Siemens S5-135U/155U User Manual
Page 190
5-50
System Manual
C79000-G8576-C199-06
ADF LED
on
The user program has referenced an I/O address in the
process image under which no module is inserted.
ZYK LED
on
The maximum cycle monitoring 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 928B Programming Guide.
LED SI1
LED SI2
Cause
on
on
No communication possible at both interfaces.
Internal error.
on
off
SI1:
No communication possible. Internal error.
SI2:
If used, interface is initialized and ready.
off
on
SI1:
Interface is initialized and ready.
SI2:
No communication possible.
Wrong interface submodule inserted or wrong
parameters for interface or internal error.
off
off
First interface and, if used, second interface are
initialized and ready.
CPUs, Memory Cards, Memory Submodules, Interface Submodules