Siemens SIMATIC S7 User guide

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SIMATIC
S7
S7-200 SMART
System Manual
V2.3, 07/2017
A5E03822230
-AF
Preface
Product overview
1
Getting started
2
Installation
3
PLC concepts
4
Programming concepts
5
PLC device configuration
6
Program instructions
7
Communication
8
Libraries
9
Debugging and
troubleshooting
10
PID loops and tuning
11
Open loop motion control
12
Technical specifications
A
Calculating a power budget
B
Error codes
C
Special memory (SM) and
system symbol names
D
References
E
Ordering information
F

Siemens AG
Division Digital Factory
Postfach 48 48
90026 NÜRNBERG
GERMANY
A5E03822230-AF
Ⓟ
06/2017 Subject to change
Copyright © Siemens AG 2017.
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.

S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF 3
Preface
Purpose of the manual
The S7-200 SMART series is a line of micro-programmable logic controllers (Micro PLCs)
that can control a variety of automation applications. Compact design, low cost, and a
powerful instruction set make the S7-200 SMART a perfect solution for controlling small
applications. The wide variety of S7-200 SMART models and the Windows-based
programming tool give you the flexibility you need to solve your automation problems.
This manual provides information about installing and programming the S7-200 SMART
CPUs and is designed for engineers, programmers, installers, and electricians who have a
general knowledge of programmable logic controllers.
Required basic knowledge
To understand this manual, it is necessary to have a general knowledge of automation and
programmable logic controllers.
Scope of the manual
This manual describes the following products:
●STEP 7-Micro/WIN SMART V2.3
●S7-200 SMART CPU firmware release V2.3
For a complete list of the S7-200 SMART products and article numbers described in this
manual, see Technical Specifications (Page 679).
Certification, CE label and other standards
Refer to the technical specifications for more information.
Service and support
In addition to our documentation, we offer our technical expertise on the Internet on the
customer support web site (http://www.siemens.com/automation/).
Contact your Siemens distributor or sales office for assistance in answering any technical
questions, for training, or for ordering S7 products. Because your sales representatives are
technically trained and have the most specific knowledge about your operations, process
and industry, as well as about the individual Siemens products that you are using, they can
provide the fastest and most efficient answers to any problems you might encounter.

Preface
S7-200 SMART
4System Manual, V2.3, 07/2017, A5E03822230-AF
Security information
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is
necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial
security concept. Siemens’ products and solutions only form one element of such a concept.
Customer is responsible to prevent unauthorized access to its plants, systems, machines
and networks. Systems, machines and components should only be connected to the
enterprise network or the internet if and to the extent necessary and with appropriate security
measures (e.g. use of firewalls and network segmentation) in place.
Additionally, Siemens’ guidance on appropriate security measures should be taken into
account. For more information about industrial security, please visit
(http://www.siemens.com/industrialsecurity).
Siemens’ products and solutions undergo continuous development to make them more
secure. Siemens strongly recommends to apply product updates as soon as available and to
always use the latest product versions. Use of product versions that are no longer supported,
and failure to apply latest updates may increase customer’s exposure to cyber threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed under (http://www.siemens.com/industrialsecurity).

