Siemens S5-135U/155U appendix LEDs for Fault Indication Signaling

CPUs, Memory Cards, Memory Submodules, Interface Submodules

LEDs for Fault

Indication and

Signaling

QVZ LED

on

During direct access or process image update, a module addressed by the program no longer acknowledges although

Seither it has acknowledged in single processor operation upon reset of the CPU 928 in the area of the process image (IB 0 to 127, QB 0 to 127) and has been entered as present in the ª9th trackº (see Programming Guide, CPU 928),

Sor it has been entered in DB 1 (address list) in multiprocessor or single-processor operation and has been recognized as present during the reset.

Possible causes

SModule failure.

SModule was pulled out during operation, in the stop state or in the Off state without a subsequent reset.

ADF LED

on

The user program has referenced an I/O address under which no module is inserted.

ZYK LED

on

The maximum cycle time has been exceeded.

BASP LED

on

Command output is inhibited and the digital outputs will be directly switched to the safe state.

A detailed description of interrupt and error handling can be found in the CPU 928 Programming Guide.

5-68	System Manual
	C79000-G8576-C199-06