Station Order Check Test (Optical Loop System Only) - Mitsubishi QJ71LP21 Reference Manual

4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION

4.10.3 Station order check test (optical loop system only)

Station No. 3 is
not displayed
because it is a
reserved station.
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This test checks the connected station numbers in the optical loop system.
The following connection orders can be checked by the loop status (displayed on the
station order check test result screen. See the monitor screen below.) when this test is
conducted.
Loop status
The station numbers connected in the direction of the forward loop from the host as well as
Forward and reverse loops
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
For example, in the following system, when the station order check test is conducted
by the GX Developer connected to remote master station, the monitor screen shown
below is displayed to verify that a loopback is being executed between station numbers
4 and 2 that are connected in the direction of the forward loop.
GX Developer
Remote
master station
Station
IN OUT
OUT
Station
Reverse loop direction
Forward loop direction
Reserved station
Station
No. 0 No. 3
IN OUT
IN OUT IN
Station
No. 1 No. 7
Display
Loopback
Station
Station
No. 4
No. 6
IN OUT
IN OUT
OUT IN
OUT IN
Station
Station
No. 2
No. 5
Loopback Faulty station
MELSEC-Q
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