What Is the Mitsubishi FX3U-128MR-ES-A?
When your production line demands reliable control with high I/O density, the Mitsubishi FX3U-128MR-ES-A delivers a robust solution. This FX3U base unit from the MELSEC-F SERIES integrates 64 digital inputs (DC 24 V) and 64 relay outputs in a single compact chassis. Powered by AC 100-240 V, it provides a solid foundation for mid-sized automation tasks.
Technical Specifications Breakdown
The FX3U-128MR-ES-A offers a program memory of 64K STEPS using RAM, enabling complex logic sequences. It supports up to 256 local I/O points and 384 local plus remote I/O points, with expandability for future growth. The cycle time for LD instruction is 65 ns and for MOV instruction is 642 ns, ensuring fast processing. Power consumption is 65 W, and the unit includes a buffer battery to retain data. Protection class is IP10, and ambient temperature range is 0 °C to 55 °C. Dimensions are 350 mm width, 90 mm height, and 86 mm depth, with a weight of 1.8 kg.
Industry Applications
In packaging machinery, the FX3U-128MR-ES-A handles numerous sensors and actuators through its 64 inputs and 64 relay outputs. The relay outputs switch inductive loads like motors and solenoids reliably. For material handling systems, the expandable I/O allows adding remote racks without redesigning the control cabinet. The AC 100-240 V power supply simplifies integration into global installations.
Installation Guidance
Mount the FX3U-128MR-ES-A on a DIN rail or panel using the provided slots. Ensure adequate ventilation to stay within the 0 °C to 55 °C ambient range. Connect the AC power supply to the designated terminals, observing local electrical codes. Wire DC 24 V sensors to the input terminals and relay loads to the output terminals, respecting current ratings. Use the RS-422 port for programming or connecting to operator interfaces.
Maintenance and Reliability
Periodically inspect the unit for dust accumulation, as IP10 offers limited protection. Replace the buffer battery every few years to prevent memory loss during power outages. Verify relay output operation by checking contact continuity under load. The 65 W power consumption remains stable under full I/O load, reducing thermal stress.
Compatibility and Integration
The FX3U-128MR-ES-A integrates seamlessly with other MELSEC-F SERIES modules via the expansion bus. It communicates using RS-422 for programming and HMI connections. The USB option allows direct PC connection for setup and monitoring. The unit supports local and remote I/O expansion up to 384 points, making it compatible with distributed control architectures.
Buying Guide
Before purchasing the FX3U-128MR-ES-A, verify your power supply matches AC 100-240 V and your I/O count fits within 64 inputs and 64 outputs. Consider expansion modules if you need more I/O. SpareTechPLC stocks this model and can advise on compatible accessories like programming cables and expansion units. Contact us for current lifecycle status and availability.
Frequently Asked Questions
What is the program memory size of the FX3U-128MR-ES-A?
The FX3U-128MR-ES-A has a program memory of 64K STEPS using RAM.
Can I expand the I/O beyond the built-in 128 points?
Yes, the FX3U-128MR-ES-A supports expansion up to 256 local I/O points and 384 local plus remote I/O points.
What type of outputs does this base unit have?
It has 64 relay outputs, suitable for switching AC or DC loads up to the relay ratings.
Does the unit require a backup battery?
Yes, it includes a buffer battery to retain program and data memory during power loss.
What communication ports are available?
The FX3U-128MR-ES-A includes one RS-422 port and a USB option for programming.