S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF 5
Table of contents
Preface ................................................................................................................................................... 3
1 Product overview .................................................................................................................................. 17
1.1 S7-200 SMART CPU ..............................................................................................................18
1.2 New features...........................................................................................................................21
1.3 CPU feature differences..........................................................................................................23
1.4 S7-200 SMART expansion modules.......................................................................................26
1.5 HMI devices for S7-200 SMART.............................................................................................27
1.6 Communications options ........................................................................................................28
1.7 Programming software............................................................................................................29
2 Getting started ...................................................................................................................................... 31
2.1 Connecting to the CPU ...........................................................................................................31
2.1.1 Configuring the CPU for communication ................................................................................32
2.1.1.1 Overview .................................................................................................................................32
2.1.1.2 Establishing the Ethernet hardware communication connection............................................33
2.1.1.3 Setting up Ethernet communication with the CPU..................................................................34
2.1.1.4 Establishing the RS485 hardware communication connection...............................................36
2.1.1.5 Setting up RS485 communication with the CPU ....................................................................37
2.2 Creating the sample program .................................................................................................39
2.2.1 Network 1: Starting the timer ..................................................................................................40
2.2.2 Network 2: Turning the output on ...........................................................................................41
2.2.3 Network 3: Resetting the timer ...............................................................................................42
2.2.4 Setting the CPU type and version for your project .................................................................43
2.2.5 Saving the sample project ......................................................................................................44
2.3 Downloading the sample program ..........................................................................................45
2.4 Changing the operating mode of the CPU..............................................................................46
3 Installation ............................................................................................................................................ 47
3.1 Guidelines for installing S7-200 SMART devices ...................................................................47
3.2 Power budget..........................................................................................................................49
3.3 Installation and removal procedures.......................................................................................51
3.3.1 Mounting dimensions for the S7-200 SMART devices ...........................................................51
3.3.2 Installing and removing the CPU ............................................................................................52
3.3.3 Installing and removing a signal board or battery board.........................................................55
3.3.4 Removing and reinstalling the terminal block connector ........................................................57
3.3.5 Installing and removing an expansion module .......................................................................58
3.3.6 Installing and removing the expansion cable..........................................................................60
3.4 Wiring guidelines.....................................................................................................................62

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S7-200 SMART
6System Manual, V2.3, 07/2017, A5E03822230-AF
4 PLC concepts ....................................................................................................................................... 69
4.1 Execution of the control logic ................................................................................................. 69
4.1.1 Reading the inputs and writing to the outputs........................................................................ 71
4.1.2 Immediately reading or writing the I/O ................................................................................... 71
4.1.3 Executing the user program................................................................................................... 72
4.2 Accessing data....................................................................................................................... 74
4.2.1 Accessing memory areas....................................................................................................... 75
4.2.2 Format for Real numbers ....................................................................................................... 82
4.2.3 Format for strings ................................................................................................................... 82
4.2.4 Assigning a constant value for instructions............................................................................ 83
4.2.5 Addressing the local and expansion I/O ................................................................................ 83
4.2.6 Using pointers for indirect addressing.................................................................................... 84
4.2.7 Pointer examples ................................................................................................................... 87
4.3 Saving and restoring data ...................................................................................................... 89
4.3.1 Downloading project components.......................................................................................... 89
4.3.2 Uploading project components .............................................................................................. 92
4.3.3 Types of storage .................................................................................................................... 93
4.3.4 Using a memory card............................................................................................................. 94
4.3.5 Inserting a memory card in a standard CPU.......................................................................... 96
4.3.6 Transferring your program with a memory card..................................................................... 97
4.3.7 Restoring data after power on................................................................................................ 99
4.4 Changing the operating mode of the CPU........................................................................... 100
4.5 Status LEDs ......................................................................................................................... 101
5 Programming concepts ........................................................................................................................103
5.1 Guidelines for designing a PLC system............................................................................... 103
5.2 Elements of the user program.............................................................................................. 105
5.3 Creating your user program ................................................................................................. 108
5.3.1 Earlier versions of STEP 7-Micro/WIN projects ................................................................... 108
5.3.2 Using STEP 7-Micro/WIN SMART user interface................................................................ 110
5.3.3 Using STEP 7-Micro/WIN SMART to create your programs ............................................... 111
5.3.4 Using wizards to help you create your control program....................................................... 112
5.3.5 Features of the LAD editor................................................................................................... 113
5.3.6 Features of the FBD editor................................................................................................... 114
5.3.7 Features of the STL editor ................................................................................................... 114
5.4 Data block (DB) editor.......................................................................................................... 115
5.5 Symbol table ........................................................................................................................ 118
5.6 Variable table ....................................................................................................................... 121
5.7 PLC error reaction................................................................................................................ 127
5.7.1 Non-fatal errors and I/O errors............................................................................................. 128
5.7.2 Fatal errors........................................................................................................................... 129
5.8 Program edit in RUN mode.................................................................................................. 130
5.9 Features for debugging your program ................................................................................. 132

