FX3 PLC: Compact, Cost-Effective for Global Small-Scale Automation
FX3 PLC is a compact, cost-effective control solution tailored for global small-scale automation scenarios. Boasting a plug-and-play design that simplifies installation for overseas local technicians, it holds CE and UL certifications to meet the compliance requirements of markets worldwide. Ideal for workshops, small production lines, vending machines, and HVAC systems, this PLC delivers reliable performance with low maintenance costs. Its space-saving structure fits dense equipment layouts, while the easy-to-use programming interface eliminates the need for specialized training—making it the go-to choice for small and medium-sized overseas factories looking to upgrade automation without heavy investment.
Core Features & Highlights
Ultra-Compact Design, Space-Saving & Easy to Install
- Compact body size (e.g., FX3S series is only 60x90x49mm), perfect for small overseas equipment, dense workstations, or space-constrained scenarios
- Integrated CPU, power supply and I/O in one unit, no extra assembly required. Local overseas technicians can finish installation and wiring quickly
High Cost-Effectiveness, Ideal for Small-to-Medium-Scale Needs
- Full product range covering FX3U (high-performance), FX3G (standard) and FX3S (entry-level) series, with I/O points from 10 to 384 selectable on demand
- Budget-friendly entry models allow automation upgrades without heavy investment, especially suitable for overseas startup factories and small-batch production lines
High-Speed Processing & Stable Performance
- Basic instruction processing speed up to 0.065μs, enabling fast response to sensor signals and ensuring efficient operation of small production lines
- Industrial-grade anti-interference design paired with battery-free program storage, ensuring long-term stable operation even in humid, dusty overseas workshops
Flexible Expansion, Adapts to Diverse Scenarios
- Supports various expansion modules/adapters for analog input/output, communication and positioning functions; Ethernet and MODBUS capabilities can be added as needed
- Some models come with built-in high-speed pulse output and counters, capable of directly controlling servo/stepper motors to meet simple positioning control requirements
Globally Compatible, Hassle-Free Cross-Border Use
- Wide voltage input (AC100-240V) adapts to power grids worldwide, no additional transformer needed for use in different countries
- Equipped with international certifications including CE, UL and cUL, complying with market access standards of major overseas regions such as Europe, America and Southeast Asia
High Usability, Lowers Local Maintenance Costs
- Supports multiple programming methods like Ladder Diagram (LD) and Structured Text (ST); GX Works software features simple operation, allowing local technicians to get started without professional training
- Enables online program modification in RUN mode, completing debugging without stopping production and reducing losses from production downtime
Core Technical Parameters
| Parameter Category |
Parameter Item |
FX3S (Entry-Level) |
FX3G (Standard) |
FX3U (High-Performance) |
| Core Performance |
Basic Instruction Processing Speed |
0.21μs/instruction |
0.21μs (Standard Mode)
0.42μs (Extended Mode) |
0.065μs/instruction |
| Program Capacity |
4K steps (Built-in EEPROM)
Optional expansion memory cassette |
32K steps (Built-in EEPROM) |
64K steps (Built-in RAM)
Optional Flash memory cassette |
| I/O Capability |
Built-in I/O Points |
6~30 points |
14~256 points (Including CC-LINK network I/O) |
8~384 points (Including network I/O) |
| Max Extended I/O |
128 points |
256 points |
384 points |
| Position Control |
High-Speed Pulse Output |
Max 100kHz × 2 points |
Max 100kHz × 3 points |
100kHz × 3 points (No interpolation) |
| High-Speed Counter |
1-phase: 60kHz × 4 points, 10kHz × 2 points
2-phase: 30kHz × 2 points, 5kHz × 1 point |
1-phase: 60kHz × 4 points, 10kHz × 2 points
2-phase: 30kHz × 2 points, 5kHz × 1 point |
1-phase: 100kHz × 6, 10kHz × 2
2-phase: 50kHz × 2 |
| Soft Component Resources |
Auxiliary Relay |
7680 points |
7680 points |
7680 points |
| Data Register |
D: 8000 points
R: 24000 points |
D: 8000 points
R: 24000 points |
D: 8000 points
R: 32768 points |
| Timer |
320 points |
320 points |
512 points |
| Communication Interface |
Standard Interface |
RS422 + USB |
RS422 + USB (Dual high-speed interfaces) |
RS422 (Max 115.2Kbps)
Ethernet/MODBUS expandable |
| Power & Environment |
Power Supply Voltage |
AC100-240V/DC24V |
AC100-240V/DC24V |
AC100-240V/DC24V |
| Operating Temperature |
0~55℃ |
0~55℃ |
0~55℃ |
| Physical Specifications |
Dimensions (W×H×D) |
60~100×90×75mm |
90~175×90×86mm |
130~350×90×86mm |
Product Model List
The FX3 series is categorized into four main types for overseas markets: FX3S (Entry-Level), FX3G/FX3GC (Standard), and FX3U/FX3UC (High-Performance). Sub-models are differentiated by I/O point counts, output types, and power supply modes to meet diverse industrial needs worldwide.
