Loop Test (Optical Loop System Only) - Mitsubishi Electric MELSEC Q Series Reference Manual

4 SETTING AND PROCEDURE BEFORE OPERATION

4.10.1 Loop test (optical loop system only)

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This test checks the line status (forward loop or reverse loop) after all stations are
connected to the optical loop system.
GX Developer
Remote
master station
OUT
When the loop test is performed using GX Developer connected to the remote master
station in the system above, where IN connector and OUT connector of the station
number 5 are connected inversely, the following screen appears. The station number 5
is detected as a receive direction faulty station.
POINT
In the loop test, the wiring status is checked after the data link has been stopped.
To check the wiring status without stopping the data link, use SW009C to SW009F.
For details, refer to Section 8.2.10.
Reserved station
Station Station
No. 0 No. 3
IN OUT IN OUT
OUT IN
IN
Station
Station
No. 7
No. 1
Loopback
Station Station
No. 6 No. 4
IN OUT IN OUT
OUT IN IN OUT
Station Station
No. 2 No. 5
Faulty station
Loopback
MELSEC-Q
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