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

4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION

4.8.3 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. Refer to the monitor screen below.) when this
test is conducted.
Loop status
Forward and reverse loops
Forward loop
Reverse loop
Loop back
For example, in the following system, when the station order check test is conducted
by GX Developer connected to station number 1, 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
Station
IN OUT
OUT
Station
Reverse loop direction
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
Only the station numbers connected in the direction of the forward loop from the host
Only the station numbers connected in the direction of the reverse loop from the host
Only the station numbers connected in the direction of the forward loop from the host
Forward loop direction
Reserved station
Station
No. 1 No. 3
IN OUT
IN OUT IN
Station
No. 8 No. 7
Display
Loopback
Station
Station
No. 4
No. 6
IN OUT IN OUT
OUT IN
OUT IN
Station
Station
No. 2
No. 5
Faulty station
Loopback
MELSEC-Q
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