FX3S Series (Entry-Level)
As the entry-level micro PLC, mainstream overseas models focus on small I/O configurations. Core models include:
- FX3S-10MR/ES, FX3S-10MT/ES, FX3S-10MT/ESS
- FX3S-14MR/ES, FX3S-14MT/ES, FX3S-14MT/ESS
- FX3S-20MR/ES, FX3S-20MT/ES, FX3S-20MT/ESS
- FX3S-30MR/ES, FX3S-30MT/ES, FX3S-30MT/ESS
- Models with analog expansion: FX3S-30MR/ES-2AD, FX3S-30MT/ES-2AD, FX3S-30MT/ESS-2AD
FX3G/FX3GC Series (Standard)
FX3G serves as the mainstay standard model, while FX3GC is its compact variant. Overseas models are classified by I/O points:
FX3G Core Models
- 14-point: FX3G-14MR/ES-A, FX3G-14MT/ES-A, FX3G-14MR/DS, FX3G-14MT/DS
- 24-point: FX3G-24MR/ES-A, FX3G-24MT/ES-A, FX3G-24MR/DS, FX3G-24MT/DS
- 40-point: FX3G-40MR/ES-A, FX3G-40MT/ES-A, FX3G-40MR/DS, FX3G-40MT/DS
- 60-point: FX3G-60MR/ES-A, FX3G-60MT/ES-A, FX3G-60MR/DS, FX3G-60MT/DS
FX3GC Compact Models
- FX3GC-14MT/D, FX3GC-24MT/D, FX3GC-32MT/D
FX3U/FX3UC Series (High-Performance)
FX3U is the flagship model of the series, and FX3UC is its compact connector-type variant. The series offers a rich lineup of overseas models covering various I/O counts and output types:
FX3U Core Models (By I/O Points + Output Types)
- 16-point: FX3U-16MR/ES, FX3U-16MT/ES, FX3U-16MT/ESS, FX3U-16MR/DS, FX3U-16MT/DS, FX3U-16MT/DSS
- 32-point: FX3U-32MR/ES, FX3U-32MT/ES, FX3U-32MT/ESS, FX3U-32MS/ES, FX3U-32MR/DS, FX3U-32MT/DS
- 48-point: FX3U-48MR/ES, FX3U-48MT/ES, FX3U-48MT/ESS, FX3U-48MR/DS, FX3U-48MT/DS
- 64-point: FX3U-64MR/ES, FX3U-64MT/ES, FX3U-64MT/ESS, FX3U-64MS/ES, FX3U-64MR/DS, FX3U-64MT/DS
- 80-point: FX3U-80MR/ES, FX3U-80MT/ES, FX3U-80MT/ESS, FX3U-80MR/DS, FX3U-80MT/DS
- 128-point: FX3U-128MR/ES, FX3U-128MT/ES, FX3U-128MT/ESS
FX3UC Connector-Type Models
- FX3UC-16MR/D(S)-T, FX3UC-32MT/D, FX3UC-32MT/DSS, FX3UC-64MT/D, FX3UC-96MT/D
Industry Applications
Small-Scale Food Processing
Perfect for small workshops in Thailand, Vietnam, and Indonesia that make snacks, sauces, or bottled drinks. The FX3S series' compact size fits into cramped electrical cabinets, and its 10-30 I/O points are enough to control conveyor belts, filling valves, and temperature sensors. Local technicians can learn to program it in a day—no need for expensive experts. It works with 220V power grids common in the region, and the anti-humidity design holds up in tropical rainy seasons.
