Functions
8.2 Time stamping the input signals with IM 153-2
ET 200M
140 Operating Instructions, 12/2008, EWA-4NEB780600602-08
8.2.2.4 Time stamping in the redundant system
The IM 153-2 supports the function time stamping even in the redundant system S7-400H.
Time stamping of signal changes in an S7-400H
Both IM 153-2 save the messages of the time-stamped signals. This way, after a changeover
process from active to passive IM 153-2 the "new" active IM 153-2 prepares the current
messages for further processing.
Note
During the changeover between the two IM 153-2 the signal changes are not time stamped.
This time is communicated by the special message "Changeover with redundant BEGIN /
END".
You will find more information on time stamping in redundant systems in the "PCS 7
documentation (http://support.automation.siemens.com/WW/view/en/10806846/130000
)"
documentation.
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① WinCC Operator station (OS) for unit visualization
② Industrial Ethernet
③ Time master (SICLOCK)
④ ET 200M distributed I/O with 2 x IM 153-2
⑤ redundant DP master system
⑥ S7-400H automation system
⑦ Optional: RS 485 repeater
Figure 8-7 Example structure with 2 x IM 153-2 for redundancy in an H system
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