Siemens S5-135U/155U User Manual
Page 208
5-68
System Manual
C79000-G8576-C199-06
QVZ LED
on
During direct access or process image update, a module
addressed by the program no longer acknowledges although
S
either 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 “9th track” (see Programming Guide,
CPU 928),
it h
b
t
d i DB 1 ( dd
li t) i
S
or 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
S
Module failure.
S
Module 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.
LEDs for Fault
Indication and
Signaling
CPUs, Memory Cards, Memory Submodules, Interface Submodules