Device configuration
6.10 Time synchronization
S7-1200 Programmable controller
182 System Manual, V4.2, 09/2016, A5E02486680-AK
When you activate time synchronization in a module, the Engineering Station (ES) prompts
you to select the "CPU synchronizes the modules of the device." if you have not already
selected the check box in the CPU’s "Time synchronization" dialog. The ES also warns you if
you configured more than one master clock source for time synchronization (for example,
you activated time synchronization on more than one CP or on both the CPU and a module).
Note
Activating time synchronization on a CP causes the CP to set the CPU’s clock. Selecting the
"CPU synchronizes the modules of the device" check box in the CPU’s "Time
synchronization" dialog causes the CP modules to automatically synchronize to the CPU’s
clock.
Note
You should assign only one time source for the control system.
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