Siemens SIMATIC IM151-1 STANDARD User manual

SIMATIC ET 200S distributed I/O IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
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Preface
Properties
1
Parameters
2
Functions
3
Interrupt, error, and system
messages
4
Response times
5
SIMATIC
ET 200S distributed I/O
IM151-1 HIGH FEATURE interface
module (6ES7151-1BA02-0AB0)
Manual
03/2008
A5E01075975-02
The following supplement is part of this documentation:
No. Product Information Drawing number Edition
1 LED display of the configuration
and parameter assignment errors
A5E02478858-01 03/2009

Legal information
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DANGER
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WARNING
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CAUTION
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CAUTION
without a safety alert symbol, indicates that property damage can result if proper precautions are not taken.
NOTICE
indicates that an unintended result or situation can occur if the corresponding information is not taken into
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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 device/system may only be set up and used in conjunction with this documentation. Commissioning and
operation of a device/system may only be performed by qualified personnel. Within the context of the safety notes
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Note the following:
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We have reviewed the contents of this publication to ensure consistency with the hardware and software
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A5E01075975-02
Ⓟ 10/2008
Copyright © Siemens AG 2008.
Technical data subject to change

IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
Manual, 03/2008, A5E01075975-02 3
Preface
Preface
Purpose of the manual
This manual supplements the ET 200S Distributed I/O System Operating Instructions.
General functions for the ET 200S are described in the
ET 200S Distributed I/O System
Operating Instructions.
The information in this document along with the operating instructions enables you to
commission the ET 200S.
Basic knowledge requirements
To understand these operating instructions you should have general knowledge of
automation engineering.
Scope of the manual
This manual applies to this ET 200S module. It describes the components that are valid at
the time of publication.
Recycling and disposal
Thanks to the fact that it is low in contaminants, this ET 200S module is recyclable. For
environmentally compliant recycling and disposal of your electronic waste, please contact a
company certified for the disposal of electronic waste.
Additional support
If you have any questions relating to the products described in these operating instructions,
and do not find the answers in this document, please contact your local Siemens
representative.
http://www.siemens.com/automation/partner
The portal to our technical documentation for the various SIMATIC products and systems is
available at:
http://www.siemens.com/automation/simatic/portal
The online catalog and ordering system are available at:
http://www.siemens.com/automation/mall

Preface
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
4 Manual, 03/2008, A5E01075975-02
Training center
We offer courses to help you get started with the ET 200S and the SIMATIC S7 automation
system. Please contact your regional training center or the central training center in D -
90327, Nuremberg, Germany.
Phone: [phone].
http://www.siemens.com/sitrain
Technical Support
You can reach technical support for all A&D projects
● using the support request web form:
http://www.siemens.com/automation/support-request
● Phone: + 49 180 5050 222
● Fax: + 49 180 5050 223
For more information about our technical support, refer to our Web site at
http://www.siemens.de/automation/service
Service & Support on the Internet
In addition to our documentation services, you can also make use of our comprehensive
online knowledge base on the Internet.
http://www.siemens.com/automation/service&support
There you will find:
● Our Newsletter, which constantly provides you with the latest information about your
products.
● The right documentation for you using our Service & Support search engine.
● The bulletin board, a worldwide knowledge exchange for users and experts.
● Your local contact for Automation & Drives in our contact database.
● Information about on-site services, repairs, spare parts. Lots more can be found on our
"Services" pages.

IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
Manual, 03/2008, A5E01075975-02 5
Table of contents
Preface ...................................................................................................................................................... 3
1 Properties .................................................................................................................................................. 7
1.1 IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)..........................................7
2 Parameters.............................................................................................................................................. 13
2.1 Parameters for the IM151-1 HIGH FEATURE interface module .................................................13
2.2 Parameter description..................................................................................................................14
2.2.1 DP interrupt mode........................................................................................................................14
2.2.2 Bus length ....................................................................................................................................14
2.2.3 Enable startup for set <> actual configuration .............................................................................14
2.2.4 Option handling in general...........................................................................................................14
2.2.5 Option handling: Slot 2 to 63........................................................................................................15
2.2.6 Diagnostic interrupt ......................................................................................................................15
2.2.7 Process interrupt..........................................................................................................................15
2.2.8 Insert/remove-module interrupt....................................................................................................15
2.2.9 Analog-value format.....................................................................................................................15
2.2.10 Interference frequency suppression ............................................................................................16
2.2.11 Reference junction slot ................................................................................................................16
2.2.12 Reference junction input ..............................................................................................................16
2.2.13 Synchronize DP slave with equidistant DP cycle.........................................................................16
2.2.14 Time Ti (read in process values)..................................................................................................17
2.2.15 Time To (output process values) .................................................................................................17
3 Functions................................................................................................................................................. 19
3.1 Cycle synchronization ..................................................................................................................19
3.1.1 Basics...........................................................................................................................................19
3.1.2 Assigning the parameters for cycle Synchronization on the PROFIBUS DP ..............................22
3.1.3 Troubleshooting during isochronous mode on PROFIBUS DP...................................................25
3.2 Option handling with RESERVE modules ...................................................................................26
3.2.1 Principle of operation of option handling with RESERVE modules .............................................26
3.2.2 Prerequisites for option handling with RESERVE modules.........................................................27
3.2.3 Example for using RESERVE modules .......................................................................................28
3.2.4 Assigning parameters for option handling with RESERVE modules...........................................29
3.2.5 Controlling and monitoring options with RESERVE modules......................................................30
3.2.6 Troubleshooting for option handling with RESERVE modules....................................................32
3.2.7 Address area for option handling and status byte with RESERVE modules...............................32
3.3 Option handling without RESERVE modules ..............................................................................34
3.3.1 Principle of operation of option handling without RESERVE modules ........................................34
3.3.2 Prerequisites for option handling without RESERVE modules....................................................35
3.3.3 Example for use without RESERVE modules..............................................................................36
3.3.4 Configuring option handling without RESERVE modules............................................................37
3.3.5 Controlling and monitoring options without RESERVE modules.................................................38
3.4 Identification data.........................................................................................................................40

Table of contents
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
6 Manual, 03/2008, A5E01075975-02
4 Interrupt, error, and system messages .................................................................................................... 43
4.1 LED displays on the interface module ........................................................................................ 43
4.2 Diagnostic messages of the electronic modules......................................................................... 45
4.3 Diagnostics with STEP 7............................................................................................................. 45
4.3.1 Reading out diagnostics.............................................................................................................. 45
4.3.2 Structure of the slave diagnostics ............................................................................................... 47
4.3.3 Station statuses 1 to 3................................................................................................................. 48
4.3.4 Master PROFIBUS address........................................................................................................ 49
4.3.5 Identifier-related diagnostics ....................................................................................................... 50
4.3.6 Module status.............................................................................................................................. 51
4.3.7 Channel-specific diagnostics....................................................................................................... 52
4.3.8 H status ....................................................................................................................................... 53
4.3.9 Interrupts ..................................................................................................................................... 54
4.3.10 Incorrect module configurations of ET 200S on the PROFIBUS DP .......................................... 62
4.4 Evaluating the interrupts of the ET 200S .................................................................................... 62
5 Response times....................................................................................................................................... 65
5.1 Overview ..................................................................................................................................... 65
5.2 Response times for the ET 200S ................................................................................................ 65
5.3 Response time for digital input modules..................................................................................... 66
5.4 Response time for digital output modules...................................................................................67
5.5 Response time for analog input modules.................................................................................... 67
5.6 Reaction times of analog output modules................................................................................... 68
5.7 Response times for a 4 IQ-SENSE electronic module ............................................................... 69
5.8 Response times for technology modules.................................................................................... 69
Index........................................................................................................................................................ 71

IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
Manual, 03/2008, A5E01075975-02 7
Properties 1
1.1 IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
Properties
The IM151-1 HIGH FEATURE interface module has the following features:
● It connects the ET 200S with PROFIBUS DP via the RS 485 interface.
● There is no restriction on the SIMATIC S7 for the maximum parameter length. It is
normally 244 bits.
● The maximum address space is 244 bytes for inputs and 244 bytes for outputs.
● Operation as a DPV0 or DPV1 slave
● A maximum of 63 modules can be operated with the IM151-1 HIGH FEATURE.
● The maximum bus length at the backplane bus is 2 m.
● Supports option handling and the status byte for power modules.
● synchronizable with the DP cycle (cycle synchronization).
● The firmware can be updated via PROFIBUS DP using HW CONFIG.
● Safety-related I-slave-slave-communication via PROFIBUS DP. You can find the
description of this function in the
S7 Distributed Safety Configuration and Programming
manual.
● Identification data
● Direct data exchange
● Operation as DPV1 slave on the Y switching
● Use of fail-safe modules