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6 PLC device configuration .................................................................................................................... 133
6.1 Configuring the operation of the PLC system.......................................................................133
6.1.1 System block.........................................................................................................................133
6.1.2 Configuring communication ..................................................................................................135
6.1.3 Configuring the digital inputs ................................................................................................138
6.1.4 Configuring the digital outputs ..............................................................................................140
6.1.5 Configuring the retentive ranges...........................................................................................141
6.1.6 Configuring system security..................................................................................................143
6.1.7 Configuring the startup options.............................................................................................147
6.1.8 Configuring the analog inputs ...............................................................................................148
6.1.9 Reference to the analog inputs technical specifications.......................................................150
6.1.10 Configuring the analog outputs.............................................................................................151
6.1.11 Reference to the analog outputs technical specifications.....................................................152
6.1.12 Configuring the RTD analog inputs.......................................................................................153
6.1.13 Configuring the TC analog inputs .........................................................................................158
6.1.14 Configuring the RS485/RS232 CM01 communications signal board...................................162
6.1.15 Configuring the BA01 battery signal board...........................................................................163
6.1.16 Clearing PLC memory...........................................................................................................164
6.1.17 Creating a reset-to-factory-defaults memory card ................................................................167
6.2 High-speed I/O......................................................................................................................168
7 Program instructions ........................................................................................................................... 169
7.1 Bit logic .................................................................................................................................169
7.1.1 Standard inputs.....................................................................................................................169
7.1.2 Immediate inputs...................................................................................................................171
7.1.3 Logic stack overview.............................................................................................................172
7.1.4 STL logic stack instructions ..................................................................................................174
7.1.5 NOT.......................................................................................................................................176
7.1.6 Positive and negative transition detectors ............................................................................177
7.1.7 Coils: output and output immediate instructions...................................................................178
7.1.8 Set, reset, set immediate, and reset immediate functions....................................................179
7.1.9 Set and reset dominant bistable ...........................................................................................180
7.1.10 NOP (No operation) instruction.............................................................................................181
7.1.11 Bit logic input examples ........................................................................................................182
7.1.12 Bit logic output examples......................................................................................................183
7.2 Clock .....................................................................................................................................185
7.2.1 Read and set real-time clock ................................................................................................185
7.2.2 Read and set real-time clock extended ................................................................................187
7.3 Communication .....................................................................................................................191
7.3.1 GET and PUT (Ethernet) ......................................................................................................191
7.3.2 Transmit and receive (Freeport on RS485/RS232) ..............................................................199
7.3.3 Get port address and set port address (PPI protocol on RS485/RS232).............................213
7.3.4 Get IP address and set IP address (Ethernet)......................................................................214
7.3.5 Open user communication....................................................................................................217
7.3.5.1 OUC instructions...................................................................................................................217
7.3.5.2 OUC instruction error codes .................................................................................................228
7.4 Compare ...............................................................................................................................230
7.4.1 Compare number values ......................................................................................................230
7.4.2 Compare character strings ...................................................................................................234

