Siemens SENTRON VL Series System Manual page 40

3WL air circuit breakers
3.2 COM15 module and BSS module
CubicleBUS LED
The CubicleBUS LED shows the status of the CubicleBUS communication of the COM15
module.
Table 3- 5
Two LEDs must be considered for assessing a functional CubicleBUS in the switch:
● The "COMM" LED on the trip unit must be green, that is, at least one other CubicleBUS
node must be detected from the perspective of the trip unit.
At the least, this is only the metering function/metering function PLUS, if the CubicleBUS
has been subsequently interrupted.
● The CubicleBUS LED on the COM15 must then be considered. If this shows a steady
green light, there is a connection from the COM15 at least to the metering
function/metering function PLUS.
● If both LEDs show a green light (steady light from CubicleBUS on the COM15 module
and COMM on the trip unit), there is continuous communication between the trip unit, the
COM15 and PROFIBUS DP.
Data exchange via PROFIBUS DP
Data exchange then functions as follows:
● An up-to-date image of all the data of the SENTRON WL (with the exception of the
waveform buffer) is always stored in the COM15 module. Consequently, a data query
from the COM15 module to the PLC can be answered within just a few milliseconds.
● Write data from the PLC is forwarded to the correct addressee on the CubicleBUS.
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CubicleBUS LED
CubicleBUS LED
Off
Red
Flashing green
Steady green light
No CubicleBUS module found
CubicleBUS fault
A CubicleBUS node has been found but no metering
function/metering function PLUS, and no trip unit
CubicleBUS node found and connection with metering
function/metering function PLUS, and/or trip unit
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
Meaning