Mitsubishi QJ71LP21 User Manual

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MELSEC-Q
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
4.10.3 Station order check test (optical loop system only)
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 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
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.
Forward loop direction
Reverse loop direction
Station
No. 0
Reserved station
Loopback
IN OUT
Station
No. 3
IN OUT
Station
No. 6
IN OUT
Station
No. 4
IN OUT
Faulty stationLoopback
INOUT
Station
No. 1
INOUT
Station
No. 7
INOUT
Station
No. 2
INOUT
Station
No. 5
Remote
master station
GX Developer
Station No. 3 is
not displayed
because it is a
reserved station.

Mitsubishi QJ71LP21 Specifications

General

Brand	Mitsubishi
Model	QJ71LP21
Category	Controller
Language	English