Siemens SIMATIC ET 200SP HA, System Manual

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PCS 7 Process Control System;
Time Synchronization.
Recommendation
To increase the plant-wide time synchronism, separate the network for time synchronization of
the automation systems (referred to hereinafter as the TIME-Net) from the system bus.
Separation of the system bus
● Section of the system bus for synchronization of the AS with the central system clock
– This network only connects the time master (SICLOCK TC400) and the AS to each other.
– There is a direct connection between the central system clock and the first CPU (see
figure below).
● Section of the system bus for communication of the automation systems with other systems
(e.g. engineering system; OS)
– This network is connected via a separate communication channel (e.g. CP 443-1).
The figure shows an example of the connection of an H-system to the time master.
The two parts of the figure show the difference in the connection between the example
configurations:
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Figure 4-4 Application of configurations for time stamping
Plant planning
4.9 Time synchronization and time stamping
ET 200SP HA Distributed I/O system
System Manual, 08/2019, A5E39261167-AD
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