Mitsubishi FX2NC Series Modules: FX2NC-32EX

Technical Dossier

Product Details And Specifications

Mitsubishi Electric FX2NC Series: Comprehensive Module Range and Technical Overview

The Mitsubishi Electric FX2NC series is a compact, high-density programmable logic controller (PLC) platform deployed across global heavy industry sectors including petrochemical processing, refinery automation, nuclear auxiliary systems, and continuous manufacturing lines. Its ultra-compact form factor — achieved through a connector-type terminal block design — made it the preferred embedded controller for space-constrained OEM machine builders and system integrators throughout the 2000s and 2010s. Installed base remains substantial across Asia-Pacific, Europe, and the Middle East, making reliable spare parts availability a critical operational requirement for plant maintenance teams.

The Evolution of FX2NC Architecture

The FX2NC was introduced as a connector-terminal derivative of the FX2N base platform, sharing the same instruction set (209 basic + applied instructions) and ladder/SFC programming model but reducing panel footprint by approximately 50% through the elimination of screw-terminal I/O blocks in favor of direct connector interfaces. This architectural decision created a distinct compatibility boundary: FX2NC expansion modules are not directly interchangeable with standard FX2N expansion units without the use of the FX2NC-CNV-IF conversion adapter.

The series operates on the MELSEC FX communication protocol stack, supporting RS-232C and RS-485 interfaces natively, with optional CC-Link, PROFIBUS-DP, and DeviceNet connectivity via dedicated communication modules. Program memory ranges from 8K to 16K steps depending on CPU variant, with data register capacity of D0–D7999 and auxiliary relay capacity of M0–M3071.

As the FX3UC and subsequently the FX5UC platforms were introduced, Mitsubishi Electric formally transitioned the FX2NC to end-of-life status. However, the installed base scale means that FX2NC components remain in active demand for corrective and preventive maintenance through at least the mid-2030s under extended lifecycle support programs.

FX2NC Full Catalog & Functionalities (SKU List)

CPU / Main Units

• FX2NC-16MR-T: 8DI/8DO relay output CPU, 8K step, connector terminal
• FX2NC-32MT-T: 16DI/16DO transistor sink output CPU, 8K step
• FX2NC-64MT-T: 32DI/32DO transistor sink output CPU, 16K step
• FX2NC-96MT-T: 48DI/48DO transistor sink output CPU, 16K step

Digital Input (DI) Expansion Modules

• FX2NC-16EX: 16-point 24VDC digital input expansion module
• FX2NC-32EX: 32-point 24VDC digital input expansion module, sink/source compatible, connector terminal, 5VDC bus powered

Digital Output (DO) Expansion Modules

• FX2NC-16EYR: 16-point relay output expansion module, 2A/point
• FX2NC-16EYT: 16-point transistor sink output expansion module
• FX2NC-32EYT: 32-point transistor sink output expansion module

Mixed Digital I/O Expansion Modules

• FX2NC-32EX-DS: 32-point digital input, DC source type, connector terminal
• FX2NC-16EX-T: 16-point digital input, connector terminal variant

Analog I/O Modules

• FX2NC-4AD: 4-channel analog input, 12-bit resolution, ±10V / 4–20mA
• FX2NC-2DA: 2-channel analog output, 12-bit resolution, ±10V / 4–20mA
• FX2NC-4AD-PT: 4-channel PT100 RTD temperature input module
• FX2NC-4AD-TC: 4-channel thermocouple (K/J type) temperature input module

Communication & Interface Modules

• FX2NC-232ADP: RS-232C communication adapter for serial device connectivity
• FX2NC-485ADP: RS-485 multi-drop communication adapter
• FX2NC-CNV-IF: Conversion interface adapter, FX2NC to FX2N expansion bus

Power Supply & Accessory Modules

• FX2NC-PS-5V: Auxiliary 5VDC power supply unit for extended I/O bus

Sourcing Hard-to-Find & Obsolete FX2NC Parts

The FX2NC series has been formally discontinued by Mitsubishi Electric, with new production of most modules having ceased. Standard distribution channels no longer carry stock for the majority of FX2NC expansion modules, including the FX2NC-32EX. DriveKNMS maintains a dedicated inventory of tested, pull-from-service, and new-old-stock (NOS) FX2NC components sourced through verified industrial surplus and OEM decommissioning channels globally.

For plant operators running FX2NC-based control systems, DriveKNMS provides: verified replacement units with full functional test documentation, cross-reference support for identifying compatible FX3UC/FX5UC migration paths where direct replacement is unavailable, and long-term supply agreements for maintenance contractors managing multi-site FX2NC installations. All units are shipped with test reports and carry a 12-month warranty against functional defects.

Quality Control for the FX2NC Range

FX2NC modules present specific test challenges due to their connector-type bus interface and compact PCB architecture. DriveKNMS applies a structured test protocol for all FX2NC units prior to dispatch:

• Bus communication verification: Each module is installed on a live FX2NC CPU test rig and verified for correct I/O refresh across the full point count (e.g., all 32 points for the FX2NC-32EX).
• Connector integrity inspection: The proprietary connector terminals are inspected under magnification for pin deformation, oxidation, and contact resistance measurement.
• Isolation resistance test: Input/output channel isolation is verified at 500VDC to confirm no inter-channel leakage.
• Firmware and parameter retention: For CPU units, program memory and parameter registers are verified for read/write integrity.
• Thermal cycling: Units are cycled through operational temperature range (0°C to 55°C) to screen for intermittent contact failures common in aged connector-type modules.