Clock drifts
It is recommended to synchronize all devices with a single reliable time source. You should try to minimize the clock drifts that may occur among the module, the FactoryTalk Historian SE or PI server, and any controllers. To adjust for any time variations caused by clock drifts, the module will slew or step as needed.
You can find any time-related information and warnings in the module's log files.
If you have configured your points to have a high-speed scan type and the controller time drifts more than 30 seconds (either forwards or backwards), a message similar to the following appears in the system log:
27-Nov-09 13:24:09 logixd [WARNING] Logixd detected a controller time shift greater than thirty seconds on High Speed Trend instance 7 running on Data Source All_Type_Combination_07072009_v17_1_1.
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