Commissioning
8.4 Operating modes
S7-1500 Automation System
100 System Manual, 01/2013, A5E03461182-01
The following table shows the conditions under which the operating modes change:
Table 8- 1 Operating mode conditions
No. Operating mode
transitions
Conditions
①
POWER ON →
STARTUP
After switching on, the CPU goes into "STARTUP" mode, if:
• The hardware configuration and program blocks are consistent.
• The start-up type "Warm restart RUN" is set
or
the start-up type "Warm restart operating mode before POWER
OFF" is set and was in RUN mode before POWER OFF.
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.
②
POWER ON → STOP After switching on, the CPU goes to "STOP" mode if:
• The hardware configuration and program blocks are consistent
or
• the "No restart" startup type is set.
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.
③
STOP → STARTUP The CPU goes into the "STARTUP" operating mode, if:
• The hardware configuration and program blocks are consistent.
• The CPU is set to "RUN" by the programming device or via the
display and the mode selector are in the RUN position
or
• the mode selector is switched from STOP to RUN.
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.
④
STARTUP → STOP The CPU returns to the "STOP" operating mode in the following cases
of "START-UP":
• An error is detected during start-up.
• The CPU is set to "STOP" mode from the programming device.
• A STOP command is executed in the Startup OB.
⑤
STARTUP → RUN The CPU goes to the "RUN" mode in the following cases of
"START-UP":
• The CPU has initialized the PLC tags.
• The CPU has executed the startup blocks successfully.
⑥
RUN → STOP The CPU returns to the "STOP" operating mode in the following cases
of "RUN":
• An error is detected that prevents continued processing.
• A STOP command is executed in the user program.
• The CPU is set to "STOP" mode from the programming device, the
display or the mode selector.
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