AB 1756-OX8I
AB 1756-OX8I
AB 1756-OX8I
AB 1756-OX8I
AB 1756-OX8I
AB 1756-OX8I
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1756-OX8I

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Allen-Bradley 1756-OX8I is an eight-point isolated ControlLogix relay output module for compatible AC or DC field-load switching.
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Technical specifications for 1756-OX8I

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-OX8I
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 8-Point Isolated Digital Relay Output Module
  • Stock:
    1
  • Output type:
    isolated relay output, normally open/normally closed
  • Output points:
    8
  • Operating circuits:
    5–125 V DC or 10–240 V AC
  • DC contact ratings:
    1 A at 5–30 V DC; 0.5 A at 48 V DC; 0.22 A at 125 V DC
  • AC contact ratings:
    1.5 A at 120 V AC; 0.75 A at 240 V AC
  • Output isolation:
    250 V continuous between outputs
  • Maximum output delay:
    13 ms
  • Dimensions:
    3.46 × 14.43 × 14.69
  • Tariff Code:
    8504901900
  • 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 Contact Duty Inductive Loads Output Mapping Application
  • Provides eight isolated relay outputs with normally open/normally closed contacts
  • Supports documented AC or DC field-load switching duties
  • Requires contact-load, suppression, wiring, and protection review

1756-OX8I is an Allen-Bradley ControlLogix eight-point isolated digital relay output module.

The relay contact arrangement supports compatible AC or DC field circuits, subject to the documented circuit-specific contact ratings.

Confirm the load type, contact duty, field wiring, terminal hardware, output map, and Series A identity before use.

Availability, condition, price, and shipping time for 1756-OX8I are confirmed during quotation.

Allen-Bradley 1756-OX8I ControlLogix Isolated Relay Output Module Manuals, Product Family, 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.

  • Match the connected AC or DC circuit to its documented relay-contact rating
  • Allow for the actual load type, inrush, and switching duty
  • Do not substitute relay behavior for a fast electronic-output requirement
  • Apply the documented panel suppression approach for inductive circuits
  • Inspect contacts after a field-load fault or abnormal inrush event
  • Verify protective devices match the connected circuit, not only the module
  • Preserve the accepted controller output map and panel terminal records
  • Confirm RTB keying and terminal seating after exchange
  • Prove each output in a guarded machine condition before automatic operation
  • ControlLogix discrete AC field-load switching
  • ControlLogix discrete DC field-load switching within documented relay ratings
  • Isolated relay-output sections of compatible industrial control panels
Description
1756-OX8I is an Allen-Bradley ControlLogix eight-point individually isolated relay output module with normally open and normally closed contacts.

Its relay contacts support documented AC and DC switching duties from 10–240 V AC and 5–125 V DC, subject to the applicable current rating, inrush, and switching delay.

Before installation, verify Series A identity, contact duty, inductive-load suppression, external protection, removable terminal block, controller output mapping, and required switching speed.
Revisions

Revision Part #

Also known as

1756-OX8I Ser A
1756-OX8I/A, Series A, Rev A
Alternative Names
1756-OX8I 1756 OX8I 1756OX8I Allen-Bradley 1756-OX8I Rockwell Automation 1756-OX8I ControlLogix 1756-OX8I
Technical notes
1756-OX8I Series A uses isolated relay contacts for documented AC or DC loads; verify the contact duty, suppression, protection, and field-circuit map before energizing.
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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-OX8I switch either AC or DC field circuits on the same module?
The relay outputs support documented AC or DC contact duties, but every circuit must remain within its applicable rating and be engineered with the correct protection and wiring.
Why can 1756-OX8I show a command while a connected load does not operate?
Check the individual relay contact path, external load supply, wiring, protection, contact rating, and output assignment. The controller command does not prove field power reaches the device.
Can 1756-OX8I replace a transistor-output module without field-circuit changes?
No. Relay contacts and transistor outputs have different electrical behavior, protection needs, and response characteristics. Review the complete load circuit first.
What must be checked before connecting an inductive device to 1756-OX8I?
Verify that the contact duty and suppression method suit the actual AC or DC inductive load, and follow the machine electrical design for protective components.
Why should 1756-OX8I unused relay points remain documented?
Unused points can still be assigned in a stored project or panel drawing. Preserve the documented output map to prevent later circuit misidentification.
Can 1756-OX8I be used where a fast electronic output response is required?
Confirm the required timing first. 1756-OX8I is a relay output module with a documented maximum output delay, so it should not be assumed to behave like a fast transistor output.
Why can an Allen-Bradley 1756-OX8I relay output become intermittent after repeated switching?
Check relay-contact wear and arcing, load current and inrush, switching frequency, inductive-load suppression, removable-terminal-block seating, field-power wiring, and loose conductors. A controller command does not confirm that the mechanical contact is closing reliably.