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7.5 Convert................................................................................................................................. 236
7.5.1 Standard conversion instructions......................................................................................... 236
7.5.2 ASCII character array conversion ........................................................................................ 240
7.5.3 Number value to ASCII string conversion............................................................................ 245
7.5.4 ASCII sub-string to number value conversion ..................................................................... 249
7.5.5 Encode and decode ............................................................................................................. 252
7.6 Counters............................................................................................................................... 253
7.6.1 Counter instructions ............................................................................................................. 253
7.6.2 High-speed counter instructions .......................................................................................... 257
7.6.3 High-speed counter summary.............................................................................................. 260
7.6.4 Noise reduction for high-speed inputs ................................................................................. 261
7.6.5 High-speed counter programming ....................................................................................... 264
7.6.6 Example initialization sequences for high-speed counters.................................................. 277
7.7 Pulse output ......................................................................................................................... 285
7.7.1 Pulse output instruction (PLS) ............................................................................................. 285
7.7.2 Pulse train output (PTO) ...................................................................................................... 287
7.7.3 Pulse width modulation (PWM)............................................................................................ 289
7.7.4 Using SM locations to configure and control the PTO/PWM operation............................... 290
7.7.5 Calculating the profile table values ...................................................................................... 294
7.8 Math ..................................................................................................................................... 297
7.8.1 Add, subtract, multiply, and divide ....................................................................................... 297
7.8.2 Multiply integer to double integer and divide integer with remainder................................... 300
7.8.3 Trigonometry, natural logarithm/exponential, and square root ............................................ 302
7.8.4 Increment and decrement .................................................................................................... 305
7.9 PID ....................................................................................................................................... 307
7.9.1 Using the PID wizard ........................................................................................................... 308
7.9.2 PID algorithm ....................................................................................................................... 313
7.9.3 Converting and normalizing the loop inputs......................................................................... 317
7.9.4 Converting the loop output to a scaled integer value........................................................... 318
7.9.5 Forward- or reverse-acting loops ......................................................................................... 319
7.10 Interrupt................................................................................................................................ 322
7.10.1 Interrupt instructions ............................................................................................................ 322
7.10.2 Interrupt routine overview and CPU model event support................................................... 324
7.10.3 Interrupt programming guidelines ........................................................................................ 326
7.10.4 Types of interrupt events that the S7-200 SMART CPU supports ...................................... 328
7.10.5 Interrupt priority, queuing, and example program................................................................ 330
7.11 Logical operations................................................................................................................ 335
7.11.1 Invert .................................................................................................................................... 335
7.11.2 AND, OR, and exclusive OR................................................................................................ 336
7.12 Move .................................................................................................................................... 338
7.12.1 Move byte, word, double word, or real................................................................................. 338
7.12.2 Block move........................................................................................................................... 339
7.12.3 Swap bytes........................................................................................................................... 340
7.12.4 Move byte immediate (read and write) ................................................................................ 341
7.13 Program control.................................................................................................................... 342
7.13.1 FOR-NEXT loop................................................................................................................... 342
7.13.2 JMP (jump to label) .............................................................................................................. 344
7.13.3 SCR (sequence control relay).............................................................................................. 345

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7.13.4 END, STOP, and WDR (watchdog timer reset)....................................................................354
7.13.5 GET_ERROR (Get non-fatal error code)..............................................................................356
7.14 Shift and rotate......................................................................................................................357
7.14.1 Shift and rotate......................................................................................................................357
7.14.2 Shift register bit .....................................................................................................................360
7.15 String.....................................................................................................................................362
7.15.1 String (Get length, copy, and concatenate) ..........................................................................362
7.15.2 Copy substring from string....................................................................................................364
7.15.3 Find string and first character within string ...........................................................................365
7.16 Table .....................................................................................................................................368
7.16.1 Add to table...........................................................................................................................368
7.16.2 First-in-first-out and last-in-first-out.......................................................................................370
7.16.3 Memory fill.............................................................................................................................372
7.16.4 Table find ..............................................................................................................................373
7.17 Timer.....................................................................................................................................377
7.17.1 Timer instructions..................................................................................................................377
7.17.2 Timer programming tips and examples ................................................................................380
7.17.3 Interval timers .......................................................................................................................386
7.18 Subroutine.............................................................................................................................388
7.18.1 CALL (subroutine) and RET (conditional return) ..................................................................388
8 Communication................................................................................................................................... 395
8.1 CPU communication connections.........................................................................................396
8.2 CPU communication ports ....................................................................................................397
8.3 HMIs and communication drivers .........................................................................................398
8.4 Ethernet ................................................................................................................................400
8.4.1 Overview ...............................................................................................................................400
8.4.2 Local/partner connection ......................................................................................................400
8.4.3 Sample Ethernet network configurations ..............................................................................401
8.4.4 Assigning Internet Protocol (IP) addresses ..........................................................................402
8.4.4.1 Assigning IP addresses to programming and network devices ............................................402
8.4.4.2 Configuring or changing an IP address for a CPU or device in your project ........................404
8.4.4.3 Searching for CPUs and devices on your Ethernet network ................................................412
8.4.5 Locating the Ethernet (MAC) address on the CPU...............................................................413
8.4.6 HMI-to-CPU communication .................................................................................................415
8.4.7 Open user communication....................................................................................................417
8.4.7.1 Protocols ...............................................................................................................................417
8.4.7.2 Connections ..........................................................................................................................418
8.4.7.3 Ports and TSAPs ..................................................................................................................419
8.5 PROFIBUS............................................................................................................................421
8.5.1 EM DP01 PROFIBUS DP module ........................................................................................423
8.5.1.1 Distributed Peripheral (DP) standard communications.........................................................423
8.5.1.2 Using the EM DP01 to connect an S7-200 SMART as a DP device....................................424
8.5.1.3 Configuring the EM DP01 .....................................................................................................426
8.5.1.4 Data consistency...................................................................................................................427
8.5.1.5 Supported configurations......................................................................................................428
8.5.1.6 Installing the EM DP01 GSD file...........................................................................................429
8.5.1.7 Configuring the EM DP01 I/O ...............................................................................................431

