Manage time
Precise timing is critical for most module services including data collection, data transfer, and data storage because all events are time-stamped and their order is important. To provide accurate time for these services, you can configure the module to synchronize time with a variety of time sources.
FactoryTalk Historian ME can periodically check external time sources to synchronize its
time settings. The synchronization is based on a single selected time source that
coordinates time accuracy among different devices in your FactoryTalk environment. You can
synchronize the module's Universal Coordinated Time (UTC) with a controller (preferred
solution) or a network NTP time server computer. Alternatively, you can set the time
manually.
Changing the module time may affect its performance and services. If you change the module time to a past time compared to the current module time, the module will reboot into safe mode if the time change results in either of the following:
- The new time is in the past compared to the timestamps of the archive files.
- There are archive files with overlapping time ranges.
If the module enters safe mode, repair the archive files and get the module out of safe mode.
For details, see Repair archives using safe mode.
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