Siemens Simatic ET200pro

Commissioning
7.4 Operating modes of the CPU
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
80 Operating Instructions, 09/2016, A5E35873416-AA
No.
Operating mode transitions
Effects
③
STOP → STARTUP The CPU switches to "STARTUP" mode if:
• The hardware configuration and pro-
gram blocks are consistent.
• You set the CPU to "RUN" mode via
the programming device and the mode
switch in is RUN position.
or
•
You set the mode switch 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" mode in
the following cases of "STARTUP":
• The CPU detects an error during
startup
• You set the the CPU to "STOP" via the
programming device or mode switch.
• 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" mode in
the following cases of "RUN":
• An error is detected that prevents
continued processing.
• A STOP command is executed in the
user program.
• You set the the CPU to "STOP" via the
programming device or mode switch.