Operating Mode Transitions - Siemens SIMATIC S7-1500 System Manual

Commissioning
10.5 Operating modes of the CPU
Reference
Additional information about cycle and response times is available in the Function Manual
Cycle and response times (http://support.automation.siemens.com/WW/view/en/59193558).
10.5.4

Operating mode transitions

Operating modes and operating mode transitions
The following figure shows the operating modes and the operating mode transitions:
Figure 10-3
The table below shows the effects of the operating mode transitions:
Table 10- 4 Operating mode transitions
N o . Op e rating mode transitions
①
POWER ON →
STARTUP
②
POWER ON →
STOP
174
Operating modes and operating mode transitions
After switching on, the CPU switches to
"STARTUP" mode if:
The hardware configuration and program
•
blocks are consistent.
Startup type "Warm restart - RUN" is set
•
or
Startup type "Warm restart mode before
•
POWER OFF" is set and the CPU was
in RUN mode before POWER OFF.
After switching on, the CPU goes to "STOP"
mode if:
The hardware configuration and program
•
blocks are inconsistent
or
Startup type "No restart" is set.
•
or
Startup type "Warm restart mode before
•
POWER OFF" is set and the CPU was
in STOP mode before POWER OFF.
Effects
Non-retentive memory is cleared, and the content
of non-retentive DBs is reset to the start values of
the load memory. Retentive memory and reten-
tive DB contents are retained.
Non-retentive memory is cleared, and the content
of non-retentive DBs is reset to the start values of
the load memory. Retentive memory and reten-
tive DB contents are retained.
System Manual, 09/2016, A5E03461182-AD
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