MC Protocol Ethernet driver for Mitsubishi FX3 PLCs
Project description
fx3u-mcprotocol
An independent, open-source Python library for communicating with Mitsubishi FX3-series PLCs via Ethernet using the MC Protocol (ASCII and Binary) over TCP.
Supported Hardware
- FX3U / FX3G / FX3S / FX3GC
- FX3U-ENET-ADP Ethernet adapter
Disclaimer
-
This project is an independent, open-source implementation of the MC Protocol for interoperability and educational purposes.
-
Mitsubishi Electric, FX3U, FX3G, FX3S, and related names are trademarks of Mitsubishi Electric Corporation.
-
This project is not affiliated with, endorsed by, or supported by Mitsubishi Electric Corporation.
Features
- Symbol-based memory access (D, M, X, Y, R)
- ASCII MC Protocol (stable)
- Binary MC Protocol (experimental)
- CPU-aware memory validation
- Cross-platform (Windows / Linux)
✅ Stable ASCII MC Protocol support (FX3 series)
⚠️ Binary MC Protocol support is experimental and may vary by firmware
Example
from fx3u_mcprotocol import FX3UClient
plc = FX3UClient(
ip="192.168.4.4",
port=5001,
cpu="FX3U",
mode="ascii"
)
plc.connect()
print(plc.readReg("D100"))
print(plc.readBits("M0", 8))
plc.close()
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