Siemens SIMATIC S7-200 User guide

Preface, Contents
Product Overview 1
Getting Started 2
Installing the S7-200 3
PLC Concepts 4
Programming Concepts,
Conventions and Features 5
S7-200 Instruction Set 6
Communicating over a Network 7
Hardware Troubleshooting Guide
and Software Debugging Tools 8
Creating a Program for the
Position Module 9
Creating a Program for the
Modem Module 10
Using the USS Protocol Library to
Control a MicroMaster Drive 11
Using the Modbus Protocol
Library 12
Technical Specifications A
Calculating a Power Budget B
Error Codes C
Special Memory (SM) Bits D
S7-200 Order Numbers E
Execution Times for STL
Instructions F
S7-200 Quick Reference
Information G
Index
S7-200 Programmable Controller
System Manual
SIMATIC
Edition 04/2002
A5E00157957-01
This manual has the order number:
6ES7298-8FA22-8BH0

Safety Guidelines
This manual contains notices which you should observe to ensure your own personal safety, as well as to
protect the product and connected equipment. These notices are highlighted in the manual by a warning
triangle and are marked as follows according to the level of danger:
Danger
Danger indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
Warning
Warning indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury.
Caution
Caution used with the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
Caution
Caution used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
Notice
Notice indicates a potential situation which, if not avoided, may result in an undesirable result or state.
Qualified Personnel
Only qualified personnel should be allowed to install and work on this equipment. Qualified persons are
defined as persons who are authorized to commission, to ground, and to tag circuits, equipment, and sys-
tems in accordance with established safety practices and standards.
Correct Usage
Note the following:
Warning
This device and its components may only be used for the applications described in the catalog or the
technical descriptions, and only in connection with devices or components from other manufacturers
which have been approved or recommended by Siemens.
This product can only function correctly and safely if it is transported, stored, set up, and installed
correctly, and operated and maintained as recommended.
Trademarks
SIMATICR, SIMATIC HMIRand SIMATIC NETRare registered trademarks of SIEMENS AG.
Some of other designations used in these documents are also registered trademarks; the owner’s rights may be violated
if they are used by third parties for their own purposes.
We have checked the contents of this manual for agreement with the hardware and
software described. Since deviations cannot be precluded entirely, we cannot gua-
rantee full agreement. However, the data in this manual are reviewed regularly and
any necessary corrections included in subsequent editions. Suggestions for impro-
vement are welcomed.
Disclaimer of LiabilityCopyright Siemens AG 2002 All rights reserved
The reproduction, transmission or use of this document or its contents is not
permitted without express written authority. Offenders will be liable for damages.
All rights, including rights created by patent grant or registration of a utility model
or design, are reserved.
Siemens AG
Bereich Automation and Drives
Geschaeftsgebiet Industrial Automation Systems
Postfach 4848, D- 90327 Nuernberg ESiemensAG 2002
Technical data subject to change.
Siemens Aktiengesellschaft 6ES7298-8FA22-8BH0

iii
Preface
The S7-200 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 a
perfect solution for controlling small applications. The wide variety of S7-200 models and the
Windows-based programming tool give you the flexibility you need to solve your automation problems.
Audience
This manual provides information about installing and programming the S7-200 Micro PLCs and is
designed for engineers, programmers, installers, and electricians who have a general knowledge of
programmable logic controllers.
Scope of the Manual
The information contained in this manual pertains in particular to the following products:
S7-200 CPU models: CPU 221, CPU 222, CPU 224, CPU 226, and CPU 226XM
S7-200 EM 22x expansion modules
STEP 7--Micro/WIN, version 3.2, a 32-bit programming software package for the S7-200
STEP 7--Micro/WIN Instruction Libraries and TP-Designer for TP070, Version 1.0, a set of software
tools for customers who use an S7-200 with other components, such as the TP070 Touch Panel,
Modbus, or a MicroMaster drive
Standards Compliance
The SIMATIC S7-200 series meets the following standards:
European Community (CE) Low Voltage Directive 73/23/EEC
EN 61131--2: Programmable Controllers -- Equipment requirements
European Community (CE) EMC Directive 89/336/EEC
Electromagnetic emissions standard
EN 50081--1: residential, commercial, and light industry
EN 50081--2: industrial environment
Electromagnetic immunity standards
EN 61000--6--2: industrial environment
Underwriters Laboratories, Inc.
UL 508 Listed (Industrial Control Equipment) Registration number E75310
Canadian Standards Association: CSA C22.2 Number 142 Certified (Process Control Equipment)
Factory Mutual Research: FM Class I, Division 2, Groups A, B, C, & D Hazardous Locations, T4A
and Class I, Zone 2, IIC, T4
Refer to Appendix A for compliance information.

