Siemens S5-135U/155U appendix Overall Reset, Step Action Result Set the mode switch to Stop

CPUs, Memory Cards, Memory Submodules, Interface Submodules

Startup	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.
Overall Reset	Proceed as follows:

Step

1

2

Action	Result
Set the mode switch to STOP

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.

Reset	Continue as follows:
	Step	Action

Result

1

2

Set the mode switch to STOP.

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.

System Manual	5-11
C79000-G8576-C199-06