Commissioning
12.4 Operating and system states
S7-1500R/H redundant system
412 System Manual, 01/2024, A5E41814787-AF
Response
Loss of redundancy of CPU means:
• The redundant system switches from the RUN-Redundant system state to the RUN-Solo
system state.
• The primary CPU switches from the RUN-Redundant operating state to RUN (1)
or
• Primary-backup switchover: The backup CPU becomes the primary CPU and switches from
the RUN-Redundant operating state to RUN (2).
The primary CPU continues to execute the user program in the RUN operating state and
exchanges process data with the IO devices.
Causes of loss of redundancy of CPU
The redundant system switches from the RUN-Redundant system state to RUN-Solo if:
• You POWER OFF one of the CPUs.
• You set one of the two CPUs to STOP with the PG/PC, the display, the RH_CTRL instruction
(Mode 8/9) or the mode selector.
• A CPU detects an error that prevents continued processing, for example:
– Failure of a CPU, for example as a result of a hardware defect.
– S7-1500R: Failure of a central module, for example as a result of a hardware defect of a
CP.
– Cycle time exceeded
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