S7-200 Programmable Controller System Manual
iv
Maritime Approvals
At the time this manual was printed, the SIMATIC S7-200 series met the maritime agencies identifed
below. For the latest product approvals, contact your local Siemens distributor or sales office.
Agency Certificate Number
Lloyds Register of Shipping (LRS) 99 / 20018(E1)
American Bureau of Shipping (ABS) 01--HG20020--PDA
Germanischer Lloyd (GL) 12 045 -- 98 HH
Det Norske Veritas (DNV) A--8071
Bureau Veritas (BV) 09051 / A2 BV
Nippon Kaiji Kyokai (NK) A--534
How to Use This Manual
If you are a first-time (novice) user of S7-200 Micro PLCs, you should read the entire S7-200
Programmable Controller System Manual. If you are an experienced user, refer to the table of contents or
index to find specific information.
The S7-200 Programmable Controller System Manual is organized according to the following topics:
Chapter 1 (Product Overview) provides an overview of some of the features of the S7-200 family of
Micro PLC products.
Chapter 2 (Getting Started) provides a tutorial for creating and downloading a sample control
program to an S7-200.
Chapter 3 (Installing the S7-200) provides the dimensions and basic guidelines for installing the
S7-200 CPU modules and expansion I/O modules.
Chapter 4 (PLC Concepts) provides information about the operation of the S7-200.
Chapter 5 (Programming Concepts, Conventions, and Features) provides information about the
features of STEP 7--Micro/WIN, the program editors and types of instructions (IEC 1131-3 or
SIMATIC), S7-200 data types, and guidelines for creating programs.
Chapter 6 (S7-200 Instruction Set) provides descriptions and examples of programming instructions
supported by the S7-200.
Chapter 7 (Communicating over a Network) provides information for setting up the different network
configurations supported by the S7-200.
Chapter 8 (Hardware Troubleshooting Guide and Software Debugging Tools) provides information
for troubleshooting problems with the S7-200 hardware and about the STEP 7--Micro/WIN features
that help you debug your program.
Chapter 9 (Creating a Program for the Position Module) provides information about the instructions
and wizard used to create a program for the EM 253 Position module.
Chapter 10 (Creating a Program for the Modem Module) provides information about the instructions
and wizard used to create a program for the EM 241 Modem module.
Chapter 11 (Using the USS Protocol Library to Control a MicroMaster Drive) provides information
about the instructions used to create a control program for a MicroMaster drive. It also provides
information about how to configure the MicroMaster 3 and MicroMaster 4 drives.
Chapter 12 (Using the Modbus Protocol Library) provides information about the instructions used to
create a program that uses the Modbus protocol for communications.
Appendix A (Technical Specifications) provides the technical information and data sheets about the
S7-200 hardware.
The other appendices provide additional reference information, such as descriptions of the error codes,
descriptions of the Special Memory (SM) area, part numbers for ordering S7-200 equipment, and STL
instruction execution times.

Preface
v
Additional Information and Assistance
Information about the S7-200 and STEP 7--Micro/WIN
In addition to this manual, STEP 7--Micro/WIN provides extensive online help for getting started with
programming the S7-200. Included with the purchase of the STEP 7--Micro/WIN software is a free
documentation CD. On this CD you can find application tips, an electronic version of this manual and other
information.
Online Help
Help is only a keystroke away! Pressing F1 accesses the extensive online help for STEP 7--Micro/WIN.
The online help includes useful information about getting started with programming the S7-200, as well as
many other topics.
Electronic Manual
An electronic version of this S7-200 System Manual is available on the documentation CD. You can install
the electronic manual onto your computer so that you can easily access the information in the manual
while you are working with the STEP 7--Micro/WIN software.
Tips and Tricks
The documentation CD includes Tips and Tricks, a set of application examples with sample programs.
Reviewing or modifying these examples can help you find efficient or innovative solutions for your own
application. You can also find the most current version of Tips and Tricks on the S7-200 Internet site.
Internet: www.siemens.com/S7--200
For additional information about Siemens products and services, technical support, frequently asked
questions (FAQs), product updates, or application tips, refer to the following Internet addresses:
www.ad.siemens.de for general Siemens information
This Siemens Automation & Drives Internet site includes information about the SIMATIC product line
and other products available from Siemens.
www.siemens.com/S7--200 for S7-200 product information
The S7-200 Internet site includes frequently asked questions (FAQs), Tips and Tricks (application
examples and sample programs), information about newly released products, and product updates
or downloads.

