Operating Mode Transitions - Siemens SIMATIC S7-1500 Operating Instructions Manual

6.2.2

Operating mode transitions

Operating modes and operating mode transitions
The following figure shows the operating modes and the operating mode transitions:
Figure 6-1
The following table shows the conditions under which the operating modes change:
Table 6- 1
No. Operating mode
①
②
③
CPU 1505SP (F) Ready4Linux Version 2.7
Operating Instructions, 05/2019, A5E46864285-AA
Operating modes and operating mode transitions
Operating mode conditions
Conditions
transitions
POWER ON → After switching on, the CPU goes to "STARTUP" mode if:
STARTUP
•
•
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.
POWER ON → STOP After switching on, the CPU goes to "STOP" mode if:
•
•
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.
STOP → STARTUP The CPU goes to "STARTUP" mode if:
•
•
•
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.
The hardware configuration and program blocks are consistent.
The start-up type "Warm restart - RUN" is set
or
the start-up type "Warm restart - mode before POWER OFF" is set
and RUN mode was active before POWER OFF.
The hardware configuration and program blocks are not consistent
or
the "No restart" startup type is set or
The hardware configuration and program blocks are consistent.
The CPU is set to "RUN" by the programming device and the mode
switch is in the RUN position
or
the mode selector is switched from STOP to RUN.
Operation of the CPU
6.2 Operating modes
65