Mitsubishi Electric FX3U-80MR/ES-A MELSEC-F PLC Main Unit
An FX3U programmable-controller main-unit reference with integrated digital I/O and relay outputs.
Product Profile
FX3U-80MR/ES-A is retained as the submitted Mitsubishi Electric PLC reference. Its FX3U-80MR/ES base execution is an AC-powered main unit; the final -A suffix should be verified from the physical label and regional order record.
Replacement requires the program, parameter memory, expansion layout and field-load details. The PLC main unit is only one part of the installed MELSEC-F control system.
Technical Data
| Manufacturer | Mitsubishi Electric |
|---|---|
| Submitted Model | FX3U-80MR/ES-A |
| Base Model | FX3U-80MR/ES |
| Product Family | MELSEC-F FX3U |
| Integrated I/O | 80 points |
| Digital Inputs | 40 sink/source points |
| Digital Outputs | 40 relay points |
| Power Supply | 100–240 V AC |
| Power Consumption | 50 W |
| Lifecycle Note | Regional order status and migration timing must be checked |
System Role
- Executes the user program and controls the integrated and expansion I/O assigned to the machine.
- Provides relay-output switching for documented field loads through the existing wiring design.
- Coordinates special-function and communication modules within the supported FX3U system limits.
- Maintains the installed program and device-memory behavior during controlled service replacement.
Compatibility
- Confirm the final suffix, hardware version and regional execution from the unit label.
- Inventory every expansion module, adapter, memory device and communication interface in order.
- Check relay-load voltage, current, inrush and suppression before transferring outputs.
- Review the migration path to current MELSEC iQ-F hardware when long-term support is required.
Applications
- Compact machine and sequence control with mixed digital I/O.
- Relay control of contactors, valves and indicators within rated circuits.
- Maintenance of installed FX3U automation systems.
FAQ
How should the final suffix on FX3U-80MR/ES-A be verified?
Compare the complete physical label and regional order record because the base manual identifies FX3U-80MR/ES while the submitted string includes an additional suffix.
What must be backed up before replacing FX3U-80MR/ES-A?
Save the PLC program, parameters, comments, device memory, passwords and any special-module settings using the compatible engineering environment.
Can a transistor-output FX3U replace FX3U-80MR/ES-A?
Not without redesign: the output electrical behavior, wiring, polarity and connected loads differ from the relay-output execution.
What expansion information is needed for FX3U-80MR/ES-A?
Provide the left and right module order, adapter boards, powered extensions, communication modules and current-consumption calculation.
Which migration risks matter for FX3U-80MR/ES-A?
Review instruction support, I/O addressing, scan timing, analog and communication modules, wiring conversion and startup validation before moving to a newer PLC.
What should be tested after installing FX3U-80MR/ES-A?
Verify program integrity, startup mode, every input, each relay load, communications, safety interlocks and controlled machine sequencing.
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