Siemens SIMATIC ET 200M Operating Instructions Manual page 144

Functions
8.2 Time stamping the input signals with IM 153-2
Example structure for time stamping signal changes with IM 153-2
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Figure 8-9
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WinCC Operator station (OS) for unit visualization
Industrial Ethernet
Time master (SICLOCK)
ET 200M Distributed I/O
SM 321 digital input module (6ES7321-7BH...)
CP 443-5 (DP master)
PROFIBUS DP
CP 443-1
S7-400 automation system
Optional: RS 485 repeater
Example structure for time stamping signal changes with IM 153-2
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Operating Instructions, 12/2008, EWA-4NEB780600602-08
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ET 200M