Properties
1.1 IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
8 Manual, 03/2008, A5E01075975-02
Installation constraints
● For every 2DO 24 to 230 V AC electronic module used, the number of connectable I/O
modules in this station is reduced by one.
● The following modules cannot be used with the IM151-1 HIGH FEATURE:
Module Up to order number Up to product version
1COUNT 24V/100kHz 6ES7138-4DA02-0AB0 1
1COUNT 5V/500kHz 6ES7138-4DE00-0AB0 1
1SSI 6ES7138-4DB00-0AB0 3
1STEP 5V/204kHz 6ES7138-4DC00-0AB0 3
1SI serial interface module 6ES7138-4DF00-0AB0 1
Modbus/USS serial interface module 6ES7138-4DF01-0AB0 1
2AI U; HIGH FEATURE 6ES7134-4LB00-0AB0 1
2AI I 2/4DMU; HIGH FEATURE 6ES7134-4MB00-0AB0 1
2AO U; HIGH FEATURE 6ES7135-4LB00-0AB0 1
Terminal assignment
The following table shows the terminal assignment of the IM151-1 HIGH FEATURE interface
module for the 24 VDC voltage supply and PROFIBUS DP:
Table 1- 1 Terminal assignment of the IM151-1 HIGH FEATURE interface module
View Signal name Name
1- -
2- -
3 RxD/TxD-P Data line B
4 RTS Request To Send
5 M5V2 Data reference potential (station)
6 P5V2 Supply plus (station)
7- -
8 RxD/TxD-N Data line A
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

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


9

Properties
1.1 IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
Manual, 03/2008, A5E01075975-02 9
View Signal name Name
1L+ 24 VDC
2L+ 24 VDC (for loop through)
1M Chassis ground
Product version 1
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Product release 2 or later
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/ 0
2M Chassis ground (for loop through)
Block diagram
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Figure 1-1 Block diagram for the IM151-1 HIGH FEATURE interface module

Properties
1.1 IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
10 Manual, 03/2008, A5E01075975-02
Technical data for the IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
Dimensions and weight
Dimension B (mm) 45
Weight Approx. 150 g
Module-specific data
Data transmission rate 9.6; 19.2; 45.45; 93.75; 187.5; 500 kBaud, 1.5; 3;
6; 12 Mbit/s
Bus protocol PROFIBUS DP
Interface RS 485
SYNC capability yes
FREEZE capability yes
Manufacturer ID 80E0H
Direct data exchange yes
Cycle synchronization Yes, from 1.5 Mbits/s
Parameter length 27 bytes
56 bytes, if cycle synchronization is active
Address space 244 bytes I/O
Option handling
•With reserve module yes
•Without reserve module yes
I&M data yes
Firmware update via PROFIBUS DP with HW Config
Max. output current of the PROFIBUS DP
interface (5, 6)
80 mA
Voltages, currents, potentials
Rated supply voltage of the electronics (1L+) 24 VDC
•Incorrect polarity protection yes
•Power failure bypass Min. 20 ms
Galvanic isolation
•Between the backplane bus and electronic
components No
•Between the PROFIBUS DP and electronic
components yes
•Between the supply voltage and electronic
components No
Permitted potential difference (to the rail) 75 VDC / 60 VAC
Insulation test voltage 500 VDC
Current consumption from rated supply voltage
(1L+)
Approx. 200 mA
Power dissipation of the module Typically 3.3 W

