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Mitsubishi Electric MELSEC-F FX3 · PLC - CPU

Mitsubishi FX3U-64MR/DS

Order number 231501

ECS rates the FX3U-64MR/DS as phase-out: still orderable, but on its way out. This is the time to plan, not panic.

  1. Active RolloutSold and supported normally
  2. Phase OutRetirement announced, still orderable
  3. CancellationNormal sale ended, spares may remain
  4. Total DiscontinuationNo manufacturer supply or repair

ECS stage: Phase Out.

Is the Mitsubishi Electric FX3U-64MR/DS being discontinued?

On ECS's lifecycle assessment, the FX3U-64MR/DS is in phase-out: still orderable for now, but on its way out.

Source: ECS lifecycle assessment, based on ECS's internal lifecycle data in Command Centre. Last checked . Always confirm a specific part's status with the manufacturer before buying or planning a migration.

What Phase Out means for you

The manufacturer is retiring the part, but you can still buy it. Nothing needs ripping out. Four things are worth doing while it is still easy: find every unit you run, make sure each has a current backup, decide whether to hold spares, and price the move.

How ECS defines Phase Out · all four lifecycle stages

Before replacing a PLC processor

We would secure a current, tested PLC program backup, record the programming software and version, and map the I/O, networks and intelligent modules connected to the controller.

CPU migrations can alter addressing, communications, memory behaviour or firmware requirements, so a newer processor in the same general family is not automatically a drop-in replacement. Proving that the program can actually be restored while the existing controller still runs is one of the most valuable checks a maintenance team can make.

ECS engineering guidance

FX3U-64MR/DS part details

Manufacturer
Mitsubishi Electric
Range
MELSEC-F FX3
Summary
Base Unit DC 24V;32 inputs (24V DC), 32 relay outputs Order acceptance to 31 March 2028 - Discontinuation 30 September 2028 - Repair support until 30 September 2035
Programming software
GX Works 2
Software versions
Held in Command Centre, matched to firmware

Common questions about the FX3U-64MR/DS

Is the Mitsubishi Electric FX3U-64MR/DS being discontinued?

On ECS's lifecycle assessment, the FX3U-64MR/DS is in phase-out: still orderable for now, but on its way out.

Can I still buy a FX3U-64MR/DS?

Yes, through normal channels during the phase-out period. It is the cheapest point to buy any spares you want to hold.

How do I back up a FX3U-64MR/DS?

It is programmed with GX Works 2. The exact software version and cable depend on the unit's firmware. ECS records both for every unit it captures, alongside a verified backup.

An ECS engineer capturing a control panel on a tablet: PLC, drive and power supply identified and synced to Command Centre

With a backup, a failed unit is hours. Without one, it is days.

A Capture audit finds every FX3U-64MR/DS on your site, takes a backup of each one it can reach, and records the software version and cable needed to restore it. When a discontinued unit fails and a replacement turns up, the program is ready to load.

  • Every device located, photographed and lifecycle-checked
  • Backups taken on the day, with software version and cable recorded
  • Findings report, plus a populated Command Centre
  • No production downtime
See how Capture works

Other MELSEC-F FX3 parts

All Mitsubishi Electric parts · All manufacturers