Technical data

Appendix
27.1 Operating Modes
Programming with STEP 7
Manual, 05/2010, A5E02789666-01 559
Transition Description
8. The CPU changes back to STOP mode when:
• An error is detected in RUN mode and the corresponding OB is not loaded.
• The CPU is changed to STOP by the key switch or on the programming device.
• A stop command is edited in the user program.
• The STOP communication function is executed.
9. The CPU changes to RUN mode when a breakpoint was set and the "EXIT HOLD" command
is executed.
10. The CPU changes to HOLD mode when a breakpoint is reached in the user program.
Operating Mode Priority
If a number of operating mode transitions is requested simultaneously, the operating mode with the
highest priority is selected. If, for example, the mode selector is set to RUN and you attempt to set
the CPU to STOP at the programming device, the CPU will change to STOP because this mode
has the highest priority.
Priority Mode
Highest STOP
HOLD
STARTUP
Lowest RUN