Siemens S5-135U/155U appendix No communication possible at both interfaces, Internal error

CPUs, Memory Cards, Memory Submodules, Interface Submodules

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

on

on

off

off

LED SI2	Cause
on	No communication possible at both interfaces.
	Internal error.
off	SI1:
	No communication possible. Internal error.
	SI2:
	If used, interface is initialized and ready.
on	SI1:
	Interface is initialized and ready.
	SI2:
	No communication possible.
	Wrong interface submodule inserted or wrong
	parameters for interface or internal error.
off	First interface and, if used, second interface are
	initialized and ready.

5-50	System Manual
	C79000-G8576-C199-06