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.

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:

Python.NET (C#)

import asyncio

from slmp import SlmpConnectionOptions, open_and_connect, read_typed


async def main() -> None:
    options = SlmpConnectionOptions(host="192.168.250.100", port=1025, plc_profile="melsec:mx-f")
    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) { Port = 1025 };
await using var client = await SlmpClientFactory.OpenAndConnectAsync(options);
var value = await client.ReadTypedAsync("D100", "U");
Console.WriteLine($"D100={value}");

Screenshots

Unit parameters screen for the built-in Ethernet port.

Connection settings screen for the first SLMP entry.

Connection settings screen for the second SLMP entry.