Mitsubishi LJ61BT11 User Manual page 285

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12 EXAMPLE OF COMMUNICATION BETWEEN THE MASTER STATION AND LOCAL STATIONS
(2) Confirming the operation with the program
Using the program, confirm that the data link is being performed normally.
1) When X20 of the master station is turned on, Y41 of the local station turns
on.
2) When X21 of the local station is turned on, Y40 of the master station turns
on.
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