Description
Core Product Summary
The Mitsubishi Electric FX3U-80MR-ESA is identified with the FX3U family of MELSEC-F programmable logic controllers (PLCs). This 80-point main unit combines 40 digital inputs with 40 relay outputs for machine control applications that require discrete signal processing and relay-based switching. Its AC power supply and DC input configuration make it important to distinguish this model from FX3U variants designed for DC power or transistor outputs.
The controller is intended for integration into an automation system where input devices, output loads, and PLC logic must work together in a defined control sequence. When selecting this unit for a maintenance replacement or a new control panel, confirm the complete model designation, supply voltage, input wiring arrangement, output load requirements, and the expansion hardware used by the existing system.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Mitsubishi Electric |
| Product series | MELSEC-F |
| PLC family | FX3U |
| Product type | Programmable logic controller main unit |
| Model designation | FX3U-80MR/ES-A |
| Integrated I/O points | 80 |
| Digital inputs | 40 points |
| Input signal | 24 V DC |
| Input configuration | Sink/source |
| Digital outputs | 40 points |
| Output type | Relay |
| Power supply | 100–240 V AC |
| Power consumption | 50 W |
| Dimensions (W × H × D) | 285 × 90 × 86 mm |
| Weight | Approximately 1.2 kg |
Engineering Selection Highlights
- 80 integrated I/O points: The 40-input and 40-output configuration provides a defined I/O capacity for discrete machine-control logic.
- 24 V DC digital inputs: Confirm that field sensors and switches match the PLC input voltage and sink/source wiring configuration.
- Relay outputs: Relay switching supports discrete control of compatible external loads. Check the load current, voltage, inrush current, and load type against the applicable output ratings.
- AC power supply: The 100–240 V AC supply requirement distinguishes this model from DC-powered FX3U variants.
- Expandable controller architecture: The FX3U platform supports expansion configurations. Confirm the required expansion modules, system capacity, and hardware compatibility before designing the complete I/O arrangement.
- Defined physical dimensions: The 285 × 90 × 86 mm main-unit dimensions help determine panel space and mounting arrangements.
- Model suffix identification: The
/ES-Adesignation should be checked against the nameplate and existing system documentation before ordering, particularly when replacing a unit identified as FX3U-80MR-ESA.
System Compatibility & Integration Requirements
| Item | Compatibility or Requirement | Practical Note |
|---|---|---|
| Controller family | Mitsubishi Electric MELSEC-F, FX3U series | Confirm that the existing control architecture supports the exact CPU variant. |
| Power supply | 100–240 V AC | Verify the available panel supply and wiring requirements. |
| Input devices | 24 V DC digital input devices | Check polarity, sink/source configuration, and input circuit requirements. |
| Output devices | Loads connected through relay outputs | Confirm individual and aggregate load ratings, external protection, and switching frequency requirements. |
| Expansion hardware | FX3U-compatible expansion configuration | Check module type, placement, system limits, and any additional power requirements. |
| Programming and maintenance | FX-series programming environment appropriate to the installed CPU | Confirm project-file compatibility, communication hardware, and the existing program before commissioning. |
FX3U-80MR-ESA
FX3U-80MR-ESA
Dimensions, Mounting & Connection Notes
The FX3U-80MR/ES-A has a published main-unit envelope of 285 mm wide, 90 mm high, and 86 mm deep, with a weight of approximately 1.2 kg.
During panel design or replacement work:
- Allow sufficient room for wiring, terminal access, ventilation, and maintenance.
- Verify the mounting arrangement against the hardware installation documentation.
- Separate control wiring from power wiring where required by the installation design.
- Size input wiring for the connected field devices and follow the specified terminal requirements.
- Select relay-output protection and suppression according to the connected load.
- Isolate the power supply before wiring or servicing the controller, following the applicable safety procedures.
Detailed Product Overview
PLC Architecture and Control Function
The Mitsubishi Electric FX3U-80MR/ES-A is an FX3U-series PLC main unit designed to coordinate digital field signals and programmed machine operations. Its integrated 40-input and 40-output arrangement provides a single controller platform for acquiring discrete status signals and issuing switching commands.
