Siemens SIMATIC ET 200pro - Operating Mode Transitions

Commissioning
8.4 Operating modes of the CPU
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
82 Operating Instructions, 11/2019, A5E35873416-AC
Reference
Additional information about cycle and response times is available in the Function Manual
Cycle and response times (https://support.industry.siemens.com/cs/ww/en/view/59193558
).
8.4.5 Operating mode transitions
Operating modes and operating mode transitions
The following figure shows the operating modes and the operating mode transitions:
Figure 8-5 Operating modes and operating mode transitions
The table below shows the effects of the operating mode transitions:
Table 8- 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 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.
The CPU clears the non-retentive
memory, and resets the content of
non-retentive DBs to the start values of
the load memory. Retentive memory
and retentive DB contents are re-
tained.
The 500 most recent entries are re-
tained in the diagnostics buffer.
②
POWER ON →
STOP
After switching on, the CPU goes to "STOP" mode
if:
• The hardware configuration and program
blocks are inconsistent
or
• The "No restart" startup type is set.
or
• Startup type "Warm restart mode before
POWER OFF" is set and the CPU was in RUN
mode before POWER OFF.
The CPU clears the non-retentive
memory, and resets the content of
non-retentive DBs to the start values of
the load memory. Retentive memory
and retentive DB contents are re-
tained.
The 500 most recent entries are re-
tained in the diagnostics buffer.