S7-200 Programmable Controller System Manual
vi
Technical Assistance and Purchasing S7-200 Products
Local Siemens Sales Office or Distributor
For assistance in answering any technical questions, for training on the S7-200 products, or for ordering
S7-200 products, contact your Siemens distributor or sales office. 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 that you might encounter.
Technical Services
The highly trained staff of the S7-200 Technical Services center is also available to help you solve any
problems that you might encounter. You can call on them 24 hours a day, 7 days a week:
For calls originating from within the United States of America
Local time: Monday to Friday 0800 to 1900 Eastern time
Telephone: [phone]
Fax: [phone]
E-Mail: [e-mail]
For calls originating from the Americas outside of the USA
Local time: Monday to Friday 0800 to 1900 Eastern time
Telephone: [phone]
Fax: [phone]
E-Mail: [e-mail]
For calls originating from Europe and Africa
Local time (Nuremberg): Monday to Friday 0700 to 1700
Telephone: [phone]
Fax: [phone]
E-Mail: [e-mail]
For calls originating from Asia and Australia
Local time (Singapore): Monday to Friday 0830 to 1730
Telephone: [phone]
Fax: [phone]
E-Mail: [e-mail]

vii
Contents
1 Product Overview 1.............................................................
S7-200 CPU 2..........................................................................
S7-200 Expansion Modules 3.............................................................
STEP 7--Micro/WIN Programming Package 3................................................
Communications Options 4...............................................................
Display Panels 4........................................................................
2 Getting Started 5................................................................
Connecting the S7-200 CPU 6............................................................
Creating a Sample Program 8.............................................................
Downloading the Sample Program 11.......................................................
Placing the S7-200 in RUN Mode 11........................................................
3 Installing the S7-200 13...........................................................
Guidelines for Installing S7-200 Devices 14..................................................
Installing and Removing the S7-200 Modules 15..............................................
Guidelines for Grounding and Wiring 18.....................................................
4 PLC Concepts 21.................................................................
Understanding How the S7-200 Executes Your Control Logic 22................................
Accessing the Data of the S7-200 24........................................................
Understanding How the S7-200 Saves and Restores Data 34...................................
Storing Your Program on a Memory Cartridge 36..............................................
Selecting the Operating Mode for the S7-200 CPU 37..........................................
Using Your Program to Save V Memory to the EEPROM 38....................................
Features of the S7-200 39.................................................................
5 Programming Concepts, Conventions, and Features 47.............................
Guidelines for Designing a Micro PLC System 48.............................................
Basic Elements of a Program 49............................................................
Using STEP 7--Micro/WIN to Create Your Programs 51........................................
Choosing Between the SIMATIC and IEC 1131--3 Instruction Sets 53............................
Understanding the Conventions Used by the Program Editors 54................................
Using Wizards To Help You Create Your Control Program 56....................................
Handling Errors in the S7-200 56...........................................................
Assigning Addresses and Initial Values in the Data Block Editor 58..............................
Using the Symbol Table for Symbolic Addressing of Variables 58................................
Using Local Variables 59..................................................................
Using the Status Chart to Monitor Your Program 59............................................
Creating an Instruction Library 60...........................................................
Features for Debugging Your Program 60....................................................

