Siemens SIMATIC S5 ET 200U - 4.3.1 Using LEDs to Diagnose Problems

4-26
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
4.3.1 Using LEDs to Diagnose Problems
Figure 4-8 Fault LEDs on the ET 200U Interface Module
Table 4-7 LED Fault Messages on ET 200U Interface Module
LED Optical
Signal
Explanation
RUN Lit Normal operation (load voltage supply
available)
BUS–FAULT Lit
 Response time has run out and the
IM 318–B interface module was not ad-
dressed.
 During system start–up or power up:
IM 318–B not parameterized yet.
 No connection between SINEC L2–DP
bus and slave station.
IM–FAULT Lit or
flashing
There is a fault in the I/O bus (e.g. a bus
unit is defective).
BUS–FAULT
and
IM–FAULT
Lit
There is a hardware fault in the ET 200U
interface module.
BUS–FAULT
and
IM–FAULT
Flashing
The configured station address is not within
the permitted range (3 to 124).
ET 200U(DP Siemens): AddressAssignment,Starting–Up,Diagnosing Faults Using COMET200