Vending Machine & Kiosk Manufacturing
A top pick for vending machine makers in Europe and North America. FX3G models handle the core controls of snack, beverage, or ticket vending machines—managing payment systems, product dispensing, and inventory counting. The plug-and-play design cuts down assembly time for OEMs, and its low power consumption helps vending machines meet EU energy efficiency standards. It also supports MODBUS communication, so it can connect to remote monitoring systems for real-time sales data tracking.
HVAC & Building Automation
Used in small office buildings, retail stores, and hotels across Europe. The FX3U series controls air conditioners, ventilation fans, and lighting systems—adjusting temperature and brightness based on occupancy sensors. Its CE certification means it can be directly installed without extra compliance checks, and the Ethernet expansion module lets facility managers control everything via a smartphone app. For small projects, it's way cheaper than big-brand building automation controllers.
Textile Machinery
A staple in India and Bangladesh's spinning and weaving factories. FX3G models control small looms, yarn tensioners, and fabric cutting machines—synchronizing speed to reduce yarn breakage. The dust-resistant design works in cotton-fluff-filled workshops, and the local language programming interface lets factory workers operate it without knowing English. It also supports high-speed pulse output, so it can adjust loom speed in real time based on fabric thickness.
DIY Workshop & Small Manufacturing
Popular with garage inventors and small factories in the US and Canada that make custom parts, 3D printer enclosures, or small assembly lines. The FX3U series' high I/O count (up to 384 points) handles complex tasks like robotic arm control and quality inspection sensors. It's compatible with 110V North American power, and the GX Works software's English version is easy to use for hobbyists. Many makers use it to automate small batch production without spending a fortune on industrial PLCs.
Agricultural Equipment
Ideal for small to medium-sized farms in Brazil, Argentina, and Mexico. FX3S/FX3G models control irrigation systems, greenhouse temperature regulators, and grain drying machines. The wide voltage input (100-240V) works with unstable rural power grids, and the rugged design resists dust and vibration from farm machinery. Farmers can set up automatic irrigation schedules to save water, and the PLC's battery-free program storage means no data loss during power outages.
Packaging Machinery
Used by local packaging workshops in Dubai, Saudi Arabia, and Qatar that make plastic bags, labels, or gift boxes. The FX3U series controls sealing machines, label printers, and bagging equipment—adjusting speed for different package sizes. It can withstand the high temperatures and dry dust of Middle Eastern workshops, and the RS422 interface connects to barcode scanners for product tracking. For small businesses, it's a cost-effective alternative to expensive imported packaging controllers.
Frequently Asked Questions
Q1: North American factories use 110V voltage—can the FX3 series be connected directly? Will it burn the module?
A: Most models work perfectly! The FX3G/FX3U series support a wide AC voltage range of 100-240V, so they can be plugged directly into 110V (North America), 220V (Europe), or 230V (Southeast Asia) power supplies—no extra transformer needed. Only some FX3S models require DC24V input; just use a local switching power supply to convert the voltage. The key is to check the nameplate before wiring—never connect AC power to DC terminals. A Southeast Asian customer once made this mistake and fried the motherboard.
Q2: After installing the PLC in a Middle Eastern workshop, it keeps restarting automatically. Is it because of the high temperature?
