⚠️ This package has been renamed to plc-comm-slmp. slmp-connect-python 1.2.1 is the final release under the old name and will receive no further updates. Install the new package instead: pip install plc-comm-slmp (import name is unchanged).

MELSEC SLMP for Python

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

Supported PLC profiles

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

Sync and async clients use strict_profile=True by default. With a selected profile, operations known to be unavailable for that PLC are rejected before sending. Set strict_profile=False only for deliberate verification where you want the PLC to answer directly. Point limits and read-only write policies are always enforced.

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 slmp-connect-python

Quick example

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:iq-r")
    async with await open_and_connect(options) as client:
        value = await read_typed(client, "D100", "U")
        print(f"D100={value}")

asyncio.run(main())

Documentation

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