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8.5.1.8 Example of V memory and I/O address area....................................................................... 433
8.5.1.9 User program considerations............................................................................................... 435
8.5.1.10 LED status indicators for the EM DP01 PROFIBUS DP...................................................... 437
8.5.1.11 Using HMIs and S7-CPUs with the EM DP01 ..................................................................... 439
8.5.1.12 Device database file: GSD................................................................................................... 440
8.5.1.13 PROFIBUS DP communications to a CPU example program............................................. 444
8.5.1.14 Reference to the EM DP01 PROFIBUS DP module technical specifications ..................... 446
8.6 RS485 .................................................................................................................................. 446
8.6.1 PPI protocol.......................................................................................................................... 447
8.6.2 Baud rate and network address........................................................................................... 448
8.6.2.1 Definition of baud rate and network address ....................................................................... 448
8.6.2.2 Setting the baud rate and network address for the S7-200 SMART CPU........................... 449
8.6.3 Sample RS485 network configurations................................................................................ 451
8.6.3.1 Single-master PPI networks................................................................................................. 451
8.6.3.2 Multi-master and multi-slave PPI networks.......................................................................... 451
8.6.4 Assigning RS485 addresses................................................................................................ 452
8.6.4.1 Configuring or changing an RS485 address for a CPU or device in your project ............... 452
8.6.4.2 Searching for CPUs and devices on your RS485 network .................................................. 457
8.6.5 Building your network........................................................................................................... 458
8.6.5.1 General guidelines ............................................................................................................... 458
8.6.5.2 Determining the distances, transmission rates, and cable lengths for your network........... 459
8.6.5.3 Repeaters on the network.................................................................................................... 459
8.6.5.4 Specifications for RS485 cable ............................................................................................ 460
8.6.5.5 Connector pin assignments ................................................................................................. 460
8.6.5.6 Biasing and terminating the network cable .......................................................................... 462
8.6.5.7 Biasing and terminating the CM01 signal board .................................................................. 463
8.6.5.8 Using HMI devices on your RS485 network ........................................................................ 464
8.6.6 Freeport mode...................................................................................................................... 465
8.6.6.1 Creating user-defined protocols with Freeport mode........................................................... 465
8.6.6.2 Using the RS232/PPI Multi-Master cable and Freeport mode with RS232 devices............ 468
8.7 RS232 .................................................................................................................................. 470
9 Libraries...............................................................................................................................................471
9.1 Library types (Siemens and user-defined)........................................................................... 471
9.2 Overview of Modbus communication................................................................................... 473
9.2.1 Modbus addressing.............................................................................................................. 473
9.2.2 Modbus read and write functions......................................................................................... 475
9.3 Modbus RTU library ............................................................................................................. 476
9.3.1 Modbus communication overview........................................................................................ 476
9.3.1.1 Modbus RTU library features ............................................................................................... 476
9.3.1.2 Requirements for using Modbus instructions....................................................................... 477
9.3.1.3 Initialization and execution time for Modbus protocol .......................................................... 478
9.3.2 Modbus RTU master............................................................................................................ 479
9.3.2.1 Using the Modbus RTU master instructions ........................................................................ 479
9.3.2.2 MBUS_CTRL / MB_CTRL2 instruction (initialize master).................................................... 481
9.3.2.3 MBUS_MSG / MB_MSG2 instruction................................................................................... 483
9.3.2.4 Modbus RTU master execution error codes ........................................................................ 487
9.3.3 Modbus RTU slave .............................................................................................................. 489
9.3.3.1 Using the Modbus RTU slave instructions........................................................................... 489
9.3.3.2 MBUS_INIT instruction (initialize slave)............................................................................... 491