Creating A Program For The Modem Module - Siemens SIMATIC S7-200 System Manual

Creating a Program for the
Modem Module
The EM 241 Modem module allows you to connect your S7-200 directly to an analog telephone
line, and supports communications between your S7-200 and STEP 7--Micro/WIN. The Modem
module also supports the Modbus slave RTU protocol. Communications between the Modem
module and the S7-200 are made over the Expansion I/O bus.
STEP 7--Micro/WIN provides a Modem Expansion wizard to help set up a remote modem or a
Modem module for connecting a local S7-200 to a remote device.
In This Chapter
Features of the Modem Module
Using the Modem Expansion Wizard to Configure the Modem Module
Overview of Modem Instructions and Restrictions
Instructions for the Modem Module
Sample Program for the Modem Module
S7-200 CPUs that Support Intelligent Modules
Special Memory Location for the Modem Module
Advanced Topics
Messaging Telephone Number Format
Text Message Format
CPU Data Transfer Message Format
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