Mitsubishi Electric FX2N-128MR-001 MELSEC FX2N Series PLC Main Unit

SKU FX2N-128MR-001

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12-month warranty
Free returns within 30 days

Manufacturer: Mitsubishi Electric
Product No.: FX2N-128MR-001
Country of origin:United States
Product Type: PLC CPU Modules
Payment: T/T, Western Union
Weight: 500g
Dimensions: 350 mm x 110 mm x 90 mm
Shipping port: Xiamen
Warranty: 12 months

Description

Managing up to 128 local I/O points, the Mitsubishi Electric FX2N-128MR-001 serves as a high-density controller within the legacy MELSEC FX2N micro-PLC architecture. This base unit integrates 64 digital inputs (24V DC, sink/source selectable) and 64 relay outputs in a single, space-efficient housing, providing a reliable point of control for high-I/O machinery and assembly lines. Designed to support modular expansion, the unit accommodates FX2N series extension blocks, analog modules, and communications adapters to scale control system capabilities as process demands evolve.

Features

All-in-One High-Density Control: Packs 128 physical input/output terminals in one chassis, reducing cabinet space requirements.
Flexible Input Configuration: Configurable for sink or source logic via a simple hardware terminal connection.
Robust Relay Outputs: Dry contact relay outputs support up to 2A per channel for switching AC or DC control circuit loads.
Expandable Architecture: Built-in bus interface allows seamless connection of additional digital and functional expansion blocks.
Program Memory Cassette Support: Includes a slot for optional EEPROM or Flash memory cassettes for easy program backup and transfer.

Applications

Material Handling Systems: Conveyor sorting, palletizer control, and multi-station transfer tables.
Packaging Machinery: Multi-lane filling, form-fill-seal machines, and heavy carton sealing plants.
Automotive Assembly Cells: Coordinating pneumatic actuators, rotary tables, and localized safety interlocks.
Municipal Water Management: Multi-pump control stations with auxiliary monitoring elements.

Technical Specifications

Parameter	Specification Value
Manufacturer	Mitsubishi Electric
Model Number	FX2N-128MR-001
Series Name	MELSEC FX2N
Supply Voltage	100 to 240 V AC (+10% / -15%), 50/60 Hz
Power Consumption	100 VA
Integrated Inputs	64 Channels (24V DC, 7mA, Sink/Source selectable)
Integrated Outputs	64 Channels (Relay contacts, 2A/point, 8A/common)
Response Time (Inputs)	Approx. 10 ms (adjustable via software filters)
Response Time (Outputs)	Approx. 10 ms (mechanical relay drop-out / pull-in)
Programming Language	Instruction List (IL), Ladder Logic (LD), SFC
Operating Temperature	0 to 55 Celsius
Country of Origin	Japan
Shipping Weight (Calculated)	3.0 kg
Package Dimensions (Calculated)	350 mm x 110 mm x 90 mm

Terminal Layout & Circuit Configuration

Terminal Block Section	Terminal Label	Functional Assignment
Power & Ground	L, N, PE	100-240V AC Line, Neutral, and Protective Earth connections
Service Power Supply	24V, 0V	24V DC auxiliary power output for external sensors (max 460mA)
Input Logic Common	S/S	Sink / Source selection terminal (connect to 24V or 0V)
Digital Inputs	X0 to X77	64 octal-addressed digital inputs (X0-X7, X10-X17... X70-X77)
Digital Outputs	Y0 to Y77	64 octal-addressed dry relay contacts grouped by common terminals

Alternative Models & Compatibility

The FX2N series is a legacy line. When updating systems utilizing the FX2N-128MR-001, the direct, modern replacement from Mitsubishi Electric is the FX3U-128MR/ES-A. While the FX3U model features structural and dimension alignment for easy retrofitting, there are critical considerations:

Program Migration: Legacy programs from FX2N can be converted to FX3U format inside GX Developer or GX Works2/3 software. Be sure to review instruction sets since execution times on FX3U are significantly faster, which can impact legacy software-timed loops.
Terminal Block Wiring: Terminal block layouts are nearly identical, but terminal pitch and physical width of the modules should be cross-verified before swapping to ensure panel depth clearing.

Application Pitfalls & Engineering Notes

Relay Contact Derating: Inductive AC loads (solenoids, contactors) create large voltage spikes at drop-out. For maximum relay lifetime, install surge absorbers (RC networks) parallel to the load. For DC inductive loads, always install a freewheeling diode.
Thermal Management: In enclosed control panels, always mount this high-I/O unit horizontally to ensure convective airflow. Vertical mounting restricts airflow and can lead to premature thermal degradation of the internal power supply module.
Inrush Current: The 100-240V AC power supply block has an inrush current rating that can reach up to 40A at peak. Ensure upstream circuit breakers are sized with a suitable delay curve to prevent nuisance tripping on power-up.

Installation Guidelines

CRITICAL WARNING:

Risk of severe electrical shock. Completely disconnect and isolate all AC and DC external power sources before opening terminal covers or performing wiring. Failure to do so can result in equipment destruction, fire, or severe injury.

1

Mount the unit on a standard 35mm DIN rail or secure it directly to the cabinet backplate using the integrated screw mounting holes. Always maintain a minimum clearance of 50mm on all sides of the unit for heat dissipation.

2

Terminate the AC power feed (L and N) and protective earth ground (PE). Ensure a low-resistance chassis ground path to mitigate high-frequency electrical noise.

3

Wire the S/S (Sink/Source) terminal. For sink configuration, jumper the S/S terminal to the 24V terminal. For source configuration, jumper S/S to the 0V terminal.

4

Verify all wire connections and terminal block screws are tightened to the specified torque rating (0.5 to 0.8 N-m) before applying power to prevent terminal overheating.

FAQ

Can the digital input logic on this PLC be configured for both sink and source wiring?

Yes. The digital input logic is determined by the connection of the 'S/S' (Sink/Source) terminal. Connecting the S/S terminal to the internal 24V terminal configures the physical inputs for sink logic, while connecting it to the 0V terminal configures them for source logic.

What is the direct modern replacement for a failed controller of this model?

The direct replacement path is the Mitsubishi FX3U-128MR/ES-A. It maintains physical structural alignment and matching I/O count, though you must migrate and compile the logic program through GX Developer or GX Works2/3.

How should the internal relay outputs be protected when controlling inductive loads?

For AC inductive loads like solenoids or contactors, connect a surge absorber (RC network) in parallel with the load. For DC inductive loads, install a freewheeling diode to suppress voltage spikes and prevent premature contact wear.

Does this base unit provide external power for field devices?

Yes, it features a built-in 24V DC service power supply output (terminals 24V and 0V) that can supply up to 460mA of auxiliary current to power external sensors and input switches.

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Global Express Shipping

Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our professional technical warranty.

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