MELSEC-F series

Features

1. Data link between two FX PLC main units can be made easily just by programming to specify master/slave station.
2. Bit devices (50 to 100 points) and word devices (10 points) are automatically linked between each station. Depending on the devices allocated in the host station, the ON/OFF states and data register values of the other station can be known.

Applicable communication device

RS-485 communication device

Model		Applicable FX PLC
		FX 3S	FX 3G	FX 3U	FX 3GC	FX 3UC
Function expansion board	FX3G-485-BD	*5 ○ Max. 1 unit	○ Max. 2 units *1	×	×	×
	FX3G-485-BD-RJ	*5 ○ Max. 1 unit	○ Max. 2 units *1	×	×	×
	FX3U-485-BD	×	×	○ Max. 1 unit	×	*2 ○ Max. 1 unit
Specific adapter	FX3U-485ADP-MB	*6 ○ Max. 1 unit	*3 ○ Max. 2 units *1	*4 ○ Max. 2 units	○ Max. 2 units	*4 ○ Max. 2 units

*1: FX3G 14pt, 24pt models: 1 board. 40pt, 60pt models: 2 boards.
*2: Can be connected only to the FX3UC-32MT-LT(-2).
*3: When connecting to FX3G, FX3G-CNV-ADP is required.
*4: When connecting to FX3U，FX3UC-32MT-LT(-2), function expansion board is required.
*5: Function expansion board and FX3S-CNV-ADP cannot be used together.
*6: When connecting to FX3S, FX3S-CNV-ADP is required.

System configuration example

Specifications

Items						Specifications
Transmission standard						Conforms to RS-485 and RS-422 standards
Max. transmission distance						When special adapter is used: 500 m When function expansion board is used (including when special adapter and function expansion board are used together): 50 m
Communication method/Transmission speed						Half-duplex bidirectional: 19200bps，115200bps (FX3S，FX3G，FX3U，FX3GC，FX3UC)
Number of connectable units (configuration)						1 : 1
Link points		FX3S				[Master -> Slave]: Bit device 50 points, word device 10 points (when high speed mode, word device 2 points) [Slave -> Master]: Bit device 50 points, word device 10 points (when high speed mode, word device 2 points)
		FX3G，FX3U， FX3GC，FX3UC				[Master -> Slave]: Bit device 100 points, word device 10 points (when high speed mode, word device 2 points) [Slave -> Master]: Bit device 100 points, word device 10 points (when high speed mode, word device 2 points)
Link time						Regular mode: 70ms*1 + master station operation cycle(ms) + slave station operation cycle(ms) High speed mode: 20ms*2 + master station operation cycle(ms) + slave station operation cycle(ms)
Combination with connectable PLC models						[FX3S and FX3S] [FX3G, FX3GC and FX3G, FX3GC] [FX3U, FX3UC and FX3U, FX3UC]
Connection device with PLC			FX3S			FX3G-485-BD(-RJ), or FX3S-CNV-ADP + FX3U-485ADP-MB
			FX3G			FX3G-485-BD(-RJ)), or FX3G-CNV-ADP + FX3U-485ADP-MB
			FX3GC			FX3U-485ADP-MB
			FX3U，FX3UC*3			FX3U-485-BD, or function expansion board + FX3U-485ADP-MB

*1: FX3S, FX3G, FX3GC, FX3U, FX3UC : 15ms
*2: FX3S, FX3G, FX3GC, FX3U, FX3UC : 5ms
*3: Function expansion board cannot be connected to FX3UC-**MT/D and FX3UC-**MT/DSS. Specific adapter can be directly connected.