4.10 Time synchronization
Introduction
Time synchronization in a PCS 7 plant is of utmost importance for synchronizing, tracing,
documenting and archiving all time-critical processes. Time synchronization is particularly
important for the redundancy functions in PCS 7 such as the redundancy synchronization
between OS servers or BATCH servers.
Time synchronization is active after one component has assumed the time master function in
a PCS 7 system. All other time-dependent components receive the time from this time master.
Planning and setting up time synchronization in PCS 7
The information necessary for planning and setting up time synchronization within a Windows
network is available in the following documentation:
Function manual
Process Control System PCS 7; PCS 7 Time Synchronization
Setting the time synchronization of SIMATIC H stations
When a SIMATIC H station is connected to the redundant high availability plant bus each with
two CP443-1 per CPU, the settings for time synchronization should be made according to the
table below.
Set the time synchronization of CP 443-1 by selecting the "Time synchronization" tab in the
object properties dialog of the CP.
Bus CPU 1/rack 1 CPU 2/rack 2
Plant bus1 CP 1/1 Time synchronization ena‐
bled
CP 2/1 Time synchronization disa‐
bled
Plant bus2 CP 1/2 Time synchronization dis‐
abled
CP 2/2 Time synchronization ena‐
bled
High availability solutions in PCS 7
4.10 Time synchronization
High Availability Process Control Systems (V9.0)
Function Manual, 05/2017, A5E39221836-AA 105
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