Siemens Simatic S7-1500R System Manual page 222

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RUN-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
switches from the RUN-Solo system state to the SYNCUP system state if, for
example:
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)
•
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
operating state.
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA
Commissioning
9.4 Operating and system states
Effects
See section SYNCUP
system state
(Page 205)
The backup CPU gets
all static and dynamic
data from the primary
CPU.
After successful
SYNCUP, the memory
content is identical on
the two CPUs.
The updated backup
CPU catches up with
primary CPU program
execution.
You have only limited
access to online func-
tions during SYNCUP.
You can find more
information in the sec-
tion Test functions
(Page 282).
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