Mitsubishi MELSEC-F Series FX3U PLC CPU Programmable Logic Controllers

Product Overview

The Mitsubishi Electric MELSEC-F Series FX3U PLC CPU is a third-generation, high-performance micro-programmable logic controller (PLC) that represents the flagship model of the renowned FX3 series . Designed as a compact, all-in-one CPU unit with built-in I/O, the FX3U delivers exceptional speed, capacity, and functionality for a wide range of industrial automation applications . With basic instruction processing speeds of just 65ns and a generous 64K step program memory, this controller handles complex control tasks with remarkable efficiency . Available in multiple configurations with built-in I/O points ranging from 16 to 128 points and expandable up to 384 total I/O points via remote networks, the FX3U series provides the flexibility and performance required for small to medium-scale automation systems, from standalone machinery to networked production lines .

Technical Specifications

Model Number Selection Guide

The FX3U series uses a systematic model code to identify specific configurations .

Model Code Decoder:

• MR: Relay Output

• MT: Transistor Output (Sink/NPN)

• MSS: Transistor Output (Source/PNP)

• ES: AC Power Supply (100-240V AC)

• DS: DC Power Supply (24V DC)

• -A: Denotes specific regional variants (e.g., for Asian market)

Expansion Modules & Options

Typical Applications

The Mitsubishi FX3U series is ideally suited for a wide range of industrial automation applications requiring reliable, high-speed control in a compact form factor :

• Packaging Machinery: Form-fill-seal machines, cartoners, and labeling systems requiring precise positioning and high-speed sequencing

• Material Handling: Small to medium conveyor systems, sortation units, and pick-and-place stations

• Automated Assembly: Component assembly stations, test equipment, and parts feeders in automotive and electronics manufacturing

• Food & Beverage: Mixing equipment, filling lines, and packaging systems with hygienic requirements

• Textile Machinery: Spinning frames, weaving looms, and finishing equipment requiring synchronized speed control

• Machine Tools: Auxiliary equipment control, tool changers, and part loaders for CNC machines

• Process Control: Batch control, temperature monitoring, and chemical dosing for small-scale processes

• Water Treatment: Pump control, filtration systems, and chemical feed applications

• Building Automation: HVAC control, lighting systems, and access control for small facilities

• Specialty Machinery: Woodworking, printing presses, and plastic molding machines

Why Choose the Mitsubishi MELSEC-F Series FX3U?

The Mitsubishi FX3U Series PLC CPU represents the culmination of decades of PLC development, delivering the perfect balance of high-speed performance, extensive functionality, and proven reliability in a compact, cost-effective package . As the flagship model of the FX3 series, it offers significant advancements over previous generations, with processing speeds nearly three times faster than the FX2N series and substantially expanded memory capacity .

The FX3U’s built-in 3-axis positioning at 100kHz eliminates the need for separate motion modules in many applications, reducing system cost and panel space . Its ability to connect up to 6 special adapters without consuming I/O points provides exceptional flexibility for communication, analog, and temperature control requirements . With support for up to 384 total I/O points via CC-Link networks, the system scales gracefully from simple standalone machines to more complex distributed applications .

Backed by Mitsubishi Electric’s global reputation for quality and reliability, the FX3U carries comprehensive certifications including CE, UL/cUL, KC, and approvals from 8 major marine classification societies, ensuring worldwide acceptance . Its compatibility with the extensive FX2N expansion module library protects prior investments while enabling gradual system enhancements .

Whether you are building a simple packaging machine, a specialized assembly station, or a small-scale process control system, the FX3U delivers the performance, flexibility, and long-term reliability required for success in today’s competitive industrial environment. Choose the Mitsubishi MELSEC-F Series FX3U for proven third-generation performance that stands the test of time.