Siemens SIMATIC S7-200 System Manual page 3

Preface
Purpose of the manual
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.
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.
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 is valid for STEP 7--Micro/WIN, version 4.0 and the S7-200 CPU product family. For
a complete list of the S7-200 products and order numbers described in this manual, see
Appendix A.
Changes compared to the previous version
This manual has been revised to include two new analog expansion modules and one additional
appendix.
EM 231 Analog Input RTD, 4 Inputs
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EM 231 Analog Input Thermocouple 8 Inputs
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Appendix H, S7-200CN Products
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Certification
The SIMATIC S7-200 products have the following certification:
Underwriters Laboratories, Inc. UL 508 Listed (Industrial Control Equipment),
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Registration number E75310
Canadian Standards Association: CSA C22.2 Number 142 (Process Control Equipment)
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Factory Mutual Research: Class Number 3600, Class Number 3611, FM Class I, Division 2,
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Groups A, B, C, & D Hazardous Locations, T4A and Class I, Zone 2, IIC, T4
Tip
The SIMATIC S7-200 series meets the CSA standard.
The cULus logo indicates that the S7-200 has been examined and certified by Underwriters
Laboratories (UL) to standards UL 508 and CSA 22.2 No. 142.
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