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Mitsubishi Electric MELSEC-AnS · Modular CPU

Mitsubishi A1SJCPU-S3

The A1SJCPU-S3 is no longer supplied by Mitsubishi Electric. If one fails, the program is what gets you running again.

  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: Total Discontinuation.

Is the Mitsubishi Electric A1SJCPU-S3 discontinued?

On ECS's lifecycle assessment, the A1SJCPU-S3 is discontinued and no longer supplied by Mitsubishi Electric.

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 Total Discontinuation means for you

The manufacturer has finished with the part. You may still find one through surplus or refurbished sellers, or in another site's stores, but that is not a supply chain. When a unit fails, your options are to find one and restore the program onto it, or to migrate the machine.

Both routes start in the same place: having the program. Without a backup, a found spare is just hardware.

How ECS defines Total Discontinuation · 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

A1SJCPU-S3 part details

Manufacturer
Mitsubishi Electric
Range
MELSEC-AnS
Name
MELSEC-A AnS Series CPU Module with Integrated Power Supply and Main Base Unit
Summary
Legacy Mitsubishi Electric MELSEC-A AnS Series programmable-controller CPU module with an integrated power supply and five-slot main base unit. It supports an 8K-step sequence program, up to 256 I/O points, 2,048 device points, and 4K file-register points. Production ended on 30-09-1998.
Programming software
GX Developer
Software versions
Held in Command Centre, matched to firmware

Common questions about the A1SJCPU-S3

Is the Mitsubishi Electric A1SJCPU-S3 discontinued?

On ECS's lifecycle assessment, the A1SJCPU-S3 is discontinued and no longer supplied by Mitsubishi Electric.

Can I still buy a A1SJCPU-S3?

Not from Mitsubishi Electric. Surplus and refurbished sellers may have stock; check provenance and test before fitting.

How do I back up a A1SJCPU-S3?

It is programmed with GX Developer. 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 A1SJCPU-S3 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-AnS parts

All Mitsubishi Electric parts · All manufacturers