Mitsubishi FX2N Series Modules FX2N-128MR-ES/UL

Technical Dossier

Product Details And Specifications

Mitsubishi Electric FX2N Series Technical Notes

The Mitsubishi Electric MELSEC FX2N series represents one of the most widely deployed compact PLC platforms in global heavy industry. Installed across petrochemical complexes, nuclear auxiliary systems, refinery process lines, and continuous manufacturing facilities, the FX2N platform established a benchmark for high-density I/O integration within a compact DIN-rail footprint. Its 16-bit CPU architecture, high-speed pulse output capability (up to 100 kHz), and broad expansion module ecosystem made it the preferred controller for machine OEMs and system integrators throughout the 1990s and 2000s. Installed base estimates place FX2N units in active service across Asia-Pacific, Europe, and the Americas, with a significant proportion operating in legacy environments where replacement with newer platforms is constrained by engineering cost or process continuity requirements.

The Evolution of FX2N Architecture

The FX2N series succeeded the FX2 and FX0N platforms, introducing an expanded instruction set (over 200 basic and applied instructions), a faster scan cycle, and support for up to 256 I/O points on the base unit with expansion to 512 points via extension modules. The internal bus architecture uses a proprietary Mitsubishi backplane protocol incompatible with the later FX3U and FX5U generations, which is a critical consideration for maintenance engineers planning partial upgrades. FX2N units communicate via RS-422 (programming port) and support optional RS-232C and RS-485 adapters. The series entered end-of-life status in the mid-2010s, with Mitsubishi Electric formally recommending migration to the FX5U platform. However, the installed base remains substantial, and long-term spare parts support is a documented operational requirement for facilities with 10–20 year maintenance cycles.

FX2N Full Catalog & Functionalities (SKU List)

Main CPU / Base Units

• FX2N-16MR-ES/UL: 8 DC input / 8 relay output base unit, 16 I/O points total.
• FX2N-32MR-ES/UL: 16 DC input / 16 relay output base unit, 32 I/O points total.
• FX2N-48MR-ES/UL: 24 DC input / 24 relay output base unit, 48 I/O points total.
• FX2N-64MR-ES/UL: 32 DC input / 32 relay output base unit, 64 I/O points total.
• FX2N-80MR-ES/UL: 40 DC input / 40 relay output base unit, 80 I/O points total.
• FX2N-128MR-ES/UL: 64 DC input / 64 relay output base unit, 128 I/O points total — mixed/combined digital I/O unit.
• FX2N-32MT-ESS/UL: 16 DC input / 16 transistor (sink) output, high-speed pulse output to 100 kHz.
• FX2N-64MT-ESS/UL: 32 DC input / 32 transistor (sink) output base unit.

Digital Input (DI) Expansion Modules

• FX2N-16EX: 16-point DC 24V digital input expansion module.
• FX2N-32EX: 32-point DC 24V digital input expansion module.

Digital Output (DO) Expansion Modules

• FX2N-16EYR: 16-point relay output expansion module, 2A per point.
• FX2N-16EYT: 16-point transistor (source) output expansion module.
• FX2N-32EYR: 32-point relay output expansion module.

Analog I/O Modules (AI/AO)

• FX2N-4AD: 4-channel analog input module, 12-bit resolution, ±10V / 4–20mA selectable.
• FX2N-4DA: 4-channel analog output module, 12-bit resolution, ±10V / 4–20mA selectable.
• FX2N-8AD: 8-channel analog input module, 12-bit resolution.
• FX2N-2AD: 2-channel analog input, compact form factor for space-constrained panels.
• FX2N-2DA: 2-channel analog output module.

Communication & Network Adapters

• FX2N-232-BD: RS-232C communication board, mounts directly to CPU unit.
• FX2N-485-BD: RS-485 communication board for multi-drop network configurations.
• FX2N-CNV-BD: Conversion board for connecting FX0N/FX2 expansion modules to FX2N base units.
• FX2N-16CCL-M: CC-Link master module, supports up to 64 remote I/O stations.

Special Function Modules

• FX2N-1PG: Single-axis pulse generator module for open-loop positioning control.
• FX2N-10PG: High-speed single-axis positioning module, 1 MHz pulse output.
• FX2N-1RM-SET: Remote maintenance module for dial-up modem communication.