Startup
The modules must be inserted at the correct slots in the central
controller. The backup battery must be fitted and in order for the CPU
to start.
Overall reset
Step
Action
Result
1
Set the mode switch to
STOP.
2
Switch the system voltage
on.
The following LEDs must light
up on the CPU:
-
Red STOP LED (flashing
rapidly)
-
Red BASP LED
3
Hold the MC
1)
switch in
the OVERALL RESET
setting and simultaneously
set the mode switch from
STOP to RUN.
The red STOP LED is now
permanently lit.
1)
MC: Momentary-contact
Reset
Step
Action
Result
4
Set the mode switch to
STOP.
5
Hold the MC switch in the
RESET setting and
simultaneously set the
mode switch from STOP
to RUN.
-
Red STOP LED goes off
-
Green RUN LED lights up
-
Red BASP LED goes off
The CPU is now in the RUN
state but still has no user
program.
Restart
You can also carry out a manual restart of the CPU 922 with the
mode switch. The CPU 922 Programming Guide will indicate when a
manual restart is permissible.
Step
Action
Result
1
Set the mode switch from
STOP to RUN.
-
Red STOP LED goes off
-
Green RUN LED lights up
-
Red BASP LED goes off
For maintenance purposes or in the event of a fault, this startup
without user program in single-processor operation can serve to
establish whether the CPU is operating without errors.
CPU 922
System Manual
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C79000-B8576-C199-03