Performing an
OVERALL RESET
Regardless of whether you or the system program requested the
OVERALL RESET, you perform the OVERALL RESET as follows
(initial status: STOP LED flashing quickly):
OVERALL RESET using
control elements on the CPU
Action Result
Hold the reset switch in the
OVERALL RESET position. At
the same time, change the mode
selector from STOP to RUN and
back to STOP again (refer to
Fig. 4-1).
An OVERALL RESET is
performed. The STOP LED is lit
continuously.
OVERALL RESET from the
PG
Action Result
Activate the PG function "delete
blocks".
An OVERALL RESET is
performed. The STOP LED is lit
continuously.
Note
In contrast to the CPU 946/947, you can also initiate an
OVERALL RESET on the CPU 948 in the RUN mode. In this
case, the CPU automatically changes to the STOP mode and the
OVERALL RESET is then performed.
During the OVERALL RESET, all the LEDs are unlit apart from
the INIT and BASP LEDs.
Once the OVERALL RESET is completed, the only permitted
start-up mode is then a COLD RESTART.
Loading the memory card
and calling OB 39
After performing the OVERALL RESET, the memory card is loaded
(provided it is plugged in) following which OB 39 is called.
STOP Mode
CPU 948 Programming Guide
C79000-G8576-C848-04
4 - 15
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