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MELSEC-F series

Features

  1. Data link can be realized by a simple program with connecting up to 8 units of FX PLC.
  2. The bit device (0 to 64 points) and word device (4 to 8 points) have been automatically linked among each station. The ON/OFF state of other stations and data register values can be obtained by the device allocated on the local station.

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 Conforming to RS-485 standard
Total extension length When all communication modules used are special adapter: 500 m
When function expansion board is used or included in system: 50 m
Communication method/Transmission speed Half-duplex bidirectional, 38400 bps
No.of connectable units Max. 8 units
Link points Pattern 0 Bit device: 0 points, Word device: 4 points (FX3S,FX3G,FX3U,FX3GC,FX3UC)
Pattern 1 Bit device: 32 points, Word device: 4 points (FX3S,FX3G,FX3U,FX3GC,FX3UC)
Pattern 2 Bit device: 64 points, Word device: 8 points (FX3S,FX3G,FX3U,FX3GC,FX3UC)
Link refresh time (ms) Pattern 0 Based on the no. of connection units, 2 units(18),3 units(26),4 units(33),5 units(41),6 units(49),7 units(57),8 units(65)
Pattern 1 Based on the no. of connection units, 2 units(22),3 units(32),4 units(42),5 units(52),6 units(62),7 units(72),8 units(82)
Pattern 2 Based on the no. of connection units, 2 units(34),3 units(50),4 units(66),5 units(83),6 units(99),7 units(115),8 units(131)
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*
FX3U-485-BD or Function expansion board+FX3U-485ADP-MB
Applicable FX PLC FX3S,FX3G,FX3U,FX3UC

*: Function expansion board cannot be connected to FX3UC-**MT/D, FX3UC-**MT/DSS and FX3UC-16MR/D(S)-T. Specific adapter can be directly connected.