When selecting a programmable logic controller (PLC) for your industrial automation project, choosing the right model can directly impact system stability, scalability, and long-term support. Mitsubishi’s FX series PLCs—particularly the FX2N and FX3U—are widely used across various industries due to their robust performance and flexible configuration. But which one fits your application best?
In this article, we break down the key differences between the FX2N and FX3U PLCs to help you make an informed decision. Whether you’re upgrading an existing system or building a new one, HY-TECH offers compatible solutions, expert guidance, and reliable supply support.
✅ Overview of the FX2N PLC
The Mitsubishi FX2N PLC is part of the second generation of the FX family. It’s known for its:
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Stable performance in basic control systems
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Compact design with expandable I/O
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Support for simple analog and communication modules
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Cost-effective solution for smaller-scale automation
Key Specs:
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Maximum I/O points: Up to 256 (with expansion)
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Execution speed: 0.55 μs per instruction
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Memory capacity: 8k steps
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Compatible with FX-series special function modules
Typical Applications:
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Basic machine control
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Packaging systems
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Light-duty HVAC automation
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Educational or training systems
Though the FX2N is now discontinued by Mitsubishi, many industrial systems still run on this trusted model. HY-TECH continues to provide tested and in-stock FX2N CPUs, modules, and accessories for replacement or system expansion.
✅ Overview of the FX3U PLC
The Mitsubishi FX3U PLC is a more advanced and scalable model introduced as the next generation in the FX family. It retains backward compatibility while offering significant performance upgrades.
Advantages:
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Faster processing speeds and enhanced performance
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Improved memory and data handling
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Built-in high-speed counters and pulse outputs
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Ethernet, USB, and RS-485 communication interfaces
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Support for structured programming and advanced instructions
Key Specs:
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Maximum I/O points: Up to 384
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Execution speed: 0.065 μs per instruction
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Memory capacity: 64k steps
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Enhanced networking and communication capabilities
Typical Applications:
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Complex automation systems
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Multi-axis motion control
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Process control in food, chemical, and pharmaceutical industries
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Factory-wide distributed control networks
HY-TECH offers both original and compatible FX3U series modules, as well as system integration support to ensure smooth setup and performance.
🔄 FX2N vs FX3U: Side-by-Side Comparison
| Feature | FX2N | FX3U |
|---|---|---|
| CPU Speed | 0.55 μs/instruction | 0.065 μs/instruction |
| Max I/O Points | 256 | 384 |
| Memory Capacity | 8k steps | 64k steps |
| Communication Ports | Limited (RS-232/RS-422 add-on) | Built-in USB, RS-485, Ethernet support |
| Expansion Modules | Supported | Supported + advanced modules |
| Status | Discontinued (still widely in use) | Active production & fully supported |
| Application Complexity | Basic to moderate | Moderate to complex |
| Future Scalability | Limited | Excellent |
🛠 Should You Choose FX2N or FX3U?
👉 Choose FX2N if:
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You need a cost-effective replacement in an existing FX2N-based system
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Your application is simple and doesn’t require complex communication or fast processing
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You’re maintaining or expanding legacy automation setups
HY-TECH continues to stock and support the FX2N series, including CPUs, I/O modules, and special function units, ensuring legacy systems remain operational.
👉 Choose FX3U if:
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You’re building a new control system or upgrading for speed and scalability
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Your project requires high-speed processing or network integration
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You need future-proof hardware with ongoing software and firmware support
HY-TECH supplies genuine and compatible FX3U PLCs with customization and support services to match your industrial requirements.
💡 Why Buy Mitsubishi PLCs from HY-TECH?
HY-TECH is your trusted source for industrial automation components, including Mitsubishi PLCs, modules, and accessories. Here’s what we offer:
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✅ Full inventory of FX2N and FX3U models
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✅ Competitive pricing on both original and compatible modules
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✅ Fast delivery with global shipping options
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✅ Expert technical support for installation, programming, and upgrades
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✅ Custom sourcing for hard-to-find or discontinued parts
Whether you’re running a long-established FX2N system or migrating to the FX3U platform, HY-TECH helps you stay ahead.
Both the FX2N and FX3U PLCs are reliable Mitsubishi solutions, but they serve different use cases. If you’re operating legacy systems or need basic control, the FX2N remains a practical choice. For new, performance-driven applications, the FX3U is the better fit. No matter which model fits your needs, HY-TECH provides the hardware, support, and expertise to keep your automation running smoothly.