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4 FUNCTIONS
MELSEC-QnA
4.12.3 Station number overlap checking function
Checks whether the number of occupied stations overlap, by observing the status of
the stations actually connected during data link startup (turn on Yn6 and Yn8).
(Example)
Local station (station number 1, occupied stations: 4)
Overlap
Station 1 Station 2 Station 3 Station 4
Station 4 Station 5
Remote device station (station number 4, occupied stations: 2)
However, if the starting head number overlaps, this would not be a part of the overlap
checking.
(Example)
Local station (station number 1, occupied stations: 4)
Station 1 Station 2 Station 3 Station 4
Overlap
Station 1 Station 2
Head
Remote device station (station number 1, occupied stations: 2)
(1) When there is an overlap, the "M/S" LED flashes, and the overlap status is stored
in SW0098 to SW009B.
(2) Even if overlap exists, data link can be continued with other normally functioning
stations.
(3) By correcting the switch setting to the normal status and starting up the data link
(turn on Yn6 and Yn8) again, the "M/S" LED is turned off and the data in SW0098
to SW009B are cleared.