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Siemens SIMATIC S7-1500T System Manual

Siemens SIMATIC S7-1500T
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Commissioning
12.4 Operating and system states
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
405
STOP → STARTUP
Transition
Description
Effects
System state
transition
STOP → STARTUP
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 switch the mode selector 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 the startup
blocks.
The backup CPU remains in STOP.
The primary CPU clears
the non-retentive
memory and resets the
contents of non-
retentive data blocks to
the initial values of the
load memory. Reten-
tive memory and reten-
tive DB contents are
retained.
If there is a role change
between primary and
backup CPU, connected
IO devices are tempo-
rarily unavailable.
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 switch the mode selector from STOP to RUN.

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Siemens SIMATIC S7-1500T Specifications

General IconGeneral
BrandSiemens
ModelSIMATIC S7-1500T
CategoryController
LanguageEnglish

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