Technical data

4.5 RUN Mode
When the CPU has executed a RESTART (and only then) it changes
to the
RUN mode. This mode is characterized by the following
features:
Execution of the user program The user program in OB 1 or in FB 0 is executed cyclically and
additional interrupt-driven program sections can be nested in it.
Timers, counters, process
image
All the timers and counters started in the program are running, the
process image is updated cyclically.
BASP signal The BASP signal (disable command output) is inactive. All the digital
outputs are therefore enabled.
IPC flags The interprocessor communication (IPC) flags are updated cyclically
(provided this is programmed in DB1).
LEDs on the front panel of the
CPU
RUN LED: on
STOP LED: off
BASP LED: off
Note
If an AUTOMATIC or MANUAL warm restart was executed
before the CPU went into the RUN mode, the BASP LED
remains lit until the rest of the cycle has been processed and the
process image has been updated.
The
RUN mode is only possible after the RESTART mode.
Program processing levels In the RUN mode there are 13 basic program processing levels, as
follows:
•• CYCLE: the user program is executed cyclically
•• TIMED JOB: the user program is executed at fixed
times you have programmed or once at a
fixed time (clock-controlled time
interrupt)
4
RUN Mode
CPU 928B Programming Guide
C79000-B8576-C898-01
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