⑦RUN-Redundant → RUN-Solo, RUN-Redundant → RUN
Transition Description Effects
System state trans
ition
RUN-Redundant → RUN-Solo
The redundant system switches from the RUN-Redundant system state to the
RUN-Solo system state (loss of redundancy) if:
• You POWER OFF one of the CPUs.
or
• A CPU detects an error which prevents further work.
or
• The cycle time was exceeded once, see section Events and OBs (Page 220)
or
• You set one of the CPUs to STOP with the PG/PC, the display, the RH_CTRL
instruction (Mode 8/9) or the mode selector.
The primary CPU switches to RUN or the backup CPU becomes the primary CPU
and switches to RUN.
This system state trans
ition does not have any
effect on the data.
Operating state
transition
RUN-Redundant → RUN
The primary CPU switches from the RUN-Redundant operating state to the RUN
operating state and continues to execute the user program.
This operating state
transition does not have
any effect on data.
⑧RUN-Redundant → STOP, RUN-Solo → STOP, RUN → STOP
Transition Description Effects
System state trans
ition
RUN-Redundant → STOP, RUN-Solo → STOP
The redundant system switches from the RUN-Redundant/RUN-Solo system
state to the STOP system state if:
• The redundant system detects an error that prevents further processing
or
• The redundant system processes a STOP command in the user program
or
• You set the redundant system to STOP with the PG/PC.
This system state trans
ition does not have any
effect on data.
RUN-Redundant → STOP, RUN → STOP
The primary CPU switches from the RUN-Redundant/RUN operating state to the
STOP operating state if:
• The CPU detects an error that prevents further work on one of the two
CPUs.
or
• You set the CPU to STOP with the PG/PC, the display or the mode selector.
Operating state
transitions
RUN-Redundant → STOP
The backup CPU switches from the RUN-Redundant operating state to the STOP
operating state.
These operating state
transitions have no
effect on data.
287
Commissioning
11.4 Operating and system states
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD
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