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4.4.1 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.
When the loop test is performed using a peripheral connected to the remote master station in the system above, where
IN connector and OUT connector of the station number 3 are connected inversely, the following window appears. The
station number 3 is detected as a receive direction faulty station.
● 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 of the MELSECNET/H
(MELSECNET/10 mode) remote I/O station.
( Q Corresponding MELSECNET/H Network System Reference Manual (Remote I/O network))
● During the loopback, stations where the loopback is being performed can be checked in the "Loop status of each station"
window opened from the "Other station information" window. ( Page 77, Section 7.2.2)
Peripheral Station No.0
Remote master station
Station No.2
Loopback
Station No.3
Faulty station
Station No.1
Loopback
Station No.4
Reserved station
OUTIN
OUT IN OUT IN OUTIN
OUTIN