CPUs, Memory Cards, Memory Submodules, Interface Submodules

Fault LEDs SI1

LEDs SI1 and SI2 indicate faults in communication via interfaces SI1

and SI2

and SI2:

LED SI1

LED SI2

Cause

on

on

off

off

on

off

on

off

Communication is not possible at both interfaces. Internal fault.

SI1:

No communication possible.

Internal fault.

SI2:

Interface is initialized and ready.

LED SI2 is always off if no interface module is inserted.

SI1:

Interface is initialized and ready.

SI2:

No communication possible. Wrong module inserted or internal fault.

Both interfaces are initialized and ready.

LED SI2 is always off if no interface module is inserted.

5-10

System Manual

C79000-G8576-C199-06

Page 150
Image 150
Siemens S5-135U/155U appendix Fault LEDs SI1, SI2