Siemens SIMATIC ET 200M Operating Instructions Manual page 134

Functions
8.2 Time stamping the input signals with IM 153-2
Parameter assignment
With the configuration you establish which digital input data of the IM 153-2 is going to be
monitored. For the time stamping, these are signal changes on the digital inputs.
Two signal edges are always stamped. In doing so, the following assignment can be
configured:
● "rising edge" (0 → 1) as "incoming signal"
● "falling edge" (1 → 0) as "incoming signal"
Note
There are no parameters for setting the time stamping precision. To achieve the
respective precision however, the specified conditions and rules must be complied with.
8.2.2 Functionalities
8.2.2.1 Time stamp with 10 ms precision
Requirements
● The 10-ms time stamping of digital input signals must be consistently supported by all the
● The synchronization interval must be set at 10 seconds.
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As a result, the "falling edge" (1 → 0) is the "outgoing signal".
As a result, the "rising edge" (0 → 1) is the "outgoing signal".
hardware and software components: from the IM 153-2 via an automation system with its
components up to, if necessary, the operator station for the unit visualization.
Operating Instructions, 12/2008, EWA-4NEB780600602-08
ET 200M