Commissioning
9.4 Operating and system states
S7-1500R/H redundant system
222
System Manual, 10/2018, A5E41814787-AA
⑥
SYNCUP → RUN
-Redundant, RUN-
Syncup → RUN
-Redundant
Transition
Description
Effects
System state
transition
SYNCUP → RUN
-Redundant
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.
This system state tran-
sition does not have
any effect on data.
Operating state
transitions
RUN-
Syncup →
RUN-Redundant
The primary CPU switches from the RUN-Syncup operating state to the
RUN-Redundant operating state if SYNCUP has successfully run.
Communication con-
nections (HMI, PG/PC)
on the backup CPU
become available.
Both CPUs process the
user program synchro-
nously.
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
Effects
System state
transition
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 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.
This system state tran-
sition has effects on
the diagnostics 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.
Summary of Contents for Simatic S7-1500H
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