3WL air circuit breakers
3.2 COM15 module and BSS module
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
39
Diagnosing the communication system
The COM15 has two LEDs called PROFIBUS and CubicleBUS for diagnosing
communication. The operating status for PROFIBUS DP and the CubicleBUS can be read
from these.
The figure below shows the front view of the PROFIBUS module of the SENTRON WL with
the PROFIBUS connection and the two LEDs. The lower figure shows part of the ETU45B
and its LEDs for status indication.
PROFIBUS
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ALARM
COMM.
EXTEND.
ETU45B
① Connecting terminals
② PROFIBUS LED
③ CubicleBUS LED
④ Communication LED on the trip unit
Figure 3-7 COM15 PROFIBUS module of the SENTRON WL and ETU45B
PROFIBUS LED
The PROFIBUS LED shows the status of the PROFIBUS communication of the COM15
module.
Table 3- 4 PROFIBUS LED
PROFIBUS LED Meaning
Off No voltage on the COM15
Red No communication with master class 1, even if only
master class 2 is connected.
Green PROFIBUS communication functioning
Cyclic data traffic with class 1 master
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