Siemens Simatic ET200pro

Commissioning
7.4 Operating modes of the CPU
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 09/2016, A5E35873416-AA
79
7.4.5
Operating mode transitions
Operating modes and operating mode transitions
The following figure shows the operating modes and the operating mode transitions:
Figure 7-5 Operating modes and operating mode transitions
The table below shows the effects of the operating mode transitions:
Table 7- 3 Operating mode transitions
No.
Operating mode transitions
Effects
①
POWER ON → STARTUP After switching on, the CPU switches to
"STARTUP" mode if:
• The hardware configuration and pro-
gram blocks are consistent.
• Startup type "Warm restart - RUN" is
set
or
• Startup type "Warm restart mode be-
fore POWER OFF" is set and the CPU
was in RUN mode before POWER
OFF.
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 retentive DB
contents are retained.
②
POWER ON → STOP After switching on, the CPU goes to
"STOP" mode if:
• The hardware configuration and pro-
gram blocks are inconsistent
or
• Startup type "No restart" is set
or
• Startup type "Warm restart mode be-
fore POWER OFF" is set and the CPU
was in RUN mode before POWER
OFF.
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 retentive DB
contents are retained.