For events that affect the time stamping (STOP of the time stamping, time frame failure, etc.),
special messages are generated.
A special message provides the following information:
● Slot number of the IM 650 (always "2")
● Identifier of the special message (e.g. STOP of the time stamping)
● Characteristic of the special message (e.g. incoming/outgoing)
● Time of the special message
Parameter assignment
With the parameter assignment, you specify which digital input data of the IM 650 will be
monitored. For the time stamping, these are signal changes on digital inputs.
Both signal edges are always stamped. You can make the following assignment for this:
● "Rising edge" (0 → 1) as "incoming signal"
It follows that the "falling edge" (1 → 0) is the "outgoing signal".
● "falling edge" (1 → 0) as "incoming signal"
It follows that the "rising edge" (0 → 1) is the "outgoing signal".
Note
There are no parameters for setting the time stamping accuracy. To achieve the respective
accuracy however, the specified conditions and rules must be complied with.
7.4.2 Time stamp with 10 ms precision
Requirements
● The 10 ms time stamping of digital input signals must be supported end-to-end by all
hardware and software components, from the IM 650 to the automation system with its
components all the way to the operator station for plant visualization.
● Set the synchronization interval to 10 seconds.
Functions
7.4 Time stamping of the input signals with IM 650
ET 200PA SMART
Operating Instructions, 06/2019, A5E34192013-AB 75
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