Siemens SIMATIC S7-1500 System Manual page 408

Redundant system
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⑤RUN-Solo → SYNCUP, RUN → RUN-Syncup, STOP → SYNCUP
Transition
Description
System state
RUN-Solo → SYNCUP
transition
The primary CPU is in the RUN operating state. The redundant system switch-
es from the RUN-Solo system state to the SYNCUP system state if:
You set the backup CPU to RUN via the PG/PC, the display or the RH_CTRL
instruction (Mode 7) and the mode selector is set to RUN
or
You switch the mode selector on the backup CPU from STOP to RUN.
or
You POWER ON the backup CPU (mode selector to RUN).
and
the SYNCUP system state is not disabled by the RH_CTRL instruction.
Operating state
RUN → RUN-Syncup
transitions
The primary CPU switches from the RUN operating state to the RUN-Syncup
operating state if:
You set the backup CPU to RUN via the PG/PC or the display and the mode
selector is set to RUN
or
You switch the mode selector on the backup CPU from STOP to RUN.
or
You POWER ON the backup CPU (mode selector to RUN).
STOP → SYNCUP
The backup CPU switches from the STOP operating state to the SYNCUP oper-
ating state.
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
Commissioning
12.4 Operating and system states
Effects
See section SYNCUP
system state
(Page 388)
407

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