................................47
Image 7-5 Layout of the SIWATOOL user interface .....................................................................................49
Image 7-6 Sending/receiving a data record in SIWATOOL V7.....................................................................50
Image 7-7 Trace export .................................................................................................................................53
Image 7-8 Downloading the firmware with SIWATOOL................................................................................55
Image 8-1 Standstill monitoring.....................................................................................................................72
Image 8-2 Step response of digital low pass filter at f = 2 Hz.......................................................................
74
Image 8-3 Calibration digits and calibration weight ......................................................................................77
Image 8-4 Linearizing the scales' characteristic curve..................................................................................78
Image 8-5 Limit value configuration ..............................................................................................................85
Image 8-6 Trailing weight ............................................................................................................................120
Image 8-7 Step response of digital low pass filter at f = 2 Hz.....................................................................125
Image 11-1 Configuring in the TIA Portal......................................................................................................186
Image 11-2 Configuring with S7....................................................................................................................186
Image 11-3 Start address of the module.......................................................................................................187
Image 11-4 Hardware identifier .....................................................................................................................187
Image 11-5 Block WP251PR.........................................................................................................................188

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SIWAREX WP251
14 Manual, 12/2015, A5E37203357A
Image 11-6 CMD command mailboxes .........................................................................................................189
Image 11-7 s_IO_DATA.................................................................................................................................191
Image 13-1 Current ranges for signal level according to Namur recommendation NE43 ............................205
Image A-1 Electrostatic voltages which an operator can be subjected to...................................................216

SIWAREX WP251
Manual, 12/2015, A5E37203357A 15
Introduction
1
1.1
Purpose of the manual
This manual contains all the information required for assembling installing, wiring and
commissioning the SIWAREX WP251 electronic weighing system.
1.2
Basic knowledge required
This manual requires basic knowledge of weighing technology. When used in the
SIMATIC S7-1200, basic knowledge of the SIMATIC S7-1200 automation system and the
TIA Portal are required.
1.3
Manual - range of validity
This manual is valid for:
Type designation
Order No.
as of version
SIWAREX WP251 7MH4960-6AA01 HW: FS 3 FW: V.1.0.0
Note
This manual contains a description of all electronic weighing systems available at the date of
publication. We reserve th
e right to include a Product Information with the latest information
on the module.
1.4
Technical support
Technical Support
You can contact Technical Support for weighing technology:
●E-mail (mailto:[e-mail])
●Phone: [phone]

Introduction
1.4 Technical support
SIWAREX WP251
16 Manual, 12/2015, A5E37203357A
You can contact Technical Support for S7-1200 products:
●Via the Internet using the
Support Request:
E-mail Weighing Technology (mailto:[e-mail])
●By phone: [phone]
●By fax: [phone]
Additional information about our technical support is available on the Internet at
Support request (http://www.siemens.de/automation/support-request)
Service & Support on the Internet
In addition to our documentation, we offer a comprehensive knowledge base online on the
Internet at:
Technical support (http://www.siemens.de/automation/csi/service)
There you will find:
●The latest product information, FAQs, downloads, tips and tricks.
●Our newsletter, providing you with the latest information about your products.
●A Knowledge Manager to find the right documents for you.
●Our bulletin board, where users and specialists share their knowledge worldwide.
●You can find your local contact partner for Industry Automation and Drives Technologies
in our partner database.
●Information about field service, repairs, spare parts and lots more under "Services".
Additional Support
Please contact your local Siemens representative and offices if you have any questions
about the products described in this manual and do not find the right answers.
Find your contact partner at:
Partner (http://www.automation.siemens.com/partner)
A signpost to the documentation of the various products and systems is available at:
Documentation
(https://support.industry.siemens.com/cs/products?dtp=Manual&pnid=17781&lc=en-WW)

SIWAREX WP251
Manual, 12/2015, A5E37203357A 17
Safety notes
2
2.1
General safety instructions
WARNING
Handling of the device/system by persons other than qualified personnel or ignoring the
warning instructions can result in severe injuries or damages. This means only qualified
personnel are permitted to handle this device/system.
WARNING
Commissioning is absolutely prohibited until it has been ensured that the machine in which
the component described here is to be installed fulfills the regulations/specifications of
Machinery Directive 89/392/EEC.
Note
The specifications o
f the manual for the SIMATIC S7-1200 system apply for configuration,
installation and commissioning in the SIMATIC environment. This section provides additional
information on hardware configuration, installation and preparation for operation of the
SIWARE
X WP251.
The safety notes must be observed.
Note
The device was developed, manufactured, tested and documented in compliance with the
relevant safety standards. The device does usually not pose any risks of material damage or
personal injury.
2.2
Security messages
Siemens provides automation and drive products with industrial security functions that
support the secure operation of plants or machines. They are an important component in a
holistic industrial security concept. With this in mind, our products undergo continuous
development. We therefore recommend that you keep yourself informed with respect to our
product updates. Detailed technical information can be found at:
(http://www.siemens.de/automation/).
To ensure the secure operation of a plant or machine it is also necessary to take suitable
preventive action (e.g. cell protection concept) and to integrate the automation and drive
components into a state-of-the-art holistic industrial security concept for the entire plant or

Safety notes
2.2 Security messages
SIWAREX WP251
18 Manual, 12/2015, A5E37203357A
machine. Products used from other manufacturers should also be taken into account here.
You will find further information under:
(http://www.siemens.de/industrialsecurity).

SIWAREX WP251
Manual, 12/2015, A5E37203357A 19
Description
3
3.1
Product overview
SIWAREX WP251 is a versatile and flexible weighing module that can be used for operation
as a non-automatic weighing instrument.
The electronic weighing system can be used in SIMATIC S7-1200 and uses all features of a
modern automation system, such as integrated communication, operator control and
monitoring, the diagnostic system as well as the configuration tools in the TIA Portal.
3.2
Area of application
SIWAREX WP251 is the optimum solution wherever fast and precise dosing and filling are
required. The typical applications of SIWAREX WP251 are:
●Automatic catchweighing instruments
●Gravimetric filling instruments (AWI)
●Non-automatic weighing instrument (NAWI)
●Weighing instruments in hazardous areas (with Ex interface SIWAREX IS)
3.3
System integration in SIMATIC
The electronic weighing system described here is a technology module for SIMATIC S7-
1200. The system, including the weighing application, can be configured as desired in the
automation solution. You can create optimal solutions for small and medium-sized plants by
combining the suitable SIMATIC modules. You can create customized or industry-specific
solutions in no time with the help of the configuration package available under the "Ready for
use" application for SIMATIC.
Note
The direct use of SIWAREX WP251 with fail
-safe SIMATIC S7-1200 controllers is not yet
supported.

Description
3.4 Scope of delivery
SIWAREX WP251
20 Manual, 12/2015, A5E37203357A
Image 3-1 System overview
3.4
Scope of delivery
The product package consists only of the SIWAREX WP251 weighing module.
Note
We recommend that you use the SIWAREX WP251 configuratio
n package for configuring
the SIWAREX
WP251 electronic weighing system. The configuration package is not included
in the product package of the module.