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MELSEC-Q
4 SETTING AND PROCEDURE BEFORE OPERATION
4.10.1 Loop test (optical loop system only)
This test checks the line status (forward loop or reverse loop) after all stations are
connected to the optical loop system.
GX Developer
Station
No. 0
Reserved station
Loopback
Faulty station
IN OUT
Loopback
Station
No. 3
IN OUT
Station
No. 6
IN OUT
Station
No. 4
IN OUT
INOUT
Station
No. 1
INOUT
Station
No. 7
INOUT
Station
No. 2
OUTIN
Station
No. 5
Remote
master station
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 8.2.9.