Siemens S5-135U/155U - Manual (Page 151)

5-11
System Manual
C79000-G8576-C199-06
The module must be inserted at the correct slot in the central controller. The
backup battery must be fitted and in order for the CPU to start.
Proceed as follows:
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 2) 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
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 Result
1 Set the mode switch to STOP.
2 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.
Startup
Overall Reset
Reset
CPUs, Memory Cards, Memory Submodules, Interface Submodules