S7-200 Programmable Controller System Manual
viii
6 S7-200 Instruction Set 61.........................................................
Conventions Used to Describe the Instructions 63.............................................
S7-200 Memory Ranges and Features 64....................................................
Bit Logic Instructions 66...................................................................
Contacts 66.........................................................................
Coils 68.............................................................................
Logic Stack Instructions 70............................................................
Set and Reset Dominant Bistable Instructions 72..........................................
Clock Instructions 73......................................................................
Communications Instructions 74............................................................
Network Read and Network Write Instructions 74..........................................
Transmit and Receive Instructions (Freeport) 79..........................................
Get Port Address and Set Port Address Instructions 88....................................
Compare Instructions 89..................................................................
Comparing Numerical Values 89........................................................
Compare String 91...................................................................
Conversion Instructions 92.................................................................
Standard Conversion Instructions 92....................................................
ASCII Conversion Instructions 96.......................................................
String Conversion Instructions 100.......................................................
Encode and Decode Instructions 105.....................................................
Counter Instructions 106....................................................................
SIMATIC Counter Instructions 106.......................................................
IEC Counter Instructions 109............................................................
High-Speed Counter Instructions 111.........................................................
Pulse Output Instruction 125................................................................
Math Instructions 140......................................................................
Add, Subtract, Multiply, and Divide Instructions 140.........................................
Multiply Integer to Double Integer and Divide Integer with Remainder 142......................
Numeric Functions Instructions 143......................................................
Increment and Decrement Instructions 144................................................
Proportional/Integral/Derivative (PID) Loop Instruction 145.......................................
Interrupt Instructions 155...................................................................
Logical Operations Instructions 162..........................................................
Invert Instructions 162..................................................................
AND, OR, and Exclusive OR Instructions 163..............................................
Move Instructions 165......................................................................
Move Byte, Word, Double Word, or Real 165..............................................
Move Byte Immediate (Read and Write) 166...............................................
Block Move Instructions 167............................................................
Program Control Instructions 168............................................................
Conditional End 168...................................................................
Stop 168.............................................................................
Watchdog Reset 168...................................................................
For--Next Loop Instructions 170..........................................................
Jump Instructions 172..................................................................
Sequence Control Relay (SCR) Instructions 173...........................................

Contents
ix
Shift and Rotate Instructions 179.............................................................
Shift Right and Shift Left Instructions 179..................................................
Rotate Right and Rotate Left Instructions 179..............................................
Shift Register Bit Instruction 181.........................................................
Swap Bytes Instruction 183.............................................................
String Instructions 184.....................................................................
Table Instructions 189......................................................................
AddToTable 189......................................................................
First-In-First-Out and Last-In-First-Out 190................................................
Memory Fill 192.......................................................................
Table Find 193........................................................................
Timer Instructions 196......................................................................
SIMATIC Timer Instructions 196.........................................................
IEC Timer Instructions 201..............................................................
Subroutine Instructions 203.................................................................
7 Communicating over a Network 207................................................
Understanding the Basics of S7-200 Network Communications 208...............................
Selecting the Communications Protocol for Your Network 211....................................
Installing and Removing Communications Interfaces 216........................................
Building Your Network 218..................................................................
Creating User-Defined Protocols with Freeport Mode 222.......................................
Using Modems and STEP 7--Micro/WIN with Your Network 224..................................
Advanced Topics 228......................................................................
8 Hardware Troubleshooting Guide and Software Debugging Tools 235.................
Features for Debugging Your Program 236....................................................
Displaying the Program Status 238...........................................................
Using a Status Chart to Monitor and Modify the Data in the S7-200 239............................
Forcing Specific Values 240.................................................................
Running Your Program for a Specified Number of Scans 240....................................
Hardware Troubleshooting Guide 241........................................................
9 Creating a Program for the Position Module 243.....................................
Features of the Position Module 244.........................................................
Configuring the Position Module 246.........................................................
Position Instructions Created by the Motion Control Wizard 257..................................
Sample Programs for the Position Module 269.................................................
Monitoring the Position Module with the EM 253 Control Panel 274...............................
Error Codes for the Position Module and the Position Instructions 276.............................
Advanced Topics 278......................................................................