Properties
1.1 IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
Manual, 03/2008, A5E01075975-02 11
Status, interrupts, diagnostics
Interrupts yes
Diagnostic function yes
•Group error Red "SF" LED
•PROFIBUS DP bus monitoring Red "BF" LED
•Monitoring of the power supply voltage of the
electronics Green "ON" LED
Updating the firmware for IM151-1 HIGH FEATURE
The IM151-1 HIGH FEATURE firmware can be updated using STEP 7 V5.1, SP 3 or higher.
To update the firmware, you receive the *.UPD files containing the current firmware.
Requirements:
● The IM151-1 HIGH FEATURE in the station whose firmware is to be updated must be
accessible online.
● The files with the current firmware version must be available in the file system of your
programming device or PC.
Information regarding the method of procedure can be found in the
STEP 7 online help.
Note
Make sure to use the correct firmware version for the interface module in use during the
update process. An interface module with an older order number cannot be updated with the
firmware version for an interface module with a more recent order number and vise versa.
Configuration with more than 244 bytes of parameter data
For configurations with STEP 7 V5.3 SP 3 and higher, it is possible to operate the IM151-1
HIGH FEATURE from 6ES7151-1BA01-0AB0 in DPV1 mode with more than 244 bytes of
parameter data.
A configuration based on the GSD file does not offer this possibility.
Note
If the parameter length is greater than 244 bytes, an increase in the station startup time is to
be expected.

Properties
1.1 IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
12 Manual, 03/2008, A5E01075975-02

IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
Manual, 03/2008, A5E01075975-02 13
Parameters 2
2.1 Parameters for the IM151-1 HIGH FEATURE interface module
Table 2- 1 Parameters for the IM151-1 HIGH FEATURE interface module
IM151-1 HIGH FEATURE Value range Default setting 5 Applicability
DP interrupt mode DPV0/DPV1 DPV0 ET 200S
Bus length ≤ 1 m / > 1 m ≤ 1 m ET 200S
Operation at set <> actual
configuration 1
disable/enable disable ET 200S
Diagnostic interrupt 3 disable/enable disable ET 200S
Process interrupt 3 disable/enable disable ET 200S
Remove/insert module
interrupt 2 3
disable/enable disable ET 200S
Identifier-related diagnostics disable/enable enable ET 200S
Module status disable/enable enable ET 200S
Channel-specific diagnostics disable/enable enable ET 200S
Option handling in general disable/enable disable ET 200S
Option handling With/without reserve
module
With reserve
module
Module
Option handling:
Slots 2 to 63
disable/enable disable Module
Analog-value format 4 SIMATIC
S7/SIMATIC S5
S7 ET 200S
Interference frequency
suppression
50 Hz/60 Hz 50 Hz ET 200S
Reference junction slot None /2 to 63 None ET 200S
Reference junction input RTD on channel 0/
RTD on channel 1
0 ET 200S
Synchronize DP slave with DP
cycle
disable/enable disable ET 200S
Time Ti
(read process values)
Minimum/Maximum Standard value ET 200S
Time To
(output process values)
Minimum/Maximum Standard value ET 200S
1 See also the "option handling" parameter.
2 The default setting of the parameter in the GSD file is "disable".
3 Only parameterizable in DPV1 operation.
4 The parameter only exists when configuring using the GSD file.
5 The default settings apply to the default start-up (if no other parameters have been assigned by the
DP master).

Parameters
2.2 Parameter description
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
14 Manual, 03/2008, A5E01075975-02
2.2 Parameter description
2.2.1 DP interrupt mode
This parameter can be used to enable or disable ET 200S DPV1 operation. Data records
and interrupts (can be assigned parameters) are supported by class 1 and class 2 services
after DPV1 operation is enabled.
Requirements:
● The DP master must also support DPV1.
2.2.2 Bus length
≤ 1 m: The default setting for the maximum bus length is 1 m.
> 1 m: The bus length of the ET 200S is > 1 m and can be a maximum 2 m. This setting will
increase the response time of the ET 200S.
2.2.3 Enable startup for set <> actual configuration
When this parameter is enabled, and
● Modules removed and inserted during operation will not lead to a ET 200S station failure.
● The actual configuration differs from the expected configuration, the ET 200S remains
engaged in data transfer with the DP master.
When this parameter is disabled, and
● Modules removed and inserted during operation will lead to an ET 200S station failure.
● The actual configuration differs from the expected configuration, there is no data transfer
between the DP master and the ET 200S.
Exception: option handling with RESERVE modules.
2.2.4 Option handling in general
These parameters can be used enable or disable the option handling for the entire ET 200S.
See also
Assigning parameters for option handling with RESERVE modules (Page 29)
Configuring option handling without RESERVE modules (Page 37)

