Mitsubishi FX2N-16EX-ES/UL FX2N Series Expansion I/O Modules

Technical Dossier

Product Details And Specifications

Mitsubishi FX2N Series Technical Notes

The Mitsubishi Electric FX2N series represents the second-generation flagship of the MELSEC FX programmable logic controller family. Introduced in the mid-1990s and produced through the 2010s, the FX2N platform achieved widespread deployment across global heavy industry sectors including petrochemical refining, nuclear auxiliary systems, automotive assembly, water treatment, and continuous-process manufacturing. Its compact DIN-rail form factor, deterministic scan-cycle performance, and an extensive catalog of plug-in expansion modules made it the dominant micro-PLC architecture in Asian and European industrial installations for over two decades. The FX2N-16EX-ES/UL is a 16-point DC input expansion module rated for 24 VDC sink/source operation, UL-listed, and designed for direct bus connection to the FX2N main unit via the right-side expansion connector.

FX2N Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the FX2N expansion ecosystem. Each entry reflects the module's primary functional classification and I/O specification.

Digital Input Expansion Modules

• FX2N-16EX-ES/UL: 16-point 24 VDC sink/source input expansion, UL-listed
• FX2N-16EX: 16-point 24 VDC sink input expansion module
• FX2N-32EX: 32-point 24 VDC sink input expansion module
• FX2N-8EX: 8-point 24 VDC sink input expansion module

Digital Output Expansion Modules

• FX2N-16EYR: 16-point relay output expansion module, 2A per point
• FX2N-16EYT: 16-point transistor (sink) output expansion, 0.5A per point
• FX2N-16EYT-ESS/UL: 16-point transistor source output, UL-listed
• FX2N-32EYR: 32-point relay output expansion module
• FX2N-32EYT: 32-point transistor sink output expansion module
• FX2N-8EYR: 8-point relay output expansion module
• FX2N-8EYT: 8-point transistor sink output expansion module

Analog I/O Modules

• FX2N-4AD: 4-channel analog input, 12-bit resolution, ±10V / 4–20mA
• FX2N-4DA: 4-channel analog output, 12-bit resolution, ±10V / 4–20mA
• FX2N-2AD: 2-channel analog input module, 12-bit resolution
• FX2N-2DA: 2-channel analog output module, 12-bit resolution
• FX2N-4AD-PT: 4-channel PT100 RTD temperature input module
• FX2N-4AD-TC: 4-channel thermocouple (K/J type) temperature input module

Communication & Special Function Modules

• FX2N-232-BD: RS-232C communication board, 1-channel, for HMI/PC link
• FX2N-485-BD: RS-485 communication board, supports MODBUS RTU
• FX2N-422-BD: RS-422 communication board for programming port expansion
• FX2N-16CCL-M: CC-Link master module, 16-station control
• FX2N-32CCL: CC-Link remote I/O interface module

High-Speed Counter & Positioning Modules

• FX2N-1HC: 1-axis high-speed counter module, 50 kHz max input
• FX2N-1PG: 1-axis pulse output positioning module, 100 kHz max
• FX2N-10PG: 1-axis advanced positioning module with JOG and home return

Quality Control for the FX2N Range

FX2N expansion modules interface with the main CPU unit via a parallel expansion bus that carries both power and data signals. Failure modes specific to this architecture include bus connector pin corrosion, degraded optocoupler isolation on input channels, and relay contact wear on EYR-type output modules. DriveKNMS applies a structured inspection protocol to all FX2N units: visual inspection of the expansion connector and PCB for corrosion or mechanical damage; functional I/O point verification using a dedicated FX2N test fixture that simulates main-unit bus signals; relay contact resistance measurement on output modules; and insulation resistance testing between I/O terminals and chassis ground. Analog modules (4AD, 4DA, 4AD-PT, 4AD-TC) undergo additional calibration verification against traceable reference standards. Units that do not meet specification thresholds are quarantined and not offered for sale.