An NTP server such as a SICLOCK or a PC is required to synchronize the time of the S7-400IE.
It only forwards the unadulterated GMT time to the connected NTP clients, with no time zone
information.
Note
You can find more information about configuration in the "PCS 7 Time Synchronization" (https://
support.industry.siemens.com/cs/ww/en/view/109485963) manual.
Configuration of the hardware (AS and I/O)
6.3 Settings for CP443-1 as a plant bus interface
Compendium Part A - Configuration Guidelines (V8.2)
104 Configuration Manual, 08/2016, A5E38166869-AA
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