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11 COMMUNICATION BETWEEN THE MASTER STATION AND THE
LOCAL STATION
MELSEC-QnA
REMARK
By building an interlock using the remote I/O (RX/RY), data read from/written to
each slave station will not be separated between the new and old one.
Configure an interlock with remote I/O (RX/RY) as shown in the following example.
Sending station (master station) Receiving station (local station)
1) 2)
7)
3)
1) 4)
6)
5)
1) The send/receive command (M700) turns ON.
2) Data of D200 to D203 are stored in RWw0 to RWw3.
3) Upon completion of storage in RWw0 to RWw3, M200 (RY00) for handshake
turns ON.
1
4) By cyclic transmission, remote output (RY) data are sent following the remote
register (RWw) data, and the receiving station’s M200 (RX00) turns ON.
5) Data of RWr0 to RWr3 are stored in D200 to D203.
6) Upon completion of storage in D200 to D203, M0 (RY00) for handshake turns
ON.
1
7) When the data transmission to the receiving station is complete, M200(RY00)
turns OFF.
1 When a handshake is performed for one bit of the remote I/O (RX/RY) in a
station with the number of occupied stations of two or more, the integrity of
cyclic data is assured per slave station.
An interlock for the number of occupied stations (in units of four words) is not
required.