Device configuration
6.10 Time synchronization
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
181
The objective of time synchronization of the time-of-day clocks is to have one master clock to
which all other local clocks are synchronized. Not only are the clocks synchronized initially,
but they are re-synchronized periodically to avoid the effects of drift over time.
In the case of the S7-1200 and its local base components, only the CPU and some of the CP
modules have time-of-day clocks that may need to be synchronized. In general, the CPU’s
time-of-day clock can be synchronized to an external master clock. The external master
clock might supply the time of day using an NTP server or through a CP in the local rack of
the S7-1200 that is connected to a SCADA system which includes a master clock.
Refer to S7-1200 CPs (https://support.industry.siemens.com/cs/us/en/ps) at Siemens
Industry Online Support, Product Support for further information on all S7-1200 CPs that
support the Time sychronization function.
Setting the time-of-day clock
There are three ways to set the time-of-day clock in the S7-1200 CPU:
● Using the NTP server (Page 822)
● Using the Engineering System (ES)
● From the user program
● Using an HMI panel
You configure time synchronization of the CP modules to the CPU’s clock by selecting the
"CPU synchronizes the modules of the device." check box as shown in the following figure:
By default, neither time synchronization using the NTP server nor time synchronization of the
CP clocks to the CPU’s clock is enabled.
You configure time synchronization of the CPU’s clock and time synchronization of the CP
clocks independently. Consequently, you can enable time synchronization of the CP clocks
by the CPU when the CPU’s clock is set by any internal or external method.
You can select the update interval using the NTP server. The update interval of the NTP
server is set to 10 seconds by default.
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