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Rockwell CompactLogix · Compact CPU

Rockwell 1769-L23E-QB1B

Normal sale of the 1769-L23E-QB1B 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 Rockwell 1769-L23E-QB1B discontinued?

On ECS's lifecycle assessment, the 1769-L23E-QB1B 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

1769-L23E-QB1B part details

Manufacturer
Rockwell Automation
Range
CompactLogix
Name
CMPLX 512KB Enet DI/O Controller
Summary
The Allen Bradley 1769-L23E-QB1B serves as a controller in the CompactLogix series, outfitted with capabilities for various communication protocols. It allows for connections via RS-232 and Ethernet, with provisions for a total of 16 inputs and 16 outputs.
Programming software
RS Logix 5000
Software versions
Held in Command Centre, matched to firmware

Common questions about the 1769-L23E-QB1B

Is the Rockwell 1769-L23E-QB1B discontinued?

On ECS's lifecycle assessment, the 1769-L23E-QB1B has been cancelled: no longer sold as a current product, though spares may remain available for a period.

Can I still buy a 1769-L23E-QB1B?

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 1769-L23E-QB1B?

It is programmed with RS Logix 5000. 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 1769-L23E-QB1B 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

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