Startup - Siemens S5-155U System Manual

CPU 922

Startup

Overall reset
Reset
Restart
5 - 50
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.
Step Action
1 Set the mode switch to
STOP.
2 Switch the system voltage
on.
1)
3 Hold the MC switch in
the OVERALL RESET
setting and simultaneously
set the mode switch from
STOP to RUN.
1)
MC: Momentary-contact
Step Action
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.
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
1 Set the mode switch from
STOP to RUN.
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.
Result
The following LEDs must light
up on the CPU:
- Red STOP LED (flashing
rapidly)
- Red BASP LED
The red STOP LED is now
permanently lit.
Result
- 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.
Result
- Red STOP LED goes off
- Green RUN LED lights up
- Red BASP LED goes off
System Manual
C79000-B8576-C199-03