S7-200 Programmable Controller System Manual
x
10 Creating a Program for the Modem Module 287......................................
Features of the Modem Module 288..........................................................
Using the Modem Expansion Wizard to Configure the Modem Module 294.........................
Overview of Modem Instructions and Restrictions 298..........................................
Instructions for the Modem Module 299.......................................................
Sample Program for the Modem Module 303..................................................
S7-200 CPUs that Support Intelligent Modules 303.............................................
Special Memory Location for the Modem Module 304...........................................
Advanced Topics 306......................................................................
Messaging Telephone Number Format 308....................................................
Text Message Format 309..................................................................
CPU Data Transfer Message Format 310.....................................................
11 Using the USS Protocol Library to Control a MicroMaster Drive 311...................
Requirements for Using the USS Protocol 312.................................................
Calculating the Time Required for Communicating with the Drive 313.............................
Using the USS Instructions 314..............................................................
Instructions for the USS Protocol 315.........................................................
Sample Programs for the USS Protocol 322...................................................
USS Execution Error Codes 323.............................................................
Connecting and Setting Up the MicroMaster Series 3 Drive 324..................................
Connecting and Setting Up the MicroMaster Series 4 Drive 327..................................
12 Using the Modbus Protocol Library 329.............................................
Requirements for Using the Modbus Protocol 330..............................................
Initialization and Execution Time for the Modbus Protocol 330....................................
Modbus Addressing 331....................................................................
Using the Modbus Slave Protocol Instructions 332.............................................
Instructions for the Modbus Slave Protocol 333................................................
A Technical Specifications 337.......................................................
General Technical Specifications 338.........................................................
CPU Specifications 340....................................................................
Digital Expansion Modules Specifications 346.................................................
Analog Expansion Modules Specifications 351.................................................
Thermocouple and RTD Expansion Modules Specifications 361..................................
EM 277 PROFIBUS--DP Module Specifications 373............................................
EM 241 Modem Module Specifications 385....................................................
EM 253 Position Module Specifications 387...................................................
AS--Interface (CP 243--2) Module Specifications 393............................................
Optional Cartridges 395....................................................................
I/O Expansion Cable 395...................................................................
PC/PPI Cable 396.........................................................................
Input Simulators 398.......................................................................
B Calculating a Power Budget 399....................................................

Contents
xi
C Error Codes 403...................................................................
Fatal Error Codes and Messages 404........................................................
Run-Time Programming Problems 405.......................................................
Compile Rule Violations 406................................................................
D Special Memory (SM) Bits 407......................................................
SMB0: Status Bits 408.....................................................................
SMB1: Status Bits 408.....................................................................
SMB2: Freeport Receive Character 409......................................................
SMB3: Freeport Parity Error 409.............................................................
SMB4: Queue Overflow 409.................................................................
SMB5: I/O Status 410......................................................................
SMB6: CPU ID Register 410................................................................
SMB7: Reserved 410......................................................................
SMB8 to SMB21: I/O Module ID and Error Registers 411........................................
SMW22 to SMW26: Scan Times 412.........................................................
SMB28 and SMB29: Analog Adjustment 412..................................................
SMB30 and SMB130: Freeport Control Registers 412...........................................
SMB31 and SMW32: Permanent Memory (EEPROM) Write Control 413...........................
SMB34 and SMB35: Time Interval Registers for Timed Interrupts 413.............................
SMB36 to SMB65: HSC0, HSC1, and HSC2 Register 413.......................................
SMB66 to SMB85: PTO/PWM Registers 415..................................................
SMB86 to SMB94, and SMB186 to SMB194: Receive Message Control 416.......................
SMW98: Errors on the Expansion I/O Bus 417.................................................
SMB130: Freeport Control Register (see SMB30) 417..........................................
SMB131 to SMB165: HSC3, HSC4, and HSC5 Register 417.....................................
SMB166 to SMB185: PTO0, PTO1 Profile Definition Table 418...................................
SMB186 to SMB194: Receive Message Control (see SMB86 to SMB94) 418.......................
SMB200 to SMB549: Intelligent Module Status 419.............................................
E S7-200 Order Numbers 421.........................................................
F Execution Times for STL Instructions 425...........................................
G S7-200 Quick Reference Information 431............................................
Index 437...............................................................................

