Startup - Siemens S5-155U System Manual

Startup

Overall reset
Restart
System Manual
C79000-B8576-C199-03
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.
Proceed as follows:
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
2)
BASP: Command output inhibit
If the red SYS FAULT LED also lights up, an error has occurred
during overall reset. In this case the measures described must be
repeated. If necessary, switch the system voltage off and on again.
If the LED is still lit, the module is faulty.
Continue as follows:
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.
CPU 948
Result
The following LEDs must light
up on the CPU:
- Red STOP LED (flashing
rapidly)
- Red INIT LED, briefly
2)
- 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.
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