AB 1771-A4B
AB 1771-A4B
AB 1771-A4B
AB 1771-A4B
AB 1771-A4B
AB 1771-A4B
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1771-A4B

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Allen-Bradley 1771-A4B is a 16-slot Series B I/O chassis for 1771 I/O and PLC-5 architectures. The chassis backplane provides the communication path between installed modules and the processor or I/O adapter.
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Technical specifications for 1771-A4B

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1771-A4B
  • Product Family:
    PLC-5
  • Product Type:
    Sixteen-slot Series B I/O chassis
  • Stock:
    1
  • Module slots:
    16
  • Mounting:
    Enclosure backpanel
  • Backplane role:
    Communication path between modules and processor or I/O adapter
  • Addressing:
    Depends on installed processor/adapter and configured 1771 I/O addressing mode
  • Dimensions:
    61.0 × 31.5 × 19.3 cm
  • Weight:
    6.7 kg
  • Tariff Code:
    8538900000
  • Country of origin:
    USA
  • 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 Slot Planning Power & Grounding Installation Checks Application
  • Sixteen-slot Series B chassis for 1771 I/O and PLC-5 systems
  • Backplane links installed modules with the processor or I/O adapter
  • Backpanel mounting with documented wiring and grounding clearances

The Allen-Bradley 1771-A4B is a sixteen-slot Series B I/O chassis for compatible PLC-5 and 1771 hardware.

Its backplane provides the communication path between the installed modules and the processor or remote-I/O adapter.

Confirm addressing mode, slot plan, power arrangement, module compatibility, grounding, enclosure clearance, and wiring depth before replacement.

Availability, condition, price, and shipping time for Allen-Bradley 1771-A4B PLC-5 16-slot chassis are confirmed during quotation.

Allen-Bradley 1771-A4B PLC-5 16-Slot I/O Chassis 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.

  • Map processor or adapter and I/O modules to the documented slots
  • Preserve one-slot, two-slot, or half-slot addressing requirements
  • Check module keying, wiring arms, current, and controller support
  • Select the approved power-supply arrangement for the installed chassis
  • Calculate total backplane current for every module
  • Bond the chassis and enclosure according to industrial grounding guidance
  • Allow extra depth for wiring arms, conductors, and connectors
  • Inspect backplane connectors, card guides, mounting holes, and corrosion
  • Record the Series B label and complete module inventory before service
  • PLC-5 machine and transfer-line control with centralized 1771 I/O
  • Material-handling and packaging systems retaining 1771 racks
  • Legacy process-control installations using local or remote 1771 I/O
Description
The Allen-Bradley 1771-A4B is a sixteen-slot Series B I/O chassis used with compatible 1771 I/O modules and PLC-5 processors or I/O adapters. It is mounted on the enclosure backpanel.

The official PLC-5 documentation shows overall chassis dimensions of 610 × 315 × 193 mm (W × H × D). The backplane carries communication between modules and the processor or adapter, while the selected power supply and module set determine the electrical loading.

Before replacement, verify the Series B label, slot addressing, processor or adapter position, power-supply arrangement, module compatibility, grounding, cabinet clearance, and wiring access. Official documents reviewed give conflicting approximate weights, so the dedicated weight field is left blank.
Revisions

Revision Part #

Also known as

1771-A4B Ser B
1771-A4B/B, Series B, Rev B
Alternative Names
Allen-Bradley 1771-A4B AB 1771-A4B Rockwell Automation 1771-A4B 1771 A4B 1771A48 PLC-5 16-Slot I/O Chassis 1771-A4B
Technical notes
Allen-Bradley 1771-A4B is a 16-slot Series B PLC-5 I/O chassis; confirm backplane power, slot addressing, grounding, enclosure clearance, and exact installed module compatibility.
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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.
How are the sixteen slots in Allen-Bradley 1771-A4B used?
The chassis accepts compatible 1771 modules, with a PLC-5 processor or I/O adapter occupying the position required by the chosen architecture. Build the slot list from the controller and I/O documentation, not from slot count alone.
Can any 1771 I/O module be installed in Allen-Bradley 1771-A4B?
No universal compatibility should be assumed. Check module voltage and current, backplane loading, chassis and adapter support, keying, addressing mode, wiring arm, hazardous-location approval, and controller firmware.
How does addressing mode affect an Allen-Bradley 1771-A4B installation?
One-slot, two-slot, and half-slot addressing change how physical slots map to I/O groups and can restrict module placement. Preserve the existing addressing scheme unless the program, adapter switches, and documentation are deliberately revised.
Is a power supply included with Allen-Bradley 1771-A4B?
Do not assume it is included. The chassis and compatible power-supply arrangement are separate supply items unless the stock description explicitly lists a power supply and associated cable or mounting hardware.
Can Allen-Bradley 1771-A4B directly replace 1771-A4?
Do not treat similar slot counts as proof of a direct replacement. Verify chassis series, dimensions, mounting, power connection, addressing, processor or adapter support, approvals, and every installed module before substitution.
Is migrating Allen-Bradley 1771-A4B to ControlLogix a direct chassis swap?
No. Rockwell offers 1771-to-1756 conversion mounting hardware, but migration still requires I/O conversion modules or rewiring, controller and network design, rack mapping, software changes, safety review, and commissioning.
Can the existing modules and wiring arms be transferred directly to another Allen-Bradley 1771-A4B?
Only after documenting the complete slot arrangement, addressing mode, module keying, wiring-arm assignments, power supply, and adapter settings. De-energize the system, transfer components systematically, inspect the replacement backplane, and complete controlled I/O testing before startup.

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