MITSUBISHI FX3G-40MR/ES MELSEC-F FX3G PLC Main Unit

OverviewMITSUBISHI FX3G-40MR/ES is a 40-point integrated main controller of Mitsubishi MELSEC-F FX3G series, AC power supply type with relay outputs. MITSUBISHI FX3G-40MR/ES comes with 24 sink/source selectable 24VDC digital inputs and 16 relay outputs. It supports up to 32000 steps program memory, and can be equipped with two expansion boards for communication, analog or special functions. The local I/O can be extended to 128 points, and the total I/O reaches 256 points when combined with CC-Link remote I/O. It has built-in USB and RS422 ports for programming and peripheral connection, and supports Modbus RTU, CC-Link and other communication protocols. This unit is widely used in packaging, conveying, injection molding, water treatment and small skid automation. MITSUBISHI FX3G-40MR/ES has been discontinued, and it is a popular spare part for maintenance and replacement of existing FX3G automation systems.

FeaturesMITSUBISHI FX3G-40MR/ES adopts compact DIN rail mounting design, with fast basic instruction execution speed. The FX3G PLC Main Unit relay output supports both AC and DC loads, with strong load adaptability. It provides high-speed input for pulse capture and high-speed counter functions, and supports pulse width and cycle measurement with high precision. Two expansion board slots allow flexible addition of analog, serial communication and special adapter modules. It has built-in real-time clock and battery backup for data retention after power failure. The unit carries CE, UL/cUL, KC and marine certification options, and shows stable EMC performance in ordinary factory environments. MITSUBISHI FX3G-40MR/ES can be programmed by GX Works2 software, compatible with FX family instruction system.

SpecsMITSUBISHI FX3G-40MR/ES 40-point PLC main unit. The FX3G PLC Main Unit power supply: 100–240V AC, 50/60Hz. Digital input: 24 × 24VDC, sink/source switchable. Output: 16 × relay NO. Program memory: 32000 steps. Max local I/O: 128 points. Max total I/O with remote CC-Link: 256 points. Communication: USB, RS422, expandable RS485. Expansion board: 2 slots. Mounting: DIN rail mounting. Lifecycle: discontinued. It is stocked as compact sequence control spare.

Operating ParametersMITSUBISHI FX3G-40MR/ES ambient operating temperature: 0℃ ~ +55℃. The FX3G PLC Main Unit relative humidity: 5%~95% non-condensing. Relay contact rating: 2A per point resistive load. Input signal: 24VDC. EMC: comply with IEC industrial standards. Storage temperature: -20℃ ~ +75℃.

PrincipleMITSUBISHI FX3G-40MR/ES cyclically scans the input terminals to collect the status of sensors and switches. The FX3G PLC Main Unit executes the stored ladder logic program, then drives the internal relay circuits to switch the output contacts. It can process high-speed pulse signals for counting and timing tasks, and exchange data with HMI, inverters and other devices via serial bus. The internal self-diagnosis circuit monitors power supply, memory and I/O status. If overload or coil burnout occurs on relay channels, MITSUBISHI FX3G-40MR/ES will lose output control and need replacement.

ApplicationsMITSUBISHI FX3G-40MR/ES is widely deployed in packaging machines, conveyor lines, injection molding auxiliary equipment, small water treatment skids, furnace auxiliary control and general standalone automation. The FX3G PLC Main Unit undertakes sequence logic, interlock protection and simple motion control. It cooperates with sensors, contactors, HMIs and expansion modules to build independent small control systems. MITSUBISHI FX3G-40MR/ES is a preferred spare for legacy FX3G system retrofit and replacement.