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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

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.