Siemens Simatic S7-1500R System Manual page 223

Commissioning
9.4 Operating and system states
⑥
SYNCUP → RUN-Redundant, RUN-Syncup → RUN-Redundant
Transition Description
System state SYNCUP → RUN-Redundant
transition
The redundant system switches from SYNCUP to the RUN-Redundant sys-
tem state if SYNCUP has successfully run.
In the RUN-Redundant system state, the two CPUs execute the user pro-
gram synchronously.
Note: A temporary increase in the cycle time can occur upon a system state
transition SYNCUP → RUN-Redundant. Configure a sufficiently long maxi-
mum cycle time for the CPUs.
Operating state RUN-Syncup → RUN-Redundant
transitions
The primary CPU switches from the RUN-Syncup operating state to the
RUN-Redundant operating state if SYNCUP has successfully run.
SYNCUP → RUN-Redundant
The backup CPU switches from the SYNCUP operating state to the RUN-
Redundant operating state if SYNCUP has successfully run.
⑦
RUN-Redundant → RUN-Solo, RUN-Redundant → RUN
Transition Description
System state RUN-Redundant → RUN-Solo
transition
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 that prevents continued processing, for example
•
a hardware defect
or
You set one of the CPUs to STOP with the PG/PC, the display or the
•
mode selector.
The primary CPU switches to RUN or the backup CPU becomes the primary
CPU and switches to RUN.
Operating state RUN-Redundant → RUN
transition
The primary CPU switches from the RUN-Redundant operating state to the
RUN operating state and continues to execute the user program.
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Effects
This system state tran-
sition does not have
any effect on data.
Communication con-
nections (HMI, PG/PC)
on the backup CPU
become available.
Both CPUs process the
user program synchro-
nously.
Effects
This system state tran-
sition has effects on
the diagnostics data.
This operating state
transition does not
have any effect on
data.
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA