Siemens SIMATIC ET 200AL, System Manual

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Programming
4.3 Time-based IO
High-precision input/output with Time-based IO
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The following figure shows an example with EdgeSel = 4n (first positive, then falling edge).
In this case the first valid positive edge at DI0 grants the enable for DQ0 after the start of a
read-in job.
1 Start of enable at positive edge of enable input
2 End of enable when falling edge at REQ
If required, you can use the time stamps detected by the instruction for your application.
Reaction to error
The Error output indicates if the instruction was processed correctly. In the event of an error,
the cause of the error is displayed at the Status output.