S7-200 Programmable Controller System Manual
xii

1
Product Overview
The S7-200 series of micro-programmable logic controllers (Micro PLCs) can control a wide variety of
devices to support your automation needs.
The S7-200 monitors inputs and changes outputs as controlled by the user program, which can include
Boolean logic, counting, timing, complex math operations, and communications with other intelligent
devices. The compact design, flexible configuration, and powerful instruction set combine to make the
S7-200 a perfect solution for controlling a wide variety of applications.
In This Chapter
S7-200 CPU 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
S7-200 Expansion Modules 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STEP 7–Micro/WIN Programming Package 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communications Options 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display Panels 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1
S7-200 Programmable Controller System Manual
2
S7-200 CPU
The S7-200 CPU combines a microprocessor, an integrated power supply, input circuits, and output
circuits in a compact housing to create a powerful Micro PLC. See Figure 1-1. After you have downloaded
your program, the S7-200 contains the logic required to monitor and control the input and output devices
in your application.
I/O LEDs
Status LEDs:
System Fault
RUN
STOP
Optional cartridge:
EEPROM
Real-time Clock
Battery
Communications port
Terminal connector
(removable on CPU 224, CPU 226
and CPU 226XM)
Clip for installation on a standard (DIN) rail
Access door:
Mode selector switch (RUN/STOP)
Analog adjustment potentiometer(s)
Expansion port (for most CPUs)
Figure 1-1 S7-200 Micro PLC
Siemens provides different S7-200 CPU models with a diversity of features and capabilities that help you
create effective solutions for your varied applications. Table 1-1 briefly compares some of the features of
the CPU. For detailed information about a specific CPU, see Appendix A.
Table 1-1 Comparison of the S7-200 CPU Models
Feature CPU 221 CPU 222 CPU 224 CPU 226 CPU 226XM
Physical size (mm) 90 x 80 x 62 90 x 80 x 62 120.5 x 80 x 62 190 x 80 x 62 190 x 80 x 62
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Program memory 2048 words
ÑÑÑÑÑ
ÑÑÑÑÑ
2048 words
ÑÑÑÑÑ
ÑÑÑÑÑ
4096 words
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
4096 words
ÑÑÑÑÑ
ÑÑÑÑÑ
8192 words
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Data memory 1024 words
ÑÑÑÑÑ
ÑÑÑÑÑ
1024 words
ÑÑÑÑÑ
ÑÑÑÑÑ
2560 words
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
2560 words
ÑÑÑÑÑ
ÑÑÑÑÑ
5120 words
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Memory backup 50 hours typical
ÑÑÑÑÑ
ÑÑÑÑÑ
50 hours typical
ÑÑÑÑÑ
ÑÑÑÑÑ
190 hours typical
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
190 hours typical
ÑÑÑÑÑ
ÑÑÑÑÑ
190 hours typical
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Local on-board I/O 6 In/4 Out
ÑÑÑÑÑ
ÑÑÑÑÑ
8 In/6 Out
ÑÑÑÑÑ
ÑÑÑÑÑ
14 In/10 Out
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
24 In/16 Out
ÑÑÑÑÑ
ÑÑÑÑÑ
24 In/16 Out
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Expansion modules 0
ÑÑÑÑÑ
ÑÑÑÑÑ
2
ÑÑÑÑÑ
ÑÑÑÑÑ
7
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
7
ÑÑÑÑÑ
ÑÑÑÑÑ
7
ÑÑÑÑÑÑ
Ñ
ÑÑÑÑ
Ñ
ÑÑÑÑÑÑ
High-speed counters
Single phase
Two phase 4 at 30 kHz 2 at 20 kHz
ÑÑÑÑÑ
Ñ
ÑÑÑ
Ñ
ÑÑÑÑÑ
4 at 30 kHz
2 at 20 kHz
ÑÑÑÑÑ
Ñ
ÑÑÑ
Ñ
ÑÑÑÑÑ
6 at 30 kHz
4 at 20 kHz
ÑÑÑÑÑÑ
Ñ
ÑÑÑÑ
Ñ
ÑÑÑÑÑÑ
6 at 30 kHz
4 at 20 kHz
ÑÑÑÑÑ
Ñ
ÑÑÑ
Ñ
ÑÑÑÑÑ
6 at 30 kHz
4 at 20 kHz
Pulse outputs (DC) 2 at 20 kHz 2 at 20 kHz 2 at 20 kHz 2 at 20 kHz 2 at 20 kHz
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
Analog adjustments 1
ÑÑÑÑÑ
ÑÑÑÑÑ
1
ÑÑÑÑÑ
ÑÑÑÑÑ
2
ÑÑÑÑÑÑ
ÑÑÑÑÑÑ
2
ÑÑÑÑÑ
ÑÑÑÑÑ
2
Real-time clock Cartridge Cartridge Built-in Built-in Built-in
Communications
ports 1RS–485 1RS–485 1RS–485 2RS–485 2RS–485
Floating-point math Yes
Digital I/O image size 256 (128 in, 128 out)
Boolean execution
speed 0.37 microseconds/instruction

