Siemens Simatic S7-1500 / ET 200MP - Page 270

Commissioning
12.5 Operating modes
Automation system
System Manual, 01/2023, A5E03461182-AK
269
The table below shows the effects of the operating mode transitions:
Table 12- 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.
• 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.
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.
② POWER ON → STOP 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 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.
③
STOP → STARTUP
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.
1)
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.
④
STARTUP → STOP
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.
1)
• The CPU executes a STOP command in the Startup
OB.
These operating mode transitions
have no effect on data.