Commissioning
10.6 Operating modes of the CPU
Reference
Further 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).
10.6.4
Operating mode transitions
Operating modes and operating mode transitions
The following figure shows the operating modes and the operating mode transitions:
Figure 10-9
The table below shows the effects of the operating mode transitions:
Table 10- 7
Operating mode transitions
No.
Operating mode transitions
①
POWER ON →
STARTUP
②
POWER ON →
STOP
③
STOP → STARTUP
186
Operating modes and operating mode transitions
After switching on, the CPU switches to "STARTUP"
mode if:
The hardware configuration and program blocks are
•
consistent.
The "Warm restart-RUN" startup type is set
•
or
The "Warm restart mode before POWER OFF" is
•
set and 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
The "No restart" startup type is set.
•
The CPU switches to "STARTUP" mode if:
The hardware configuration and program blocks are
•
consistent.
The programming device sets the CPU to "RUN"
•
and the mode selector is in the RUN setting
or
The mode selector is switched from STOP to RUN.
•
Effect
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 con-
tents 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 retentive DB con-
tents 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 retentive DB con-
tents are retained.
Distributed I/O system
System Manual, 12/2015, A5E03576849-AF