1
Product Overview Chapter 1
3
S7-200 Expansion Modules
To better solve your application requirements, the S7-200 family includes a wide variety of expansion
modules. You can use these expansion modules to add additional functionality to the S7-200 CPU.
Table 1-2 provides a list of the expansion modules that are currently available. For detailed information
about a specific module, see Appendix A.
Table 1-2 S7-200 Expansion Modules
Expansion Modules Types
Discrete modules Input
Output
Combination
8 x DC In 8 x AC In
8 x DC Out 8 x AC Out 8 x Relay
4 x DC In / 4 x DC Out 8 x DC In / 8 x DC Out 16 x DC In / 16 x DC Out
4 x DC In / 4 x Relay 8 x DC In / 8 x Relay 16 x DC In / 16 x Relay
Analog modules Input
Output
Combination
4 x Analog In 4 x Thermocouple In 2 x RTD In
2 x Analog Out
4 x Analog In / 1 Analog Out
Intelligent modules Position Modem PROFIBUS-DP
Other modules AS–Interface
STEP 7–Micro/WIN Programming Package
The STEP 7–Micro/WIN programming package provides a user-friendly environment to develop, edit, and
monitor the logic needed to control your application. STEP 7–Micro/WIN provides three program editors
for convenience and efficiency in developing the control program for your application. To help you find the
information you need, STEP 7–Micro/WIN provides an extensive online help system and a documentation
CD that contains an electronic version of this manual, application tips, and other useful information.
Computer Requirements
STEP 7–Micro/WIN runs on either a personal computer or a Siemens programming device, such as a
PG 760. Your computer or programming device should meet the following minimum requirements:
-Operating system:
Windows 95, Windows 98, Windows 2000,
Windows Me (Millennium Edition), or
Windows NT 4.0 (or later version)
-At least 50M bytes of free hard disk space
-Mouse (recommended)
Figure1-2 STEP7–Micro/WIN

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S7-200 Programmable Controller System Manual
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Installing STEP 7–Micro/WIN
Insert the STEP 7–Micro/WIN CD into the CD-ROM drive of your computer. The installation wizard starts
automatically and prompts you through the installation process. Refer to the Readme file for more
information about installing STEP 7–Micro/WIN.
Tip
To install STEP 7–Micro/WIN on a Windows NT or Windows 2000 operating system, you must log in
with Administrator privileges.
CommunicationsOptions
Siemens provides two programming options for connecting your computer to your S7-200: a direct
connection with a PC/PPI cable, or a Communications Processor (CP) card with an MPI cable for MPI and
PROFIBUS–DP networks.
The PC/PPI programming cable is the most common and economical method of connecting your
computer to the S7-200. This cable connects the communications port of the S7-200 to the serial
communications of your computer. The PC/PPI programming cable can also be used to connect other
communications devices to the S7-200.
To use the MPI cable, you must also install a CP card in your computer. The CP card provides the extra
hardware required to connect at higher baud rates and to handle high-speed network communications.
Display Panels
TD 200 Text Display Unit
The TD 200 is a 2-line, 20-character, text display device that can be connected to the S7-200. Using the
TD 200 wizard, you can easily program your S7-200 to display text messages and other data pertaining to
your application.
The TD 200 provides a low cost interface to your
application by allowing you to view, monitor, and
change the process variables pertaining to your
application.
A separate manual describes the detailed
functionality and specifications of the TD 200.
Figure1-3 TD 200 Text Display Unit
TP070 Touch Panel Display
The TP070 is a touch panel display device that
can be connected to the S7-200. This touch
panel provides you with a means to customize
your operator interface.
The TP070 can display custom graphics, slider
bars, application variables, custom user buttons,
and so forth, by means of a user-friendly touch
panel.
The optional TP–Designer for TP070, Version 1.0
CD provides the TP Designer software, which is
required for programming your TP070. Figure1-4 TP070 Touch Panel Unit

