Siemens SIMATIC S7-1500/ET 200MP System Manual page 270

The table below shows the effects of the operating mode transitions:
Table 12- 3 Operating mode transitions
No. Operating mode transitions
① POWER ON →
STARTUP
② POWER ON → STOP
③ STOP → STARTUP
④ STARTUP → STOP
Automation system
System Manual, 01/2023, A5E03461182-AK
After switching on, the CPU switches to "STARTUP"
mode if:
• The hardware configuration and program blocks are
consistent.
• The preceding "POWER OFF" was triggered by an
interruption in the power supply.
• 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.
The CPU switches to "STARTUP" mode if:
• The hardware configuration and program blocks are
consistent.
• You set the CPU to "RUN" mode via the program-
ming device or the display and the mode switch in is
RUN position.
or
• You set the mode selector from STOP to RUN or
press the operating mode button RUN.
In the following cases the CPU returns from "STARTUP"
to "STOP" mode when:
• The CPU detects an error during startup.
• You set the CPU to "STOP" via the programming
device, display or mode selector switch / keys.
• The CPU executes a STOP command in the Startup
OB.
Effects
The CPU clears the non-retentive
memory, and resets the content
of non-retentive DBs to the start
values of the load memory. Reten-
tive memory and retentive DB
contents are retained.
The 500 newest entries in the
diagnostics buffer are retained.
The CPU clears the non-retentive
memory, and resets the content
of non-retentive DBs to the start
values of the load memory. Reten-
tive memory and retentive DB
contents are retained.
The 500 newest entries in the
diagnostics buffer are retained.
The CPU clears the non-retentive
memory, and resets the content
of non-retentive DBs to the start
values of the load memory. Reten-
tive memory and retentive DB
contents are retained.
The 500 newest entries in the
diagnostics buffer are retained.
1)
These operating mode transitions
have no effect on data.
1)
Commissioning
12.5 Operating modes
269