Parameters
2.2 Parameter description
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
Manual, 03/2008, A5E01075975-02 15
2.2.5 Option handling: Slot 2 to 63
This parameter can be used to enable or disable checking the configuration.
● Slots 2 to 63 are enabled: Instead of the configured electronic module you can also insert
a RESERVE module in the relevant slot without diagnostics being reported.
● Slots 2 to 63 are disabled: Only the configured module can be located on the relevant
slot. RESERVE modules are treated as incorrect modules. Depending on the setting of
the parameter "Operation at Preset <> Actual Configuration" the ET 200S will either
terminate or continue exchanging data.
2.2.6 Diagnostic interrupt
This parameter can be used to enable or disable diagnostic interrupts. Diagnostic interrupts
are supported
● on PROFIBUS DP, if the ET 200S is in DPV1 mode.
● and on PROFINET IO.
2.2.7 Process interrupt
This parameter can be used to enable or disable process interrupts. Process interrupts are
supported:
● On PROFIBUS DP, if the ET 200S is in DPV1 mode.
● On PROFINET IO.
2.2.8 Insert/remove-module interrupt
This parameter can be used to enable or disable remove/insert module interrupts.
Remove/insert module interrupts are supported
● On PROFIBUS DP, if the ET 200S is in DPV1 mode
● On PROFINET IO.
2.2.9 Analog-value format
You set the number format for all analog electronic modules here.

Parameters
2.2 Parameter description
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
16 Manual, 03/2008, A5E01075975-02
2.2.10 Interference frequency suppression
The frequency of your AC power system can interfere with the measured value especially
when measuring in low voltage ranges and using thermocouple elements. Enter the line
frequency for your system here (50 Hz or 60 Hz).
The interference frequency suppression parameter applies to all analog electronic modules.
This parameter is also used to specify the integration and conversion time of the various
modules. See the technical data for the analog electronic modules.
2.2.11 Reference junction slot
This parameter allows you to assign a slot (none, 2 to 63) with a channel for measuring the
reference temperature (calculation of the compensation value).
Reference
For information on connecting thermocouples, refer to the manuals for the analog electronic
modules.
2.2.12 Reference junction input
This parameter can be used to set the channel (0/1) for measuring the reference
temperature (calculation of the compensation value) for the assigned slot.
Reference
For information on connecting thermocouples, refer to the manuals for the analog electronic
modules
.
2.2.13 Synchronize DP slave with equidistant DP cycle.
This parameter can be used to enable or disable cycle synchronization.
After enabling cycle synchronization the ET 200S I/O are synchronized with the global
control frame of the master (as equidistance cycle).

Parameters
2.2 Parameter description
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
Manual, 03/2008, A5E01075975-02 17
2.2.14 Time Ti (read in process values)
This value can only be set if you have enabled the "Synchronize DP slave to DP cycle"
parameter.
Ti is the time reserved for reading in the input data at the ET 200S. At the beginning of Ti,
the input data is converted at the terminals and stored in a buffer via the backplane bus of
the ET 200S. Ti ends at the beginning of the next equidistant DP cycle i.e., with the global
control frame.
At this point the most recent and up-to-date input data must be available for read in on the
PROFIBUS subnet. The Ti time must consider the processing and delay times in the ET
200S modules and backplane bus and is therefore dependent on the configuration with
regard to modular slaves.
The Ti time can only be set between the minimum and maximum values within the specified
grid. Normally, the default values should be accepted.
2.2.15 Time To (output process values)
This value can only be set if you have enabled the "Synchronize DP slave to DP cycle"
parameter.
This value can only be set provided you have enabled the "Synchronize DP slave with DP
cycle" parameter. The time To includes the following:
● Distribution of the output data via the PROFIBUS DP bus system to the slaves (= cyclic
data-exchange master slave)
● Distribution of the output data to the modules via the backplane bus of the slave
● Conversion and transfer of the output data to the output terminals of the module
To starts with the arrival of the global control frame. As with Ti, the time can be set between
the minimum and maximum values within the specified grid. Normally, you should accept the
default values.

