Automatic restart
The following is required for the automatic restart:
● Automatic restart has to be activated for all applications that are take part in process mode.
● All process mode data are synchronized between the servers.
If a redundancy error occurs on one server following the automatic restart, note the following:
If a new redundancy error occurs within the first hour that this computer again takes part in
process mode, no automatic restart is executed.
Note
Restart
The automatic restart is also limited to 3 restarts. The counter is reset after 3 hours. At least
3 hours have to pass before the counter is reset following the third restart. If a restart is triggered
hourly due to an error, an autoreboot is no longer executed following the 3rd error (because it
has not been 3 hours without autoreboot)
Delayed reaction to errors
A double error can result in a delayed reaction by the server.
Example:
● Error 1: The partner server is not available or cannot be reached.
● Error 2: An additional error occurs during process mode (e.g. terminal bus cable pulled).
● Reaction:
– The computer first remains MASTER.
– An error is reported.
– The reaction to the error is delayed.
– Only when the partner server is recognized and all data are synchronized does the
dialog "Restart request" appear.
Note:
As long as the process mode data from WinCC or SIMATIC BATCH are not
synchronized, the server remains in the status MASTER.
Failure, switchover and reintegration of high availability components
7.13 Redundancy behavior of the PCS 7 OS, SIMATIC BATCH and SIMATIC Route Control servers
High Availability Process Control Systems (V9.0)
242 Function Manual, 05/2017, A5E39221836-AA
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