Siemens S5-135U/155U Setting the coordinator mode switch to RUN or Test, Then Reaction, Start

Multiprocessor Operation/Coordinators

Step 8 Setting the coordinator mode switch to RUN or TEST:

IF ...

THEN ...

Reaction

You do not wish to work in the test mode 1)

Set the coordinator mode switch from STOP to RUN.

The green RUN LEDs of all CPUs are continuously lit. All CPUs simultaneously go into the cycle. The output inhibit signal is not emitted (BASP LED = off).

You wish to work in the test mode (it must be enabled on the coordinator) 1)

Set the coordinator mode switch from STOP to TEST.

Set the coordinator mode switch from STOP to TEST.

	1) Test mode and setting: see Section 6.3
Possible Faults	Symptom:
	All CPUs remain in the Stop state.
	Remedy:
	Check whether the mode switches of all CPUs are set to RUN.
	A subsequent start of individual CPUs is not possible. Switch the coordinator
	back to STOP. Execute a RESET at all CPUs and then switch the coordinator
	to RUN again.
	Note
	During the starting phase (processing of the start OBs) the STOP and RUN
	LEDs remain off at all CPUs. The RUN LED only lights up continuously
	when the CPUs go over to cyclic program processing.

Notes Relating to
Multiprocessor	S When the coordinator is switched from STOP to TEST, only the CPUs
Start	whose switches are at the RUN setting will operate in the test mode.
	S If the 923C coordinator is used and the PG interface on the front plate is
	not connected to the PG and switched online, the IF FAULT LED lights
	up on the 923C coordinator. The indicator can be ignored in this case.

6-12	System Manual
	C79000-G8576-C199-06