Factory Automation

MELSEC-F series Parallel Link

    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
    • *1FX3G 14 pt, 24 pt models: 1 board. 40 pt, 60 pt models: 2 boards.
    • *2Can be connected only to the FX3UC-32MT-LT(-2).
    • *3When connecting to FX3G, FX3G-CNV-ADP is required.
    • *4When connecting to FX3U, FX3UC-32MT-LT(-2), function expansion board is required.
    • *5Function expansion board and FX3S-CNV-ADP cannot be used together.
    • *6When 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: 19200 bps, 115200 bps (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: 70 ms *1 + master station operation cycle (ms) + slave station operation cycle (ms)
    High speed mode: 20 ms *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
    • *1FX3S, FX3G, FX3GC, FX3U, FX3UC : 15 ms
    • *2FX3S, FX3G, FX3GC, FX3U, FX3UC : 5 ms
    • *3Function expansion board cannot be connected to FX3UC-**MT/D and FX3UC-**MT/DSS. Specific adapter can be directly connected.