The master station checks that the send request bStartDirection (M0) is turned on, and transfers contents of uOutputData [0] to [3] to the send data W0 to
W3.
When the transfer is completed, the master station turns on B0.
The local station checks that B0 is turned on, and transfers contents of the receive data W0 to W3 to uInputData [0] to [3] (D100 to D103).
When the transfer is completed, the local station turns on B100.
The master station checks that B100 is turned on, and turns off B0.
The local station checks that B0 is turned off, and turns off B100.