Mitsubishi FX2 Series Modules – FX2-128MR

Technical Dossier

Product Details And Specifications

Mitsubishi FX2 Series Technical Notes

The Evolution of FX2 Architecture

The FX2 series succeeded the original FX and FX0 platforms, introducing an enhanced instruction set, extended program memory (up to 8,000 steps), and improved high-speed counter performance (up to 60 kHz). The base unit integrates both CPU and I/O into a single housing, with expansion achieved via the FX2-EX extension bus. Communication capability was extended through dedicated adapter modules supporting RS-232C, RS-485, and early CC-Link implementations.

The FX2 architecture uses a parallel ladder logic execution model with a scan cycle typically between 0.08 µs and 0.18 µs per step. Power supply variants include 100–240 VAC and 24 VDC input models. Output configurations span relay (MR suffix), transistor sink (MT suffix), and transistor source (MS suffix) types. The FX2 series has been superseded by the FX2N, FX3U, and FX5U generations, each introducing expanded memory, faster CPUs, and native Ethernet connectivity. However, the FX2 platform remains in active service at thousands of installed sites where full system replacement is not economically viable, creating sustained demand for spare and replacement modules.

FX2 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced models within the Mitsubishi FX2 series. Models are classified by functional category.

Base CPU Units (Relay Output)

• FX2-16MR: 8 DC inputs / 8 relay outputs, compact base unit, 100–240 VAC power
• FX2-32MR: 16 DC inputs / 16 relay outputs, standard base unit, 100–240 VAC power
• FX2-48MR: 24 DC inputs / 24 relay outputs, mid-range base unit, relay output type
• FX2-64MR: 32 DC inputs / 32 relay outputs, high-density relay output base unit
• FX2-80MR: 40 DC inputs / 40 relay outputs, extended I/O relay base unit
• FX2-128MR: 64 DC inputs / 64 relay outputs, maximum-density relay output base unit, 100–240 VAC

Base CPU Units (Transistor Output)

• FX2-16MT: 8 DC inputs / 8 transistor sink outputs, high-speed pulse output capable
• FX2-32MT: 16 DC inputs / 16 transistor sink outputs, pulse output for servo/stepper
• FX2-48MT: 24 DC inputs / 24 transistor sink outputs, mid-range transistor base unit
• FX2-64MT: 32 DC inputs / 32 transistor sink outputs, high-density transistor output
• FX2-80MT: 40 DC inputs / 40 transistor sink outputs, extended I/O transistor unit
• FX2-128MT: 64 DC inputs / 64 transistor sink outputs, maximum-density transistor base unit

Analog & Special Function Extension Modules

• FX2-4AD: 4-channel analog input module, 12-bit resolution, ±10 V / 4–20 mA selectable
• FX2-2DA: 2-channel analog output module, 12-bit resolution, voltage/current output
• FX2-4AD-PT: 4-channel PT100 RTD temperature input module, direct sensor connection

Communication & Networking Modules

• FX2-232IF: RS-232C communication interface module, serial data exchange with HMI/SCADA
• FX2-485ADP: RS-485 adapter for multi-drop network topology, up to 32 nodes

Quality Control for the FX2 Range

FX2 series base units integrate CPU, power supply, and I/O on a shared PCB assembly with a proprietary backplane bus. Quality verification for these units requires functional testing beyond basic power-on checks. DriveKNMS applies the following test protocol to all FX2 units prior to shipment: