Siemens SIMATIC ET 200M Operating Instructions Manual page 148

Functions
8.2 Time stamping the input signals with IM 153-2
Sample configuration: Communication processor as DP master as well as a separate time master
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Figure 8-12
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Operator station (OS) for unit visualization
Industrial Ethernet
CPU
Communication processor for connection to an Industrial Ethernet
Communication processor as DP master
Automation system
ET 200M Distributed I/O
Digital input group; e.g. SM 321-7BH...
Time master
PROFIBUS DP
Sample configuration: Communication processor as DP master as well as a separate
time master
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Operating Instructions, 12/2008, EWA-4NEB780600602-08
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ET 200M