Product Overview
When a production line demands precise, high-speed control with minimal downtime, the Mitsubishi FX3U-128MT-ES-A delivers. This compact PLC main unit from the MELSEC-F series integrates 64 digital inputs and 64 transistor source outputs, providing a total of 128 I/O points in a single package. For maintenance engineers, this means fewer components to troubleshoot and a streamlined wiring layout that simplifies service.
Technical Specifications Breakdown
Digital Inputs and Outputs
The FX3U-128MT-ES-A offers 64 digital inputs operating at 24 VDC sink/source, compatible with most industrial sensors. Its 64 digital outputs use transistor source logic, ensuring fast switching and long service life without the mechanical wear of relays. This output type is ideal for applications requiring high cycle rates.
Power Supply and Memory
Powered by 100-240 VAC, the unit consumes 65 W and includes a buffer battery to retain program data. The program memory holds 64,000 steps with RAM storage, allowing complex control sequences. Cycle times are 65 ns for LD instructions and 642 ns for MOV instructions, providing rapid logic execution.
Physical and Environmental Design
With dimensions of 350 mm width, 90 mm height, and 86 mm depth, the unit weighs 1.8 kg (or 1.467 kg per specification). It operates in ambient temperatures from 0 °C to 55 °C and carries an IP10 protection rating, suitable for controlled industrial environments.
Industry Applications
Packaging Machinery
In high-speed packaging lines, the FX3U-128MT-ES-A’s transistor outputs drive solenoids and actuators with precise timing. The three integrated pulse outputs enable stepper motor positioning, reducing the need for separate motion controllers.
Material Handling Systems
For conveyor sorting and palletizing, the 64 inputs accommodate numerous sensors, while the expandable architecture supports up to 384 I/O points. Maintenance teams appreciate the LED indicators on each I/O point for quick diagnostics.
Installation & Setup Guidance
Mount the FX3U-128MT-ES-A on a DIN rail or flat surface using the integrated slots. Ensure adequate ventilation around the unit, as ambient temperature should stay within 0 °C to 55 °C. Connect the 100-240 VAC supply to the designated terminals, and wire 24 VDC sensors to the input commons. For transistor outputs, verify the load current does not exceed the module’s rating. Use the RS-422 port for programming or connect an optional RS-485/422/232 interface for networked communication.
Maintenance & Reliability
From a maintenance perspective, the FX3U-128MT-ES-A is built for longevity. The buffer battery preserves program memory during power loss, and the EEPROM memory retains data without battery backup. Inspect the unit periodically for dust accumulation, especially around the ventilation slots. The IP10 rating means it is not sealed against moisture, so keep it in a dry cabinet. Transistor outputs have no moving parts, reducing wear-related failures. For cost-conscious operations, this reliability translates to lower spare parts inventory and fewer emergency service calls.
Compatibility & Integration
The FX3U-128MT-ES-A integrates seamlessly with MELSEC-F series I/O, ADP, and special function modules. It supports expansion up to 384 total I/O points (local plus remote). The integrated RS-422 port allows connection to programming tools, while an optional second RS-485/422/232 interface enables communication with HMIs or other controllers. The unit also accepts memory cassettes for program backup or transfer.
Buying Guide & Purchasing Advice
Before ordering, confirm your system voltage matches the 100-240 VAC supply. Verify that transistor source outputs suit your load requirements—if you need relay outputs, consider other FX3U variants. The FX3U-128MT-ES-A is available at SpareTechPLC, a trusted supplier of industrial automation parts. Contact us to confirm current lifecycle status and availability, as product lifecycles may change.
Frequently Asked Questions
What is the difference between transistor source and sink outputs?
Transistor source outputs (as on the FX3U-128MT-ES-A) provide a positive voltage to the load when activated, while sink outputs connect the load to ground. Choose based on your load and wiring preferences.
Can I expand the I/O beyond 128 points?
Yes, the FX3U series supports expansion up to 384 total I/O points using local and remote modules. The main unit itself integrates 128 points.
How do I program the FX3U-128MT-ES-A?
Use Mitsubishi’s GX Works2 or GX Developer software via the integrated RS-422 port. The 64,000-step memory accommodates complex programs.
What is the operating temperature range?
The unit operates from 0 °C to 55 °C ambient temperature, as specified in the datasheet.
Does the unit include a real-time clock?
Yes, the FX3U-128MT-ES-A has an integrated real-time clock for time-stamping events and scheduling tasks.
