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Mitsubishi Electric MELSEC-Q · Modular CPU

Mitsubishi Q03UDECPU

Order number 217899

Normal sale of the Q03UDECPU has ended. Spares may still be available, but the clock is running.

  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: Cancellation.

Is the Mitsubishi Electric Q03UDECPU discontinued?

On ECS's lifecycle assessment, the Q03UDECPU has been cancelled: no longer sold as a current product, though spares may remain available for a period.

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 Cancellation means for you

You can no longer order it as a normal product, and nothing new should be designed around it. If machines depend on it, you want spare stock you can rely on and a migration plan. Both start with knowing how many you run and whether each has a backup.

How ECS defines Cancellation · 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

Q03UDECPU part details

Manufacturer
Mitsubishi Electric
Range
MELSEC-Q
Summary
PLC Q Series iQ CPU module; 4096 I/O; 20 ns/com.; 30k steps; Ethernet int. Number of I/O points: 4096, number of I/O device points: 8192, program capacity: 30K steps, basic operation processing speed (LD X0): 20 ns, program memory capacity: 120K bytes, multi-CPU high-speed communication, external interface: USB/Ethernet, with memory card interface End of order date: 09/2026 Discontinued date:10/2026 Repair support expiration date: 10/2033 Replacement: Q03UDVCPU / R04CPU
Programming software
GX Works 3
Software versions
Held in Command Centre, matched to firmware

Common questions about the Q03UDECPU

Is the Mitsubishi Electric Q03UDECPU discontinued?

On ECS's lifecycle assessment, the Q03UDECPU has been cancelled: no longer sold as a current product, though spares may remain available for a period.

Can I still buy a Q03UDECPU?

Not as a normal new product. Remaining distributor stock or designated spares may still be available. Buy any you need now.

How do I back up a Q03UDECPU?

It is programmed with GX Works 3. 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 Q03UDECPU 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-Q parts

All Mitsubishi Electric parts · All manufacturers