Mitsubishi FX2N-128MR-ES/UL – 128-Point Mixed I/O PLC Main Unit | FX2N Series Platform
Engineering Background: The Mitsubishi FX2N Series represents the pinnacle of the FX compact PLC family, engineered for high-density discrete control in demanding industrial environments. The FX2N-128MR-ES/UL is the largest standard I/O configuration in the FX2N lineup, delivering 64 DC inputs and 64 relay outputs in a single base unit — eliminating the need for expansion modules in most mid-scale applications.
Product Positioning: Designed for procurement engineers and system integrators sourcing a proven, UL-listed compact PLC for machine automation, conveyor systems, and process control panels. The -ES/UL suffix confirms compliance with both European safety standards and UL 508 (Industrial Control Equipment), making this unit suitable for global OEM deployments.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | FX2N-128MR-ES/UL |
| Series | Mitsubishi MELSEC FX2N |
| I/O Configuration | 64 Inputs + 64 Relay Outputs (128 total) |
| Output Type | Relay (MR) |
| Input Voltage | 24 VDC (sink/source) |
| Output Rating | 2A per point, 8A per common |
| Power Supply | 100–240 VAC, 50/60 Hz |
| Program Memory | 8,000 steps (expandable to 16,000 with memory cassette) |
| Processing Speed | 0.08 µs/basic instruction |
| Communication Ports | RS-422 (programming port) |
| Expansion Capability | Up to 8 expansion modules (max 256 I/O total) |
| Built-in Functions | High-speed counters (6 × 60 kHz), pulse output, interrupt inputs |
| Certifications | UL 508, CE (ES/UL suffix) |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -25°C to 70°C |
| Humidity | 5% to 95% RH (non-condensing) |
| Vibration Resistance | 10–57 Hz: 0.075 mm; 57–150 Hz: 9.8 m/s² |
| Weight | Approx. 2,660 g |
| Dimensions (W×H×D) | 480 × 90 × 87 mm |
| Mounting | DIN rail or direct panel mount |
| Country of Origin | Japan |
Proven Application Environments
- Conveyor & Material Handling: High I/O count eliminates expansion modules for most conveyor logic sequences
- Packaging Machinery: Relay outputs drive solenoids, contactors, and pneumatic valves directly
- Injection Molding & Press Control: Interrupt inputs and high-speed counters support position and cycle monitoring
- HVAC & Building Automation: UL listing satisfies North American panel certification requirements
- Water Treatment & Pump Stations: Robust relay outputs handle inductive loads without external relays
- OEM Machine Builders: CE + UL dual certification supports global machine export
Engineering Advantages
- Highest native I/O in FX2N base units — 128 points without any expansion hardware
- Relay output durability — 200,000 mechanical operations; handles mixed AC/DC loads
- Dual certification (CE + UL) — single SKU qualifies for EU and North American markets
- GX Developer & GX Works2 compatible — no additional licensing required for programming
- Backward compatible with FX2N expansion modules, special function units, and communication adapters
- Proven 20+ year field record — extensive third-party documentation, spare parts, and trained integrators globally
System Architecture & Signal Flow
The FX2N-128MR-ES/UL uses a centralized bus architecture with the CPU, power supply, and I/O integrated in one housing. Signal flow:
- Inputs (X0–X77, octal): 24 VDC sink/source; optocoupler isolated; 10 ms default filter (adjustable 0–60 ms)
- Outputs (Y0–Y77, octal): Relay contact; COM terminals grouped in 8-point commons; supports AC and DC loads
- CPU Scan: Sequential ladder scan with interrupt task capability (I0–I8 interrupt inputs)
- Expansion Bus: Right-side edge connector supports up to 8 FX2N expansion units (I/O, analog, communication)
- Programming Interface: RS-422 mini-DIN port; connect via SC-09 cable or USB-SC09-FX adapter
Sourcing & Quality Verification
- Units sourced from authorized Mitsubishi Electric distributors and verified OEM channels
- Each unit inspected for label authenticity, firmware version, and physical integrity prior to shipment
- Traceability documentation (lot number, production date) available on request
- Packaging inspected for tamper evidence; original Mitsubishi anti-counterfeit seals verified
- 30-day functional warranty; long-term supply contracts available for OEM customers
Procurement Process
- Submit RFQ via support@konmask.com or the on-page inquiry form
- Receive stock confirmation and lead time within 24 business hours
- Review proforma invoice; confirm quantity and shipping terms (EXW Xiamen / DDP available)
- Payment via T/T, PayPal, or trade assurance; order confirmed upon receipt
- Shipment via DHL / FedEx with tracking; export documentation (CO, packing list, commercial invoice) included
Technical FAQ
Q: What is the difference between FX2N-128MR and FX2N-128MT?
A: The MR suffix denotes relay outputs; MT denotes transistor (NPN) outputs. Relay outputs handle AC and DC loads and are more robust for inductive loads; transistor outputs offer faster switching (suitable for pulse output applications).
Q: Is the FX2N-128MR-ES/UL still in production?
A: Mitsubishi Electric has transitioned the FX2N series to end-of-life (EOL). However, genuine new-old-stock (NOS) and refurbished units remain available. Konmask.com maintains verified stock — contact us for current availability.
Q: Can I expand beyond 128 I/O points?
A: Yes. Up to 8 FX2N expansion modules can be connected, supporting a maximum of 256 I/O points total.
Q: What programming software is compatible?
A: GX Developer (v8.x+) and GX Works2 both support FX2N. GX Works3 does not support FX2N natively.
Q: What cable is needed to connect a PC?
A: SC-09 RS-422 cable (DB9 to mini-DIN) or a USB-SC09-FX USB adapter. Ensure correct COM port and baud rate (9600 bps default) in GX Developer.
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