MELSEC SLMP for Python

Python library for MELSEC SLMP (Binary 3E/4E) PLC communication.

PLC Comm Family

This library is part of the plc-comm family. See the package matrix for protocol, language, registry, and install-command mapping.

Supported PLC profiles

The maintained profile table is in PLC profiles. Choose one exact canonical PLC profile from that table.

Sync and async public clients always enforce the selected PLC profile. Point limits and read-only write policies are also enforced before transport.

Supported device types

The maintained device and range tables are in the SLMP Profile Reference. Use that page for supported device families, address syntax, and profile-specific notes.

Installation

pip install plc-comm-slmp

Quick 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:iq-r",
        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())

Documentation

For a zero-code connectivity check, see PLC Scope (Windows).

License and registry

Commercial support

If you plan to embed this library in a paid or commercial product, please consider a separate support agreement or supporting the project as a sponsor.

Contact: https://fa-labo.com/contact.html