A: That's almost certainly the case! Workshop temperatures in the Middle East often exceed 55℃ in summer, which is the maximum operating temperature for the FX3 series—overheating causes frequent restarts. The fix is simple: ① Install the PLC in an air-conditioned electrical cabinet, don't leave it exposed to the workshop environment. ② If air conditioning isn't an option, add a cooling fan to the cabinet and put in some desiccant to cool things down and absorb moisture. Also, keep the PLC at least 10cm away from heat sources like inverters and heaters.
Q3: European customers say the PLC's communication protocol is incompatible and can't connect to their PROFINET system. What to do?
A: The FX3 series comes with RS422 and USB as standard, which don't support PROFINET natively. Two solutions: First, install a PROFINET communication module—it plugs directly into the PLC's expansion slot and works right out of the box. Second, ask the customer's MES engineer to use the MODBUS protocol for connection. All FX3 models support MODBUS; no program modifications are needed—just set the register addresses in the software. We fixed this exact issue for a German customer before, and the module got the system up and running the same day.
Q4: In a Southeast Asian textile mill with heavy dust, the PLC's I/O points failed after six months of use. How to fix this?
A: Dust got into the terminal blocks and caused oxidation! Cotton lint and dust in textile mills can seep into the PLC's wiring terminals, leading to poor contact over time. First, cut the power, unplug the wires from the terminals, and blow the terminals clean with a cold-air hair dryer, then spray some anti-rust agent on them. If the I/O points still don't work, you don't need to replace the module—just switch the faulty points to spare ones in the GX Works software. It takes 5 minutes tops. Next time, install a dust filter on the electrical cabinet and clean it regularly.
Q5: Overseas technicians can't use the Japanese/English programming software. How to get them up to speed quickly for debugging?
A: No need to panic. The FX3 supports ladder logic programming, which has a simple interface. Plus, the GX Works software has an English version with almost the same operation logic as the Chinese version. Have the technicians watch a basic tutorial focusing on "wiring configuration" and "program upload/download"—they'll be able to handle simple debugging in half a day. If they still struggle, Mitsubishi has overseas technical support that can assist remotely. Alternatively, hire a local industrial control service provider—most of them are familiar with mainstream PLCs like the FX3, and paid debugging isn't expensive.
Q6: After installation, the PLC shows a "communication timeout" error and can't connect to the HMI. What's the cause?
A: Two common scenarios: First, the communication cable is wired incorrectly. The FX3's RS422 interface uses four wires—mixing up positive and negative polarities will cause issues. Always use shielded cables and route them separately from power cables to avoid interference. Second, IP address conflict. Overseas workshops have lots of equipment, so duplicate IP addresses are common. Switch to a static IP address that doesn't overlap with other devices. We troubleshooted this for a Mexican customer before—changing the IP fixed the connection immediately.
Q7: A South American farm uses the FX3 to control its irrigation system, but the program is lost every time there's a power outage. Why?
A: Most FX3 models use battery-free program storage, so theoretically, programs shouldn't be lost. But rural power grids in South America are unstable—frequent power cuts can cause data corruption. Solutions: ① Install a small UPS for the PLC—it can supply power for a few minutes after an outage, allowing the program to save properly. ② Back up the program to a USB drive regularly—this way, you can restore it quickly if it gets lost. Also, avoid cheap third-party UPS units—unstable voltage from these can damage the PLC.
Q8: During acceptance, European customers say the PLC doesn't have CE certification and won't allow power-on. What to do?
A: All FX3 models have CE certification—you just need to find the right documents! Contact Mitsubishi's overseas office, provide the PLC model and serial number, and they'll send you the official certification papers. Print them out and show them to the customer. Also, make sure the wiring complies with EU standards—for example, the ground wire cross-sectional area should be no less than 2.5mm², and power cables must be routed separately from signal cables. Even with certification, customers might find fault if the wiring is substandard. We helped an Italian customer resolve this issue by providing the certification documents and rectifying the wiring, and the acceptance passed smoothly.