Parameters
2.2 Parameter description
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
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IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
Manual, 03/2008, A5E01075975-02 19
Functions 3
3.1 Cycle synchronization
3.1.1 Basics
Properties
Reproducible response times (i.e., of equal length) are achieved in SIMATIC with a constant
DP bus cycle, synchronization of the user program on the DP bus cycle, and the isochronous
transfer of I/O data to the I/O modules. The isochronous sections of the user program are
processed synchronously with the DP bus cycle by means of synchronous cycle interrupts
(OB 61 to OB 64). The I/O data are transferred at defined and constant (isochronous)
intervals via the backplane bus of the DP slave to the I/O modules and switched through
isochronously up to the "terminal".
In other words, isochronous operation results in the synchronization of all hitherto free-
running single cycles. These include the user program in the CPU, the DP cycle on the
PROFIBUS subnet and the cycle in the DP slave right up to the cycle in the I/O modules of
the DP slaves.
The maximum jitter for the IM151-1 is 10 µs. The jitter of the ET 200S I/O modules cannot be
considered due to the existing diversity.
Requirements
● Cycle synchronization is possible with the IM151-1 HIGH FEATURE with modules which
support cycle synchronization. You can see whether a module supports cycle
synchronization in the device description or HW Config. Other modules can be used in
the ET 200S setup, but they do not support cycle synchronization.
● The transmission rate of the PROFIBUS DP is at least 1.5 Mbps (shorter equidistance
times can be achieved with higher transmission rates).
● The maximum constant bus cycle time is 32 ms.
● The constant bus cycle time master (class 1) must be a class 1 DP master. This means a
programming device/PC cannot be a constant bus cycle time master.
● Only one DP master (class 1) may be active on the PROFIBUS DP during equidistant
mode. Programming devices or PCs (class 2) can also be connected.
● The isochronous mode can only be activated on the ET 200S if the constant bus cycle is
enabled on the DP master system.
● Isochronous operation (constant bus cycle time) of the ET 200S is not possible during
removal or insertion of electronic modules.
In order to ensure that asynchronous results such as "Switch on power module" or
"Read/Write data record" do not cause cycle violation, a sufficiently large gap between To
and Ti must be provided, i.e. Tdp must be increased.

Functions
3.1 Cycle synchronization
IM151-1 HIGH FEATURE interface module (6ES7151-1BA02-0AB0)
20 Manual, 03/2008, A5E01075975-02
● In constant bus cycle time operation, the ET 200S requires a starting time of approx. 150
DP cycles to guarantee isochronous operation up to the terminals.
● The bus length must be less than 1 meter.
Note
Isochronous operation is only possible without interference frequency suppression and
without smoothing.
Optimizing the constant bus cycle time
● Ensure equal input delay of all the digital input modules in the ET 200S station for cycle
synchronization.
If the settings differ, the lowest input delay is used to calculate the DP cycle time.
Changes at the inputs of modules with a higher input delay are recorded with a
corresponding time offset.
This also applies to the digital output modules. Choose modules with the same
conversion time TWA here.
● The shorter the input delays you set for the HIGH FEATURE digital input modules, the
shorter the constant bus cycle times that can be achieved.
Hint: Set an input delay as close to 0.1 ms as possible for the HIGH FEATURE digital
input modules.
● The processing time of the modules should be taken into account in the case of modules
that support isochronous operation.
● The minimum constant bus cycle time depends on the number of modules in the ET
200S.
Hint: Always try to use 4-channel digital input HIGH FEATURE modules to reduce the
number of modules required.
Shorter constant bus cycle times can be achieved by distributing the modules of an ET
200S (with a high module count) over two ET 200S stations.
● The constant bus cycle time is reduced if you increase the transmission rate.
Hint: Set the highest possible baud rate.
● Interface module 151-1 HIGH FEATURE, 6ES7151-1BA02-0AB0 and higher: An
optimization of the periods for the constant bus cycle can be achieved through the correct
plugging sequence of the electronic modules:
– Plug the output modules with the longest processing time on the left in the ET 200S.
– Plug the input modules with the longest processing time on the right in the ET 200S.
The processing times (= TWE or TWA) can be found in the technical data for the module
concerned.