5
Getting Started
STEP 7–Micro/WIN makes it easy for you to program your S7-200. In just a few short steps using a simple
example, you can learn how to connect, program, and run your S7-200.
All you need for this example is a PC/PPI cable, an S7-200 CPU, and a programming device running the
STEP 7–Micro/WIN programming software.
In This Chapter
Connecting the S7-200 CPU 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Creating a Sample Program 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Downloading the Sample Program 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Placing the S7-200 in RUN Mode 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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S7-200 Programmable Controller System Manual
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Connectingthe S7-200 CPU
Connecting your S7-200 is easy. For this example, you only need to connect power to your S7-200 CPU
and then connect the communications cable between your programming device and the S7-200 CPU.
Connecting Power to the S7-200 CPU
The first step is to connect the S7-200 to a power source. Figure 2-1 shows the wiring connections for
either a DC or an AC model of the S7-200 CPU.
Before you install or remove any electrical device, ensure that the power to that equipment has been
turned off. Always follow appropriate safety precautions and ensure that power to the S7-200 is disabled
before attempting to install or remove the S7-200.
Warning
Attempts to install or wire the S7-200 or related equipment with power applied could cause electric
shock or faulty operation of equipment. Failure to disable all power to the S7-200 and related equipment
during installation or removal procedures could result in death or serious injury to personnel, and/or
damage to equipment.
Always follow appropriate safety precautions and ensure that power to the S7-200 is disabled before
attempting to install or remove the S7-200 or related equipment.
DC Installation AC Installation
24 VDC 85 to 265 VAC
Figure2-1 Connecting Power to the S7-200 CPU
Connecting the PC/PPI Cable
Figure 2-2 shows a PC/PPI cable connecting the
S7-200 to the programming device. To connect
the PC/PPI cable:
1. Connect the RS-232 connector (marked
“PC”) of the PC/PPI cable to the
communications port of the programming
device. (For this example, connect to
COM 1.)
2. Connect the RS-485 connector (marked
“PPI”) of the PC/PPI cable to Port 0 or
Port 1 of the S7-200.
3. Ensure that the dipswitches of the PC/PPI
cable are set as shown in Figure 2-2.
PC/PPI cable
S7-200
Programming
Device
1 2 3 4 5 6
↑1 –On
↓0 –Off
Figure2-2 Connecting the PC/PPI Cable

2
Getting Started Chapter 2
7
Starting STEP 7–Micro/WIN
Click on the STEP 7–Micro/WIN icon to open a
new project. Figure 2-3 shows a new project.
Notice the navigation bar. You can use the icons
on the navigation bar to open elements of the
STEP 7–Micro/WIN project.
Click on the Communications icon in the
navigation bar to display the Communications
dialog box. You use this dialog box to set up the
communications for STEP 7–Micro/WIN.
Navigation bar
Communications icon
Figure2-3 New STEP 7–Micro/WIN Project
Verifying the Communications Parameters for STEP 7–Micro/WIN
The example project uses the default settings for
STEP 7–Micro/WIN and the PC/PPI cable. To
verify these settings:
1. Verify that the address of the PC/PPI cable
in the Communications dialog box is set
to 0.
2. Verify that the interface for the network
parameter is set for PC/PPI cable(COM1).
3. Verify that the transmission rate is set to
9.6 kbps.
If you need to change your communications
1.
3.
2.
If you need to change your communications
parameter settings, see Chapter 7. Figure2-4 Verifying the Communications Parameters
Establishing Communications with the S7-200
Use the Communications dialog box to connect with your S7-200 CPU:
1. Double-click the refresh icon in the
Communications dialog box.
STEP 7–Micro/WIN searches for the
S7-200 station and displays a CPU icon
for the connected S7-200 station.
2. Select the S7-200 and click OK.
If STEP 7–Micro/WIN does not find your S7-200
CPU, check the settings for the communications
parameters and repeat these steps.
After you have established communications with
the S7-200, you are ready to create and
1.
the S7-200, you are ready to create and
download the example program. Figure2-5 Establishing Communications to the S7-200

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S7-200 Programmable Controller System Manual
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Creating a Sample Program
Entering this example of a control program will help you understand how easy it is to use
STEP 7–Micro/WIN. This program uses six instructions in three networks to create a very simple,
self-starting timer that resets itself.
For this example, you use the Ladder (LAD) editor to enter the instructions for the program. The following
example shows the complete program in both LAD and Statement List (STL). The network comments in
the STL program explain the logic for each network. The timing diagram shows the operation of the
program.
Example: Sample Program for getting started with STEP 7–Micro/WIN
Network 1 //10 ms timer T33 times out after (100 x 10 ms = 1 s)
//M0.0 pulse is too fast to monitor with Status view.
LDN M0.0
TON T33, +100
Network 2 //Comparison becomes true at a rate that is visible with
//Status view. Turn on Q0.0 after (40 x 10 ms = 0.4 s),
//for a 40% OFF/60% ON waveform.
LDW>= T33, +40
= Q0.0
Network 3 //T33 (bit) pulse too fast to monitor with Status view.
//Reset the timer through M0.0 after the
//(100 x 10 ms = 1 s) period.
LD T33
= M0.0
Timing Diagram