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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
• The CPU detects an error that prevents further work on both CPUs, for
example if the cycle time is exceeded (if there is an OB 80, not until the
3rd time the cycle time is exceeded, see section Start events (Page 153))
or
• You set the CPU to STOP with the PG/PC, the display or the mode selector.

These operating state
transitions have no
effect on data.
RUN-Redundant → STOP
The backup CPU switches from the RUN-Redundant operating state to the
STOP operating state.The redundant system switches from the SYNCUP system state to the RUNSolo
system state if:
• You execute POWER OFF for the backup CPU
or
• The redundant system detects an error during SYNCUP that prevents
redundant operation
or
• You set the backup CPU to STOP with the PG/PC, the display or the
mode selector.
This system state transition
does not have
any effect on data.
Primary CPU
operating state
transition
RUN-Syncup → RUN
The primary CPU switches from the RUN-Syncup operating state to the RUN
operating state and continues to execute the user program.
These operating state
transitions have no
effect on data.The redundant system switches from the STARTUP system state to the
STOP system state if:
• The primary CPU detects an error during startup that prevents further
processing
or
• You set the primary CPU to STOP with the PG/PC, the display or the
mode selector

or
• The primary CPU processes a STOP command in the startup OB
or
• In the CPU properties, you have set the following for startup behavior:
– Too short a configuration time for the distributed I/O and
– "Startup CPU only if compatible"
The primary CPU switches to STOP.
This system state transition
does not have
any effect on data.
Primary CPU
operating state
transition
This operating state
transition does not
have any effect on
data.The redundant system switches from the SYNCUP system state to the STOP
system state if:
• You set the primary CPU or both CPUs to STOP with the PG/PC, the
display or the mode selector.
• SYNCUP is aborted as a result of an error in the primary CPU or in both
CPUs.
This system state transition
does not have
any effect on data.
Operating state
transitions
RUN-Syncup → STOP
The primary CPU switches from the RUN-Syncup operating state to the
STOP operating state if:
• The primary CPU detects an error that prevents further processing
or
• You set the primary CPU to STOP with the PG/PC, the display or the
mode selector
or
• The redundant system processes a STOP command in the user program.
These operating state
transitions have no
effect on data.