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1756-OF8

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Allen-Bradley 1756-OF8 is an eight-channel nonisolated ControlLogix analog output module for ±10 V and 0...20 mA signals.
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Technical specifications for 1756-OF8

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-OF8
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 8-Channel Analog Output Module
  • Stock:
    1
  • Output channels:
    8 voltage or current
  • Voltage range:
    ±10 V
  • Current range:
    0...20 mA
  • Resolution:
    15 bit voltage; 16 bit current
  • Drive capability:
    Voltage load above 2000 Ω; current load 0...750 Ω
  • Open-circuit detection:
    Current output above 0.1 mA
  • Short-circuit protection:
    Electronically limited to 21 mA or less
  • Isolation:
    250 V outputs-to-backplane; no channel-to-channel isolation
  • Data formats:
    Integer and IEEE 32-bit floating point
  • Removable terminal block:
    1756-TBNH or 1756-TBSH
  • Weight:
    0.2 kg
  • Estimated shipping dimensions:
    3.5x14.3x14.5cm
  • Tariff Code:
    Please confirm the destination before shipping
  • 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 Shared Returns Load & Faults Chassis Thermal Product Applications

Features:

  • Eight analog outputs: each channel can provide the documented current or voltage signal
  • Shared output domain: backplane isolation is provided without channel-to-channel isolation
  • Current fault handling: open-circuit detection and electronic limiting support loop diagnostics
1756-OF8 is suited to actuator and setpoint circuits whose eight outputs can share the documented nonisolated electrical domain.

Current and voltage modes have different load and diagnostic behavior, so each channel record must include both its range and connected device.

The release baseline should preserve returns, shielding, scaling, fault-state values, RTB identity, chassis series, and a loaded output test.

Availability of 1756-OF8 is subject to Apter Power inventory and sourcing confirmation.
Allen-Bradley 1756-OF8 ControlLogix 8-Channel Analog 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.
  • Return network: account for the internally connected RTN terminals.
  • Load reference: compare actuator commons before combining channels.
  • Shield path: retain the cabinet grounding method for every analog cable.
  • External isolation: add it where the wider system requires separate potentials.
  • Current loop: keep total resistance within the documented 0...750 Ω capability.
  • Voltage load: use a load above the published minimum resistance.
  • Open circuit: test the current-output diagnostic above its stated activation level.
  • Current limit: verify fault handling without using a short as a routine calibration method.
  • Series C chassis: evaluate operation through the documented 60 °C limit.
  • Series B chassis: apply the lower 55 °C operating limit.
  • Power: include module backplane demand and dissipation in the enclosure calculation.
  • Release: measure outputs after the cabinet reaches a representative operating temperature.
  • Analog setpoints: send current or voltage references to compatible field devices.
  • Process actuation: command valves, drives, or converters that accept the documented signals.
  • Machine control: provide eight controller-generated analog outputs from one chassis slot.
Description
1756-OF8 provides eight configurable analog outputs for ±10 V or 0...20 mA control signals. Integer and IEEE 32-bit floating-point formats are available for controller data.

The eight channels of 1756-OF8 are isolated from the backplane but not from one another, and all return terminals are internally connected. Load reference, shield path, output mode, and the 20-position RTB must therefore be planned as a shared analog-output system.

Current-output open-circuit detection, electronic current limiting, load capability, scaling, and chassis thermal limits form the acceptance baseline for 1756-OF8. These checks should be performed with the real actuator circuit or an approved load simulator.
Revisions

Revision Part #

Also known as

1756-OF8 Series C
1756-OF8/C, Series C
Alternative Names
Allen-Bradley 1756-OF8 analog output Rockwell Automation 1756-OF8 AB 1756 OF8 1756OF8 current voltage output ControlLogix eight-channel analog output 1756-OF8 1756-OF8 Series C modulenei'r
Technical notes
The defining installation boundary for 1756-OF8 is its shared nonisolated output domain. Review common returns, load references, channel mode, current-loop continuity, scaling, fault-state behavior, RTB, and chassis-series temperature limits.
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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 one connected load disturb another channel on 1756-OF8?
The outputs do not have channel-to-channel isolation and share internally connected returns, so ground potential or an incorrect load reference can create interaction.
How should current-loop resistance be checked for 1756-OF8?
Measure the complete loop including device input and cable resistance, keep it within the published capability, then command several values and compare actual current.
What does open-circuit detection on 1756-OF8 monitor?
It applies to a current output driven above the documented threshold. Confirm the configured mode, command value, wiring continuity, and controller diagnostic before replacing the module.
Why does chassis series matter to the operating temperature of 1756-OF8?
Rockwell publishes a higher limit for Series C chassis than Series B, so enclosure qualification must use the actual chassis identity and module heat load.
Which RTB choices fit 1756-OF8?
Use the 20-position 1756-TBNH or 1756-TBSH, preserving the current and voltage terminal assignments, common returns, shield ground, and mechanical keying.
What should a loaded acceptance test for 1756-OF8 include?
Verify every channel in its configured mode at several commands, compare measured and controller values, test diagnostic behavior, and observe interaction across shared returns.

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