GT3U‑48 PLC Industrial Control Board – FX3U‑Compatible with Ethernet

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Elevate your automation setup with a powerful, cost‑effective GT3U‑48 PLC control board—offering Ethernet connectivity, 48 I/O points (24 inputs, 24 outputs), fast counting, analog I/O, and robust Mitsubishi FX3U compatibility.


A compact, Ethernet‑enabled 48 I/O FX3U‑compatible PLC board, ideal for industrial applications requiring automation, high‑speed I/O, and networked control.

Product Overview
The GT3U‑48 (also referenced as FX3U‑48MT‑ESS) integrates a 48‑point I/O system (24 DC inputs, 24 transistor outputs), six analog inputs, two analog outputs, and a high‑speed counting module. It includes built‑in Ethernet and RS‑485 ports for easy network integration. Optimized for industrial environments—warehousing, packaging, food processing, and more—it supports GX Works 2 or GX Developer programming, offers a 1 A output per point on 24 V DC, and maintains stable performance under constant load.

How to Use

  1. Mount securely using the integrated mounting holes.
  2. Wire 24 V DC power, inputs (e.g., sensors), and outputs (e.g., solenoids) accordingly.
  3. Connect to PC via Ethernet or RS‑485 for online programming and monitoring.
  4. Use GX Works 2 to configure Ethernet settings (IP, MC protocol port) and download ladder logic.
  5. Take advantage of analog inputs/outputs for smooth sensor data or actuator control.
  6. Use high‑speed counting/pulse outputs for encoders or stepper motor control.
    Usage Tips
    • Ensure proper grounding and shielding to reduce interference.
    • Add FX3U‑ENET‑L module if you need advanced Ethernet features.
    • For mobile or remote access, route through Ethernet‑to‑Wi‑Fi gateway or router.

Frequently Asked Questions (FAQ)

  1. Does it have built‑in Ethernet?
    Yes, Ethernet port is integrated on the FX3U‑48MT‑ESS model.
  2. Can I program it with GX Works 2?
    Absolutely—supports Ethernet and RS‑485 online programming.
  3. How many analog I/O channels?
    Six analog inputs, two analog outputs.
  4. Max output current per point?
    Output current is up to 1 A per transistor output.
  5. Is it compatible with FX3U‑ENET‑L module?
    Yes—if you need additional Ethernet features like MC protocol or peer‑to‑peer, pairing with FX3U‑ENET module is supported.
  6. Supports high‑speed counting?
    Yes—4 pulse‑out channels and 6 channels up to 12 kHz high‑speed counting.
  7. Can I monitor it remotely?
    Yes, via Ethernet—GX Works 2 and SCADA systems can access real-time I/O; Wi‑Fi possible via network adapter.
  8. What software is needed?
    GX Developer or GX Works 2; SCADA optional.
  9. Operating environment?
    Designed for industrial 24 V DC control.
  10. Mounting footprint?
    Approximately 6.85″ × 3.94″ × 1.18″ (174 × 100 × 30 mm).

User Review Summary
User feedback from Amazon indicates strong value and functionality:

  • Pros: Reliable FX3U compatibility, easy integration, stable performance under load.
  • Cons: Limited reviews—common note is lack of official brand support and manual clarity.

Comparison with Competing Products
Mitsubishi FX3U‑48MT‑ESS: Genuine Mitsubishi board with 48 I/O, built‑in Ethernet, 6 A/I & 2 A/O, ~US $340.
Mitsubishi FX3U‑ENET‑L module: Ethernet adapter block to add to FX3U units, ~US $374.
Mitsubishi FX3U‑128MR/ES‑A: Larger 128 I/O relay output unit without integrated Ethernet, ~US $630.
– The GT3U‑48 offers mid-range I/O with Ethernet built‑in at lower cost vs full FX3U.
– If you need more I/O or relay outputs, FX3U‑128MR is better but lacks Ethernet; you’d need ENET‑L.
– The ENET‑L module offers flexibility to add networking separately.

Technical Specifications
Size: 6.85 × 3.94 × 1.18 in; Weight: ~1 lb
Power: 24 V DC; Outputs: 24 transistor, 1 A each
Inputs: 24 DC; Analog: 6 inputs, 2 outputs
Pulse: 4 channels @ 100 kHz, 6 channels @ 12 kHz high‑speed counts
Communication: Ethernet (10/100 Mbps), RS‑485; optional RS‑232
Memory: 8 k steps; Programming: GX Developer, GX Works 2
Mounting: DIN‑rail compatible or panel mount

Brand or Manufacturer Info
The FX3U‑48MT‑ESS and ENET‑L module are from Mitsubishi Electric, a globally recognized company in industrial automation known for reliability and innovation. The GT3U‑48 is a third‑party alternative designed for FX3U compatibility, offering cost savings while maintaining core functionality.

Purchase Recommendations
Lollette：https://www.lollette.com/gt3u-48-plc-industrial-control-board-fx3u-compatible

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