Intro Summary
Modular GT3U‑20 PLC for industrial control with Ethernet, analog I/O, CAN bus, and high‑speed relay outputs—ideal for cost‑effective FX3U replacements.
Product Overview
The GT3U‑20 is a compact yet powerful PLC compatible with Mitsubishi FX3U, featuring 12 digital inputs and 8 relay outputs. It boasts built‑in Ethernet, RS‑232, RS‑485, and CAN bus interfaces, plus optional analog I/O and fast I/O channels. Rated for 24 V DC operation, it supports high‑speed and network‑ed automation setups, making it a versatile, economical alternative to OEM FX3U modules .
How to Use
- Mount on DIN rail and wire 24 V DC power.
- Connect sensors/actuators to digital inputs (12) and relay outputs (8).
- Attach Ethernet cable directly to the built‑in port for PC communication.
- Use Mitsubishi GX Developer or GX Works 2 to upload ladder logic and network settings.
- Configure Ethernet address and ports in PLC parameters or via FX Configurator‑EN.
- Program I/O logic and test operation in-run mode.
Tips: For remote network use, enable UDP in Ethernet settings. RJ‑45 network disconnect unnecessarily disrupts PLC logic but avoid during live runs.
FAQ
- Is GT3U‑20 truly FX3U‑compatible?
Yes—supports Mitsubishi’s GX Developer, GX Works programming tools . - Does it include Ethernet?
Yes—a built‑in 10/100 Mbps Ethernet port enables PC and SCADA network connections. - What communication ports exist?
Ethernet, RS‑232, RS‑485, optional CAN, plus analog I/O channels. - How many I/Os are supported?
GT3U‑20 specifically offers 12 digital inputs and 8 relay outputs; larger versions (32/48/80 I/O) are available . - Can it do analog control?
Yes, optional 4 AD and 2 DA analog modules can be added. - What programming software is needed?
Use Mitsubishi GX Developer or GX Works 2; Ethernet parameters may require FX Configurator‑EN tool. - Is Modbus or SCADA supported?
Yes—works with GX-configured MC protocol, UDP-based SCADA via Ethernet; GT3U‑20 can be integrated using software like Kepware . - What’s the operating voltage?
24 V DC input, common in industrial environments. - Does it need DIN rail mounting?
Yes—standard DIN‑rail mount for industrial control cabinets. - Is it safe for production environments?
Yes, with proper wiring and grounding, it supports robust and real-time industrial applications.
User Review Summary
Community reports emphasize excellent FX3U compatibility—analog and network features exceed expectations. Many comment it delivers high performance at under $200. A few note that configuring advanced Ethernet/Modbus functions can be challenging without GX Configurator‑EN experience, but once set up, reliability is solid.
Comparison with Competing Products
• LK3U-32/80 (Lingkong) – Similar I/O count but fewer Ethernet options; lacks CAN bus and analog support .
• Generic FX3U + ENET-ADP Combo – Mitsubishi’s official modules offer brand reliability and full support, but cost >$400 vs. GT3U‑20’s ~$200–300.
• XUEPLC GT3U‑14 – Smaller I/O (8/6) but same FX3U-compatibility and Ethernet; better for simpler applications .
Technical Specifications
- Digital Inputs: 12 (expandable)
- Relay Outputs: 8
- Ethernet: 10/100 Mbps RJ‑45
- Serial: RS‑232, RS‑485
- CAN bus: 1 optional
- Analog I/O: 4 AD, 2 DA (optional)
- Power: 24 V DC, typical industrial range
- Mounting: DIN‑rail
- Enclosure: Industrial black housing
- Programming: GX Developer / GX Works 2, FX Configurator‑EN
- Environmental: industrial temperature range (likely –20° to 55 °C)
Brand or Manufacturer Info
LOLLETTE produces cost-effective PLCs compatible with Mitsubishi FX3U series. Known for offering advanced I/O features—Ethernet, CAN, analog—at significantly lower price points, their products are widely adopted in automation projects where budget and functionality align.
Purchase Recommendations
Lollette: https://www.lollette.com/gt3u-20-plc-industrial-control-board-fx3u-compatible