Sigma Industrial Automation Sigma Industrial Automation
Sigma Industrial Automation Sigma Industrial Automation
Sigma Industrial Automation Sigma Industrial Automation Sigma Industrial Automation Sigma Industrial Automation Sigma Industrial Automation Sigma Industrial Automation
Sigma Industrial Automation Sigma Industrial Automation Sigma Industrial Automation Sigma Industrial Automation
Sigma Industrial Automation
Sigma Industrial Automation
Sigma Industrial Automation
Home » Our Products » Mitsubishi PLC » Compact PLC » MELSEC FX3U

MELSEC FX3U

The new FX3U series is the third generation of Mitsubishi Electric's successful compact PLC family. Developed for the international market, the new controllers feature a special second "adapter bus" system, which complements the existing system bus used for expansion, special function and network modules. Up to ten additional modules can be connected to this new adapter bus.

The FX3U controllers also impress with their speed (0.065µs per logical instruction), a significantly larger instruction set with a total of 209 instructions and improved functions and modules, particularly for positioning tasks. Other improvements include enhanced communications capabilities with Ethernet, USB and RS-422 mini DIN connectors.

The enhanced networking support has also increased the I/O capacity of the new flagship model, which can now be expanded to a maximum of 384 I/Os, including networked connections.
Other Model No.
MELSEC FX3UC MELSEC FX3U MELSEC FX3G MELSEC FX1N MELSEC FX1S
Sigma Industrial Automation

Advantages of the FX3U at a glance :
  • Safe investment
    Fully compatible with the existing MELSEC FX series; IEC 61131-3 standard programming; plenty of reserves for later updates
  • Tailored configurations
    Choose from a comprehensive range of products for positioning, analog signal processing and communications
  • Powerful positioning control
    Internal high-speed counters and pulse outputs (100kHz) in all base units, new counter and pulse output adapters (200 kHz), bus-capable servo system for controlling up to 16 axes with data transfer speeds of up to 50Mbps
  • Fast installation and configuration
    209 ready-to-use instructions
  • Integrated automation
    Modules, functions and instructions are all precisely geared to Mitsubishi automation technology
  • Outstanding value for money
    The performance of a medium-scale PLC system for the price of a micro PLC
Product range

Type FX3U-16M_ FX3U-32M_ FX3U-48M_ FX3U-64M_ FX3U-80M_ FX3U-128M_
Integrated inputs/outputs 16 32 48 64 80 128
Power supply 24 V DC / 100-240 V AC 100-240 V AC
Integrated inputs 8 16 24 32 40 64
Integrated outputs 8 16 24 32 40 64
Output type Relay / Transistor (source type)
Power consumption 25 W / 30 VA 30 W / 35 VA 35 W / 40 VA 40 W / 45 VA 45 W / 50 VA 65 VA
Weight 0.6 0.65 0.85 1.0 1.2 1.8
Dimensions in mm (WxHxD) 130x90x86 150x90x86 182x90x86 220x90x86 285x90x86 350x90x86


Sigma Industrial AutomationSigma Industrial Automation
Sigma Industrial AutomationSigma Industrial Automation