Using Leds To Diagnose Problems - Siemens SIMATIC S5 ET 200U Manual

ET 200U(DP Standard/FMS): Modes, Settings and Comm. Capabilities of IM 318–C
6.4

Using LEDs to Diagnose Problems

Figure 6-3 Fault LEDs on the ET 200U Interface Module
The following table explains the meanings of the fault LEDs:
Table 6-39
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
LED Fault Messages from ET 200U
LED Optical
Signal
RUN Lit
BUS–FAULT Lit
IM–FAULT Lit or flas-
hing
BUS–FAULT
und Lit
IM–FAULT
BUS–FAULT
und Flashing
IM–FAULT
Explanation
Normal operation (load voltage supply
available)
No FMS link established
The following three fault messages are
valid only if a DP master is also con-
nected to the bus:
Response time has run out and the ET
200U was not addressed.
During system start–up or power up:
ET 200U not yet parameterized.
No connection between bus and
ET 200U.
Fault in the I/O bus
(e.g. bus unit defective)
Hardware fault in the ET 200U interface
module
The configured station address is not within
the permitted range (1 to 125)
6-35