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MELSEC-Q
4 SETTING AND PROCEDURE BEFORE OPERATION
4.10.3 Station order check test (optical loop system only)
This test checks the order of connected stations in the optical loop system.
The following table lists the correspondence between the loop status and the order of
stations that can be checked in the test.
Loop status Display
Forward and reverse loops
The station numbers connected in the direction of the forward loop from the host as well as
the station numbers connected to the direction of the reverse loop from the host
Forward loop Only the station numbers connected in the direction of the forward loop from the host
Reverse loop Only the station numbers connected in the direction of the reverse loop from the host
Loop back Only the station numbers connected in the direction of the forward loop from the host
When the station order check test is performed using GX Developer connected to the
remote master station in the system above, the following screen appears. The result
shows that the loopback is performed in the stations, the station number 4 and 2,
connected in the forward loop direction.
Station No. 3 is
not displayed
because it is a
reserved station.