Differences between multiple OPC UA clients connected to the same OPC UA server

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I have two OPC clients subbed to about 160 items(temp sensors,pressure sensors,...) on a Siemens PLC(S7 1500) OPC UA server. Each client is on a different machine (one is on-site, other is hosted on cloud). When we compare results on each client we can see small differences with our data. sometimes there is more data on one computer, sometimes there is more on the other. sometimes values are different for the same timestamp

Here is an example of a compare for 1 item between two clients compare of values between two clients

We use the SourceTimestamp of the monitored item and its value coming from the OPC server to put it in the database.

This is not a big issue but I would like to understand why there is such a difference between two identical clients.

siemens plc opc-ua
1 Answers

You've lost a lot of precision using the date/time format in your screenshots. Perhaps it's just a rounding issue and the underlying timestamps aren't exactly the same like you think they are?

user_859270
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