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MELSEC MX-F — PLC-side settings

MELSEC MX-F — built-in Ethernet port (CPU module).

What you need

  • Configuration tool: GX Works3
  • Network: Align IP address, subnet mask, and default gateway with your network environment.
  • After configuration: Power cycle the PLC to apply the new parameters.

Example values used in this guide

Parameter Example value Notes
IP address 192.168.250.100 Adapt to your network
TCP port 1025 SLMP TCP
UDP port 1035 SLMP UDP

PLC-side settings

MX-F uses its own canonical library profile (melsec:mx-f) while keeping iQ-F-compatible SLMP connection settings.

Connection reports wanted

This project has not yet received live connection reports for the melsec:mx-f profile. If you use this profile, please report both successful and failed connection examples, including the PLC model, port setting, selected profile, and first SLMP end code when a connection fails.

Screen: Unit parameters

Parameter Setting
IP Address 192.168.250.100 (example)
Subnet Mask Match your network
Default Gateway Match your network
Communication Data Code Binary

Screen: Connection settings

Parameter TCP UDP
Communication Method SLMP SLMP
Protocol TCP UDP
Port Number 1025 1035
Remote Device IP Address - Enter the IP of the connecting PC
Keep-Alive Enabled Disabled

DX/DY not valid for MX-F

Use X and Y instead of DX and DY with the MX-F profile.

Connecting with this library

Parameter Value
Canonical profile melsec:mx-f
Port (TCP) 1025
Port (UDP) 1035

Code example:

import asyncio

from slmp import SlmpConnectionOptions, SlmpTarget, open_and_connect, read_typed


async def main() -> None:
    options = SlmpConnectionOptions(
        host="192.168.250.100",
        port=1025,
        transport="tcp",
        plc_profile="melsec:mx-f",
        default_target=SlmpTarget(network=0, station=0xFF, module_io=0x03FF, multidrop=0),
    )
    async with await open_and_connect(options) as client:
        value = await read_typed(client, "D100", "U")
        print(f"D100={value}")


asyncio.run(main())

using PlcComm.Slmp;

var options = new SlmpConnectionOptions(
    "192.168.250.100", SlmpPlcProfile.MxF, 1025,
    SlmpTransportMode.Tcp, SlmpTargetAddress.OwnStation);
await using var client = await SlmpClientFactory.OpenAndConnectAsync(options);
var value = await client.ReadTypedAsync("D100", "U");
Console.WriteLine($"D100={value}");

The PLC-side settings on this page apply to every language. For Rust, C++ (Arduino/PlatformIO), and Node-RED, start from each library's Getting started.

Screenshots

Unit parameters screen for the built-in Ethernet port Unit parameters screen for the built-in Ethernet port.

Connection settings screen for the first SLMP entry Connection settings screen for the first SLMP entry.

Connection settings screen for the second SLMP entry Connection settings screen for the second SLMP entry.