I am getting the below message stating Negative time shift in one of the PI OPC Interface node. I am trying to understand what could cause such time shifts.
For this particular interface "Interface provide timestamp" is selected. The PI server and PI interface is on same time zone.
opcint.exe version 188.8.131.52
UniInt version 184.108.40.206
7/31/2018 11:20:39.68501 PM, 0, Information, 31-Jul-18 23:20:39 OPCpi> 8 2> WARNING. Negative time shift of 5.200000 seconds detected for Uniint scheduling. ScheduleTime=1533093630.001000. LastScheduleTime=1533093635.201000, pilogsrv, , , , , , , , , , ,
7/31/2018 11:20:39.67601 PM, 4, Information, WARNING. Negative time shift of 5.200000 seconds detected for Uniint scheduling. ScheduleTime=1533093630.001000. LastScheduleTime=1533093635.201000, OPCInt8, , , , , , , , , , ,
No time shift error are logged (eventvwr- system and application) in PI server and on this PI interface node.
1.Does the above error means the shift occurred on the interface node? can it be even on the OPC server side?
2.If there was a time shift how can I verify it ? In this case I can see it for 5 sec.
3.Also I didn't not see this error on the failover node.
4.Is It the network or it could be the some patch installation?
Thanks in advance.
That would indicate a shift on the interface node. UniInt only reports the negative time shift if current time + 5 seconds is less than the last time the scan was triggered:
I would highly suggest going through KB00919 - Troubleshooting clock jitter and KB00330 - When is a "Negative time shift" message written to the pipc.log and making sure that all the interface nodes and PI Data Archives are synced to a time server.