Commissioning
12.4 Operating and system states
S7-1500R/H redundant system
394 System Manual, 01/2024, A5E41814787-AF
The display of the primary CPU indicates the copying progress.
Table 12- 9 Copying the work memory
The backup CPU is busy accepting the data before it can also process the user program.
⑤ Making up backup CPU lag
In phase ⑤, the backup CPU catches up with the primary CPU.
The backup CPU sends a status message on its program progress to the primary CPU at each
cycle control point.
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