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  • Lifecycle status

    Discontinued / Obsolete by OEM
    Apter Power coordinates label checks, official documents, condition review, quotation, and sourcing for this discontinued controller.

1769-L23E-QB1B

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As a packaged CompactLogix controller, Allen-Bradley 1769-L23E-QB1B handles embedded 24 V DC discrete machine signals while bridging EtherNet/IP supervision and a supported RS-232 device path.
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Technical specifications for 1769-L23E-QB1B

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1769-L23E-QB1B
  • Product Family:
    CompactLogix
  • Product Type:
    CompactLogix 5370 Packaged Digital I/O Controller
  • Stock:
    1
  • User memory:
    512 KB
  • Embedded digital inputs:
    16 sinking/sourcing at 24 V DC
  • Embedded digital outputs:
    16 sourcing transistor
  • EtherNet/IP ports:
    1
  • Serial ports:
    1 RS-232
  • Maximum Compact I/O expansion:
    3 modules
  • Embedded power supply:
    24 V DC
  • 5 V bus current:
    1,000 mA maximum
  • Power consumption:
    7.01 W
  • Operating temperature:
    0...60 °C
  • Enclosure type:
    Open-style
  • Weight:
    0.91 kg
  • Estimated shipping dimensions:
    18.52x11.8x13.2cm
  • Tariff Code:
    8537101190
  • Country of origin:
    Malaysia
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Serial Path Expansion Power Project Recovery Product Applications

Features:

  • Packaged control: the processor, supply, and discrete field points share one controller assembly
  • Two communication roles: EtherNet/IP and RS-232 serve different parts of the installed architecture
  • Digital-only identity: the QB1B configuration remains distinct from the mixed-I/O QBFC1B catalog
1769-L23E-QB1B is easiest to recognize as an earlier packaged CompactLogix design built around local discrete machine signals.

Its serial interface can be as important as the Ethernet connection when maintenance depends on an established device protocol or cable.

The complete QB1B suffix should remain visible in every quotation because the related QBFC1B package carries a different embedded-channel configuration.

Apter Power can coordinate official-document review, quotation, and procurement support for 1769-L23E-QB1B.
Allen-Bradley 1769-L23E-QB1B CompactLogix 5370 Packaged Digital I/O Controller Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Interface role: use the embedded RS-232 channel only for the supported DF1 or ASCII arrangement.
  • Cable record: retain the approved connector, pinout, and device-side wiring reference.
  • Message definition: preserve baud, framing, addressing, and controller logic as one communication record.
  • Change boundary: introduce a gateway only when its protocol behavior is officially supported and functionally tested.
  • Module limit: the packaged controller supports no more than three following Compact I/O modules.
  • Bus demand: total the 5 V and 24 V requirements of every retained module before installation.
  • Module order: preserve the approved sequence and distance-rating requirements in the local bank.
  • Project match: keep catalog numbers and slot definitions aligned with the physical extension.
  • Application copy: retain the last approved project and the software version used to maintain it.
  • Controller record: capture series, firmware, operating mode, and current fault history.
  • Network identity: preserve the Ethernet address and connected-device paths outside the program file.
  • Restore proof: test a controlled download and representative I/O before a production outage.
  • Packaged discrete control: execute local logic with embedded 24 V DC input and sourcing-output channels.
  • EtherNet/IP data exchange: connect the controller to supported networked automation devices.
  • Serial equipment: maintain a documented DF1 or ASCII device path through the RS-232 interface.
  • Local I/O extension: add a limited Compact I/O bank when the published module and power boundaries are met.
Description
1769-L23E-QB1B combines a CompactLogix processor, an embedded power supply, and local 24 V DC discrete I/O in one packaged controller. This arrangement gives machine builders a self-contained control point without requiring a separate base controller and initial digital I/O bank.

The communication role of 1769-L23E-QB1B spans EtherNet/IP supervision and an RS-232 path for supported serial equipment. That combination is particularly relevant when a machine must preserve an established serial exchange while remaining visible to an Ethernet-based control system.

Rockwell Automation identifies 1769-L23E-QB1B as discontinued and names 1769-L24ER-QB1B as its replacement reference. The reference supports migration planning, but the installed project and cabinet design still determine whether modernization or like-for-like sourcing is the appropriate maintenance route.
Revisions

Revision Part #

Also known as

1769-L23E-QB1B Series A
1769-L23E-QB1B/A, Series A
1769-L23E-QB1B Series B
1769-L23E-QB1B/B, Series B
Alternative Names
Allen-Bradley 1769-L23E-QB1B controller Rockwell Automation 1769-L23E-QB1B AB 1769 L23E QB1B 1769L23EQB1B CompactLogix CompactLogix packaged digital controller 1769-L23E-QB1B 1769-L23E-QB1B 512 KB PLC
Technical notes
A grouped output loss on 1769-L23E-QB1B can be mistaken for controller failure because the sourcing circuits depend on correct 24 V DC field power and common wiring. Confirm field supply, common continuity, and connected-load current before exchanging hardware; stop if the terminal arrangement differs from the approved drawing.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why can a serial device remain silent after a project is restored to 1769-L23E-QB1B?
Compare the restored channel mode, baud, framing, address, message logic, cable pinout, and device state with the last proven communication record before changing hardware.
What should an engineer inspect when 1769-L23E-QB1B appears online but remote devices cannot exchange data?
Check the controller IP settings, subnet, switch link, produced or consumed connections, message paths, and project ownership, then stop if the network design differs from the approved backup.
How should a buyer distinguish 1769-L23E-QB1B from the similarly named mixed-I/O package?
Match the complete QB1B suffix and the required discrete-only embedded channel set; request the nameplate and project I/O map when a quotation omits the suffix.
What should be stored with a shutdown spare of 1769-L23E-QB1B?
Keep clear nameplate photographs, series and firmware records, the approved project, Ethernet and serial settings, I/O drawings, and a documented bench-test result with the spare.
When should work stop during a local I/O change beside 1769-L23E-QB1B?
Stop if the proposed bank exceeds three modules, lacks a verified bus-current calculation, breaks a distance rating, or does not match the project’s catalog sequence.
How can a maintenance team reduce startup risk after installing 1769-L23E-QB1B?
Restore the controlled project, prove controller mode and communications, test representative inputs and outputs without machine motion, and compare diagnostics with the recorded pre-outage baseline.