Description
Core Product Summary (Brand / Model / Key Attributes)
The Mitsubishi Electric FX3G-40MT/ESS (also referenced as FX3G-40MTESS) is a compact PLC main unit from the MELSEC-F FX3G series. It provides 40 built-in I/O points consisting of 24 digital inputs (24 V DC, sink/source compatible) and 16 transistor outputs (source type, 5–30 V DC).
The unit is powered by 100–240 V AC, features 32K steps of EEPROM program memory, a basic instruction processing speed of 0.21 μs/step, and built-in USB and RS-422 communication ports. It supports expansion up to 128 local I/O points (256 points when remote I/O is included). The FX3G-40MT/ESS is suitable for small to medium automation applications requiring reliable discrete control and high-speed pulse output capability.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Compact PLC main unit (CPU with built-in I/O) |
| Series | MELSEC-F FX3G |
| Model | FX3G-40MT/ESS |
| Power Supply | 100–240 V AC, 50/60 Hz |
| Total I/O Points | 40 (built-in) |
| Digital Inputs | 24 × 24 V DC (sink/source) |
| Digital Outputs | 16 × transistor (source type), 5–30 V DC |
| Output Current | 0.5 A per point / 0.8 A per common group |
| Program Memory | 32K steps (EEPROM) |
| Processing Speed | 0.21 μs / basic instruction |
| Built-in Communication | USB + RS-422 |
| Expandable I/O | Up to 128 local points (256 with remote I/O) |
| Power Consumption | 37 W |
| Dimensions (W × H × D) | 130 × 90 × 86 mm |
| Weight | Approx. 0.7 kg |
| Operating Temperature | 0 to 55 °C |
| Protection Class | IP10 |
Detailed Product Overview
The Mitsubishi FX3G-40MT/ESS is a third-generation compact programmable logic controller designed for industrial automation tasks that require a balance of performance, expandability, and cost efficiency. As a main unit in the FX3G series, it integrates the CPU, power supply, and 40 discrete I/O points in a single DIN-rail mountable housing.
The 24 digital inputs accept 24 V DC signals and support both sink and source wiring. The 16 transistor outputs are source-type (PNP) and rated for 5–30 V DC, making them suitable for driving DC loads and generating high-speed pulses for positioning or motor control applications. Basic instruction execution speed is 0.21 μs per step, supporting responsive control loops.
Program memory is 32K steps of non-volatile EEPROM. Built-in USB and RS-422 ports allow convenient programming and communication with HMIs or other devices. The unit can be expanded with FX-series expansion modules and special adapters to reach a total of 128 local I/O points, or up to 256 points when remote I/O networks are used.
The FX3G-40MT/ESS is commonly applied in packaging machinery, conveyors, material handling systems, and other small-to-medium automated equipment. Note that the FX3G series has entered the end-of-life phase; users planning long-term projects should confirm current availability and consider the recommended FX5-series successors for new designs.
FX3G-40MT/ESS
FX3G-40MT/ESS
Engineering Selection Highlights
- 40 built-in I/O points (24 DI + 16 DO) → ready-to-use discrete control without immediate expansion.
- Source-type transistor outputs → suitable for DC loads and high-speed pulse applications.
- 0.21 μs basic instruction speed → responsive performance for mid-range machine control.
- 32K-step EEPROM memory → non-volatile program storage with adequate capacity for typical applications.
- Built-in USB and RS-422 → simplified programming and HMI connectivity.
- Expandable to 128 local / 256 total I/O points → supports future system growth.
- 100–240 V AC power supply → wide input voltage range for global installations.
- Compact DIN-rail form factor (130 mm width) → efficient use of control-cabinet space.
Dimensions, Mounting & Connection Notes
- Dimensions: 130 mm (W) × 90 mm (H) × 86 mm (D)
- Weight: approximately 0.7 kg
- Mounting: DIN rail
- I/O connections: Screw-clamp terminals
- Communication ports: USB and RS-422 on the main unit
Exact terminal assignments, wiring diagrams, and expansion rules are defined in the official Mitsubishi FX3G hardware and programming manuals.
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
|---|---|---|
| Power Supply | 100–240 V AC | Standard AC mains |
| Digital Inputs | 24 V DC, sink or source | Compatible with common industrial sensors |
| Digital Outputs | 5–30 V DC, source (PNP) transistor | Suitable for DC solenoids, relays, and pulse loads |
| Programming | GX Works2 / GX Developer | Standard Mitsubishi FX software tools |
| Communication | Built-in USB and RS-422 | Direct PC and HMI connection |
| Expansion | FX-series expansion modules and adapters | Up to 128 local I/O points |
| Mounting | DIN rail | Standard industrial mounting |
| Successor Series | FX5 series (e.g., FX5S / FX5UJ variants) | Recommended for new long-term projects |
FAQ
What is the Mitsubishi FX3G-40MT/ESS?
It is a compact PLC main unit from the MELSEC-F FX3G series with 40 built-in I/O points (24 digital inputs and 16 source-type transistor outputs).
What is the power supply requirement?
100–240 V AC, 50/60 Hz.
What type of outputs does it have?
16 transistor outputs, source type (PNP), rated 5–30 V DC, 0.5 A per point.
How much program memory is available?
32K steps of EEPROM memory.
Can the I/O count be expanded?
Yes. The unit supports expansion up to 128 local I/O points, or 256 points when remote I/O is included.
Is the FX3G series still in production?
The FX3G series has entered the end-of-life phase. Confirm current availability with your supplier and consider FX5-series successors for new long-term applications.
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