So reading and logging are both at 7:00:03.
That is still not ok. Reading a value to the HMI from the PLC does not happen instantaneously.
You need to allow the HMI time to read the value from the PLC.
You can do the logging "on change" or you could offset the times like this:
7:00:00 PLC writes new value into the tag.
7:00:05 HMI reads the tag.
7:00:10 HMI logs the value.
edit: You are actually not informing how the tag is being read by the HMI.
post a screenshot of the setup of the tag in WinCC.
That is still not ok. Reading a value to the HMI from the PLC does not happen instantaneously.
You need to allow the HMI time to read the value from the PLC.
You can do the logging "on change" or you could offset the times like this:
7:00:00 PLC writes new value into the tag.
7:00:05 HMI reads the tag.
7:00:10 HMI logs the value.
edit: You are actually not informing how the tag is being read by the HMI.
post a screenshot of the setup of the tag in WinCC.
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