Factory Automation

MELSEC-F series N:N Network

Features

  1. 1. Data link can be realized by a simple program with connecting up to 8 units of FX PLC.
  2. 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

Order acceptance:
March, 2028
Production discontinuation:
September, 2028

× × ○
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 14 pt, 24 pt models: 1 board. 40 pt, 60 pt 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.