Siemens SIMATIC S7-1500 System Manual page 408

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