In a typical control sequence, input devices report machine conditions to the PLC. The CPU evaluates those conditions against the loaded program and updates its outputs accordingly. This architecture is suitable for applications in which equipment operation depends on defined input states, timing logic, interlocks, and sequential decisions.
Input and Output Configuration
The controller combines 24 V DC digital inputs with relay-type outputs. The input arrangement requires attention to the electrical characteristics of the connected sensors and switches, including the selected sink/source configuration.
Relay outputs use electromechanical contacts rather than transistor switching. This distinction matters when selecting loads and designing output circuits. Relay contact ratings, load characteristics, switching frequency, and expected operating cycles must be considered during electrical design. Where loads generate inductive transients, appropriate suppression may also be required.
Power and Panel Integration
The 100–240 V AC supply specification is an important identification point. The power connection and protective measures must follow the installation requirements for the exact hardware version. The unit’s published dimensions also help engineers assess cabinet space, access to terminal blocks, and cable routing.
Before integrating the controller into an existing machine, review the electrical drawings, I/O assignments, CPU configuration, program backup, and connected expansion hardware. Matching the number of I/O points alone does not establish full system compatibility.
Replacement and Procurement Considerations
When sourcing the FX3U-80MR-ESA for maintenance or spare-parts inventory, compare the complete product designation on the controller nameplate with the part number in the equipment bill of materials. Mitsubishi FX3U models can differ in power supply and output technology despite similar model numbering.
For a replacement installation, the most important checks are the supply voltage, input wiring, relay-output requirements, mounting arrangement, expansion configuration, and compatibility of the existing application program. These checks help distinguish a physically similar controller from a suitable replacement for the installed system.
Applications & System Role
The Mitsubishi FX3U-80MR/ES-A functions as a programmable controller for discrete automation tasks. It receives signals from field devices, executes the stored control program, and operates external equipment through its relay outputs.
Typical engineering use cases for this controller configuration include:
- Machine sequencing: Processing limit-switch, push-button, and sensor inputs to coordinate machine operating steps.
- Equipment interlocking: Implementing programmed permissive conditions and operating sequences.
- Relay-based control panels: Switching compatible contactors, indicator circuits, and other control loads through appropriately rated interfaces.
- Material-handling equipment: Coordinating discrete signals associated with conveyors and machine-transfer sequences.
- Equipment maintenance: Replacing a controller in an existing installation when the electrical configuration, I/O allocation, program, and system dependencies are confirmed.
These are functional application scenarios rather than claims of documented installations for this exact model.
Frequently Asked Questions
What is the Mitsubi-ESA?
It is a model designation associated with the Mitsubishi Electric FX3U family of programmable logic controllers. The corresponding catalog designation FX3U-80MR/ES-A identifies an AC-powered controller with 40 digital inputs and 40 relay outputs.
How many I/O points does the FX3U-80MR/ES-A have?
The main unit has 80 integrated I/O points: 40 digital inputs and 40 relay outputs.
What power supply does this PLC require?
The specified FX3U-80MR/ES-A configuration uses a 100–240 V AC power supply. Verify the complete nameplate designation before connecting power.
What type of output does the controller use?
It uses relay outputs. Connected loads must remain within the applicable contact ratings, with external protection selected according to the load and circuit design.
Are the inputs compatible with 24 V DC sensors?
The controller has 40 digital inputs specified for 24 V DC. The sensor wiring and sink/source arrangement must also match the PLC input circuit requirements.
Can the controller be expanded?
The FX3U platform supports expansion hardware and larger I/O configurations. The permitted arrangement depends on the selected expansion modules and system configuration.
What should be checked before replacing an existing FX3U controller?
Check the full model number, power supply, I/O configuration, output type, field wiring, expansion hardware, and stored program. Confirm the exact variant rather than relying on the FX3U family name alone.
Start Chat
