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1756-OA8D

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Allen-Bradley 1756-OA8D is an eight-point ControlLogix diagnostic AC output module for compatible 74–132 V AC field-load control.
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Technical specifications for 1756-OA8D

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-OA8D
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 8-Point Diagnostic AC Digital Output Module
  • Stock:
    1
  • Output type:
    diagnostic AC digital output
  • Output points:
    8
  • Operating voltage:
    74–132 V AC
  • Output groups:
    two groups of four
  • Group isolation:
    125 V continuous between output groups
  • Compatible RTB:
    1756-TBNH or 1756-TBSH
  • Diagnostics:
    absent wiring, missing load, and field-power loss; diagnostic latching is configured in the controller project
  • Dimensions:
    3.46 × 14.43 × 14.69 cm
  • Tariff Code:
    8473309000
  • 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 Diagnostics Terminal Blocks Output Groups Application
  • Controls eight compatible 74–132 V AC field-load circuits
  • Supports configured diagnostics for wiring, load, and field-power conditions
  • Uses documented 1756-TBNH or 1756-TBSH terminal-block hardware

1756-OA8D is an Allen-Bradley ControlLogix eight-point diagnostic AC output module.

Its diagnostic behavior makes field-circuit design and fault-latching choices part of the controller application, not merely an output wiring task.

Confirm the RTB, grouped field supplies, output loads, diagnostic configuration, and Series A identity before operation.

Availability, condition, price, and shipping time for 1756-OA8D are confirmed during quotation.

Allen-Bradley 1756-OA8D ControlLogix Diagnostic AC Output Module 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.

  • Configure absent-wiring and missing-load diagnostics for the machine response
  • Review field-power-loss handling before setting diagnostic latch behavior
  • Investigate the physical field circuit before clearing a recurring diagnostic
  • Use only the documented 1756-TBNH or 1756-TBSH RTB arrangement
  • Check RTB seating and field terminations after replacement
  • Preserve the panel drawing identification for every output circuit
  • Review the separate output-group field supplies during troubleshooting
  • Keep AC load duty within the documented operating role
  • Verify the controller output map before energizing field devices
  • ControlLogix AC output circuits requiring field-load diagnostics
  • Industrial control panels that monitor output load and wiring conditions
  • Eight-point AC field-control sections using grouped output supplies
Description
1756-OA8D is an Allen-Bradley ControlLogix eight-point diagnostic AC digital output module for compatible field-load control.

The module switches 74–132 V AC loads and provides diagnostic configuration for conditions such as absent wiring, missing load, and field-power loss.

Before replacement, confirm the 1756-TBNH or 1756-TBSH terminal block, load wiring, diagnostic policy, controller project, and Series A identity.
Revisions

Revision Part #

Also known as

1756-OA8D Ser A
1756-OA8D/A, Series A, Rev A
Alternative Names
1756-OA8D 1756 OA8D 1756OA8D Allen-Bradley 1756-OA8D Rockwell Automation 1756-OA8D ControlLogix 1756-OA8D
Technical notes
1756-OA8D Series A uses compatible 1756-TBNH or 1756-TBSH terminal blocks; align its diagnostic policy with the actual AC load, field power, and recovery procedure.
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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.
Can 1756-OA8D be used with 240 V AC field loads?
No. 1756-OA8D is specified for 74–132 V AC output operation. Select hardware that directly matches the actual field-load voltage.
Why can 1756-OA8D report missing load after a replacement even though the output is commanded on?
Check the field wiring, external load, supply path, RTB seating, and the configured diagnostic/latching behavior before clearing the fault.
Can 1756-OA8D use any ControlLogix removable terminal block?
No. Use the documented 1756-TBNH or 1756-TBSH terminal-block arrangement and verify the installed field-wiring hardware.
What should be reviewed before enabling diagnostic latching on 1756-OA8D?
Review the machine response to absent-wiring, missing-load, and field-power-loss conditions so a diagnostic latch is compatible with the operating and recovery procedure.
Why does 1756-OA8D show a field-power-loss diagnostic only on part of the module?
The outputs are grouped. Inspect the supply and wiring serving the affected output group, then compare it with the controller diagnostic configuration.
Can 1756-OA8D replace a standard eight-point AC output module without project changes?
No. Its diagnostic behavior and terminal hardware must be matched to the existing load circuits and controller configuration.
How should 1756-OA8D outputs be returned to service after field wiring work?
Check the required terminal block, group supply, connected loads, diagnostic policy, and safe output state before restoring automatic control.