Basic Functions; Communication Between Master Station And Remote I/O Stations - Mitsubishi FX3U User Manual

FX -16CCL-M User's Manual
3U
6.2

Basic Functions

6.2.1

Communication between master station and remote I/O stations

This subsection describes the overview of the communication between the master station and remote I/O
stations.
In the communication with the remote I/O station, the on/off data of the switches and indicator lamps are
communicated through remote input RX and remote output RY.
PLC
SET
BFM#10 b0
SET
BFM#10 b6
Data link startup
1) The PLC sets to ON the write refresh command (BFM#10 b0), and makes the data of the remote output
(RY) effective.
When the write refresh command (BFM#10 b0) is OFF, all data of the remote output (RY) is treated as "0
(OFF)".
2) The PLC sets to ON the write data link startup by buffer memory parameters (BFM#10 b6) to start the
data link.
When the data link starts normally, the read data link status in master station (BFM#10 b1) turns ON.
42
Master station
1)
M Refresh command
2)
M Data link startup
Buffer memory
4)
FROM Remote input (RX)
5)
TO Remote output (RY)
Remote I/O station
3)
Link scan Input
6)
Link scan Output
6 Introduction of Functions
6.2 Basic Functions