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before POWER OFF.
The CPU that becomes the primary CPU runs the STARTUP.
The primary CPU switches to the STARTUP operating state.
After POWER ON →
STARTUP, the primary
CPU clears the nonretentive
memory and
resets the contents of
non-retentive data
blocks to the initial values
of the load memory.
Retentive memory and
retentive DB contents
are retained.
Operating state
transitions
POWER ON → STARTUP
The CPUs implement pairing after switch-on. The primary CPU then switches
to the STARTUP operating state if:
• The mode selector is in the RUN position;
• The hardware configuration and program blocks are consistent,
and
• The startup type "Warm restart - RUN" is set
or
• The startup type "Warm restart - Operating mode before POWER OFF"
is set and the CPU was in STARTUP, RUN, RUN-Syncup or RUNRedundant
before POWER OFF.
POWER ON → SYNCUP
The CPUs implement pairing after switch-on. The backup CPU then switches
to the SYNCUP operating state if:
• The mode selector is in the RUN position
and
• The primary CPU is in the STARTUP or RUN operating stateThe redundant system switches to the STOP system state after switch-on if:
• The mode selector is in the STOP position
or
• The hardware configuration and program blocks are inconsistent
or
• The startup type "No restart (remain in STOP)" is set
or
• The startup type "Warm restart - Operating mode before POWER OFF" is
set and the redundant system was in STOP before POWER OFF.
The primary CPU
clears the nonretentive
memory and
resets the contents of
non-retentive data
blocks to the initial
values of the load
memory. Retentive
memory and retentive
DB contents are retained.The redundant system switches to the STARTUP system state if:
• You set a CPU to RUN via the PG/PC or the display and the mode selector
is set to RUN
or
• You set the mode switch from STOP to RUN.
The CPU that you switch from STOP to RUN first remains/becomes the primary
CPU. It switches to the STARTUP operating state and processes
startup OB 100.
The backup CPU remains in STOP.
The primary CPU
clears the nonretentive
memory and
resets the contents of
non-retentive data
blocks to the initial

values of the load
memory. Retentive
memory and retentive
DB contents are retained.
Operating state
transition
STOP → STARTUP
After switch-on, the primary CPU switches to the STARTUP operating state
if:
• The hardware configuration and program blocks are consistent
and
• You set the CPU to RUN via the PG/PC or the display and the mode
selector is set to RUN
or
• You set the mode switch from STOP to RUN.The redundant system switches from STARTUP to the RUN-Solo system
state if:
• The primary CPU has initialized the PLC tags
and
• the primary CPU has executed the startup blocks successfully
and
• "Startup CPU only if compatible" is configured, there is feedback from all
IO devices before the end of the configuration time and all IO devices
match the configured hardware configuration or "Startup CPU even if
mismatch" is configured and the configuration time is up.
The backup CPU remains in STOP.
The process image is
updated and processing
of the cyclic
user program begins.
The outputs of the IO
devices are initialized.
Operating state
transition
STARTUP → RUN
The primary CPU switches to the RUN operating state if:
• The CPU has initialized the PLC tags;
• The CPU has executed the startup blocks successfully;
and
• "Startup CPU only if compatible" is configured, there is feedback from all
IO devices before the end of the configuration time and all IO devices
match the configured hardware configuration or "Startup CPU even if
mismatch" is configured and the configuration time is upThe 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.
See section SYNCUP
system state