The display of the backup CPU shows the "Connecting..." state.
Table 11-7Restart of the backup CPU
Primary CPU Backup CPU
Step 2 of 5
Waiting for restart
of the Backup PLC.
RUN-Syncup
Syncup...
?
?
6ES7 517-3HP00-0AB0
CPU 1517H-3 PN
CONNECTING...
Overview
OK
③ Finishing tasks
The instructions running asynchronously on the primary CPU are terminated and new ones
are accepted but not started.
From this point on, restarted asynchronous instructions are delayed until the "Copying the
working memory" phase. The "BUSY" output parameter of instructions is"1". However,
processing does not yet start.
274
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
Commissioning
11.4 Operating and system states
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