Technical data
Fundamentals
2.7 Time synchronization in PCS 7 - mode of operation
Time synchronization (V7.1)
Function Manual, 03/2009, A5E01216578-01
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2.7.3 Example of the time synchronization sequence
Introduction
The example below shows an example of time synchronization in PCS 7, based on
configurations for an OS.
Note
The individual components are identified in the figures below as follows:
• Dashed line starting at a component
Components with red dashed lines leading away from them are time masters in this
network.
• Arrow pointing to a component
Components to which an arrow is pointing are time slaves in this network.
• (M) at a component next to a bus system
An (M) at a component next to a bus system signifies that this component is a
cooperative time master for this bus system.
Time synchronization of an OS server
In the image below, the SICLOCK is the time master for the plant. The SICLOCK provides
the time for the OS servers and automation systems.
The OS server and the automation systems are configured as time slaves of the SICLOCK.
The OS server must be the time master on the terminal bus. The OS clients are time slaves
on the terminal bus.
The OS server is the cooperative time master on the plant bus. The OS server assumes the
time master function if the connection to the SICLOCK fails.
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