Mitsubishi FX2N Series Modules - FX2N-16EYT

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 architecture supports up to 256 I/O points via extension modules, with a base unit scan time of 0.08 µs per basic instruction — a specification that positioned it as a high-performance controller for its generation. The FX2N series remains operational in thousands of legacy installations worldwide, making spare part availability and lifecycle management a critical operational concern for plant engineers and maintenance teams.

The Evolution of FX2N Architecture

The MELSEC FX family originated with the F series in the early 1980s, progressing through FX, FX2, FX2C, and FX2N generations. The FX2N, introduced in the mid-1990s, replaced the FX2 with a 32-bit internal bus, expanded special function module support, and a standardized extension connector interface. It introduced compatibility with the FX2N-CNV-BC bus converter, enabling mixed deployment with FX0N and FX2NC modules. The FX3U and FX3G series succeeded the FX2N in the 2000s, offering USB programming ports, built-in positioning functions, and higher-speed counters. However, the FX2N remains in active service due to its installed base, and Mitsubishi Electric officially declared end-of-sale for most FX2N base units and extension modules, transitioning support to the FX3 and iQ-F (FX5U) platforms. For facilities still operating FX2N infrastructure, sourcing certified replacement modules is the primary maintenance strategy.

FX2N Full Catalog & Functionalities (SKU List)

Digital Output Modules

• FX2N-16EYT: 16-point transistor sink output extension module, 0.5A per point, 24VDC load
• FX2N-16EYR: 16-point relay output extension module, 2A per point, AC/DC load
• FX2N-32EYT: 32-point transistor sink output extension module, high-density output block
• FX2N-32EYR: 32-point relay output extension module, mixed AC/DC application
• FX2N-16EYS: 16-point triac (solid-state) output module, AC load switching

Digital Input Modules

• FX2N-16EX: 16-point 24VDC sink/source input extension module
• FX2N-32EX: 32-point 24VDC input extension module, high-density input block
• FX2N-16EX-ES/UL: 16-point input module with UL/CE certification variant

Combined I/O Modules

• FX2N-32ER: 16-point input / 16-point relay output combined extension module
• FX2N-48ER: 24-point input / 24-point relay output combined extension module
• FX2N-48ET: 24-point input / 24-point transistor output combined extension module

Analog Modules

• FX2N-4AD: 4-channel analog input module, 12-bit resolution, voltage/current selectable
• FX2N-4DA: 4-channel analog output module, 12-bit resolution, ±10V / 4–20mA
• FX2N-8AD: 8-channel analog input module, high-channel-count process monitoring
• FX2N-2AD: 2-channel analog input module, compact analog acquisition
• FX2N-2DA: 2-channel analog output module, compact analog control

Communication & Network Modules

• FX2N-232-BD: RS-232C communication board, serial HMI and device interfacing
• FX2N-485-BD: RS-485 communication board, multi-drop network support
• FX2N-422-BD: RS-422 communication board, programming port expansion
• FX2N-CNV-BD: Conversion board for FX2N special adapter connection

Positioning & High-Speed Modules

• FX2N-1PG: Single-axis pulse output positioning module, open-loop servo control
• FX2N-10PG: High-speed single-axis positioning module, 1MHz pulse output
• FX2N-1HC: High-speed counter module, 50kHz 2-phase input

Quality Control for the FX2N Range

FX2N modules use a proprietary extension bus connector and backplane communication protocol. Testing procedures at DriveKNMS include: functional I/O point verification under rated load conditions, bus communication integrity check using a reference FX2N base unit, analog module calibration verification against factory tolerance bands (±0.5% for FX2N-4AD/4DA), and output transistor leakage current measurement for EYT-type modules. Relay output modules (EYR-type) undergo contact resistance measurement and minimum 50-cycle switching endurance verification. Communication boards are tested for baud rate stability and signal integrity across the full specified cable length. Each unit is issued a test record prior to shipment.