Siemens S5-135U/155U System Manual page 165

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
Proceed as follows:
Step
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.
Reset
Continue as follows:
Step
System Manual
C79000-G8576-C199-06
CPUs, Memory Cards, Memory Submodules, Interface Submodules
Action
1 Set the mode switch to STOP.
2 Switch the system voltage on. The following LEDs must light
1)
3 Hold the MC switch in the
OVERALL RESET setting
and simultaneously set the
mode switch from STOP to
RUN.
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.
Resultat
up on the CPU:
– Red STOP LED (flashing
rapidly)
– Red INIT LED, briefly
2)
– Red BASP LED
Die rote LED "STOP" zeigt nun
Dauerlicht.
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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