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1769-L24ER-QB1B

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Embedded 24 V DC discrete control defines Allen-Bradley 1769-L24ER-QB1B, a packaged CompactLogix controller with switched EtherNet/IP connectivity and limited local expansion.
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Technical specifications for 1769-L24ER-QB1B

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1769-L24ER-QB1B
  • Product Family:
    CompactLogix
  • Product Type:
    CompactLogix 5370 Packaged Digital I/O Controller
  • Stock:
    1
  • User memory:
    750 KB
  • Embedded digital inputs:
    16 sinking/sourcing at 24 V DC
  • Embedded digital outputs:
    16 sourcing transistor
  • Maximum Compact I/O expansion:
    4 modules
  • Maximum EtherNet/IP nodes:
    8
  • Ethernet ports:
    2 embedded-switch ports
  • Programming port:
    USB
  • Embedded power supply:
    24 V DC
  • Removable storage:
    1784-SD1 or 1784-SD2
  • Power consumption:
    12 W
  • Operating temperature:
    0...60 °C
  • Weight:
    1.39 lbs (0.63 kg)
  • Estimated shipping dimensions:
    11.8x11.5x10.5cm
  • 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 Discrete Outputs I/O Expansion DLR Topology Product Applications

Features:

  • Packaged digital control: processor, supply, and local discrete channels share one assembly
  • Switched Ethernet: two connectors support linear or DLR cabling under one controller identity
  • Suffix-defined configuration: QB1B identifies the digital package rather than the mixed-I/O model
1769-L24ER-QB1B is intended for compact control tasks that can use its embedded 24 V DC discrete channels as the local signal foundation.

The dual connectors simplify an approved network path but do not provide the Dual-IP behavior used by other controller families.

The quotation should preserve the full suffix and the installed local-I/O context so a visually similar packaged controller is not treated as equivalent.

Apter Power offers official-document review, quotation coordination, and procurement support for 1769-L24ER-QB1B.
Allen-Bradley 1769-L24ER-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.
  • Field power: retain the approved 24 V DC supply and common arrangement for each output group.
  • Load demand: compare connected devices with per-point and group current boundaries.
  • Safe state: document the intended machine response when controller or field power is removed.
  • Fault isolation: separate logic, common, supply, wiring, and load faults before replacing the controller.
  • Module count: keep the following Compact I/O bank within the published four-module limit.
  • Bus current: total 5 V and 24 V demand for the exact catalog sequence.
  • Distance rating: preserve module order and any required supply placement.
  • Project match: align physical catalogs, slot definitions, firmware profiles, and terminals.
  • Port behavior: use the two connectors as the documented switched Ethernet interface.
  • Ring role: define the approved DLR supervisor and device order when a resilient ring is used.
  • Address control: retain one controller IP identity and prevent duplicate addressing.
  • Recovery test: verify permitted cable-fault behavior before production release.
  • Packaged discrete control: execute machine logic with embedded 24 V DC inputs and sourcing outputs.
  • Local Compact I/O systems: add approved specialty modules within the four-module boundary.
  • Linear EtherNet/IP systems: connect supported devices through the embedded switch.
  • Device Level Ring systems: participate in a documented resilient Ethernet topology.
Description
A packaged processor, power supply, and embedded discrete I/O make 1769-L24ER-QB1B a self-contained CompactLogix 5370 control point. The controller adds a larger application allocation and a newer switched-Ethernet architecture than the earlier L23E digital package.

The two Ethernet connectors on 1769-L24ER-QB1B belong to an embedded switch for linear or Device Level Ring layouts. USB programming and removable storage support project maintenance without changing the controller’s role as a single addressed network device.

1769-L24ER-QB1B is most suitable where its embedded discrete channels and limited Compact I/O extension match the machine design. The complete QB1B suffix remains essential because the related QBFC1B catalog serves a different mixed-signal requirement.
Revisions

Revision Part #

Also known as

1769-L24ER-QB1B Series A
1769-L24ER-QB1B/A, Series A
Alternative Names
Allen-Bradley 1769-L24ER-QB1B controller Rockwell Automation 1769-L24ER-QB1B AB 1769 L24ER QB1B 1769L24ERQB1B CompactLogix CompactLogix packaged digital controller 1769-L24ER-QB1B 1769-L24ER-QB1B 750 KB PLC
Technical notes
The two Ethernet connectors on 1769-L24ER-QB1B are embedded-switch ports, not independent controller interfaces. Select linear or DLR topology, preserve the single controller address, and verify ring supervision plus documented recovery behavior during a controlled test; stop if the proposed design requires two separately addressed networks.
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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 should the Ethernet ports on 1769-L24ER-QB1B not receive separate controller addresses?
They belong to one embedded switch interface. Configure one controller identity and the approved linear or DLR topology instead of treating the connectors as independent networks.
What can cause several outputs on 1769-L24ER-QB1B to fail at the same time?
Check grouped field power, common continuity, protective devices, output loading, terminal wiring, controller mode, and logic before assuming multiple electronic channel failures.
How should a technician respond when a new local module beside 1769-L24ER-QB1B is not recognized?
Verify the four-module boundary, catalog sequence, bus current, distance rating, module profile, electronic keying, connector seating, and the project’s physical slot definition.
Can 1769-L24ER-QB1B be replaced by the similarly named QBFC1B package without project changes?
Do not assume equivalence. QBFC1B includes mixed analog and counter resources, so compare embedded I/O, terminals, project logic, power, network, and official migration support.
What recovery assets should be stored with 1769-L24ER-QB1B?
Keep the approved project, firmware and software versions, IP and DLR records, I/O drawings, bus-power calculation, SD procedure, and a controlled bench-test report.
When should startup testing stop after installing 1769-L24ER-QB1B?
Stop if the catalog or firmware mismatches, the Ethernet topology is unstable, the local bank faults, field commons are unproven, or representative I/O differs from the approved baseline.