Allen-Bradley 1756-OF8 ControlLogix 8-Point Analog Output Module

Allen-Bradley 1756-OF8 ControlLogix 8-Point Analog Output Module

Price range: $614.73 through $996.03

The Allen-Bradley 1756-OF8 is an 8-point high-density analog output module providing ±10V voltage or 0-20mA current control signals for multiple modulating field devices. It converts digital controller values into continuous analog signals to drive variable frequency drives (VFDs), control valves, and positioners with high accuracy. Each channel offers programmable output ranges and customizable fault behavior to ensure safe process shutdown during network interruptions. Its compact single-slot design provides high-density analog control while supporting Removal and Insertion Under Power (RIUP) for streamlined maintenance.

$614.73
$912.33
$996.03
SKU: 1756-OF8 Category: Brand:

Description

  • Part Number: 1756-OF8
  • Manufacturer: Allen-Bradley
  • Type: 8-Point Analog Output Module
  • Series: ControlLogix 1756 Series
  • Application: Multi-Loop Analog Control & Actuator Driving
  • Size // Rating: 8 Output Channels, Voltage & Current Selectable
  • Connection Type: Removable Terminal Block (RTB) / Backplane
  • Compatibility: Allen-Bradley ControlLogix 1756 System

TCI is not an authorized Allen-Bradley distributor.

Documentation

No documentation is available for this product.

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Description

The Allen-Bradley 1756-OF8 is a high-density analog output module designed for the ControlLogix system platform, offering eight individually configurable output channels in a single rack slot. It bridges the gap between digital processing logic and continuous process machinery by translating numerical control data into precise voltage (±10V) or current (0–20 mA / 4–20 mA) signals.

Engineered for demanding process control loops, the 1756-OF8 delivers high-resolution 15-bit digital-to-analog signal conversion for precise modulation of field equipment such as motor drives, proportional control valves, and industrial heating controls. Control engineers can customize each output channel via Studio 5000 or RSLogix 5000 software to specify operational limits, digital scaling parameters, and fail-safe states (such as Hold Last State or Go to Fault Value) in the event of controller loss or communication disruption.

The module mounts securely in any open ControlLogix chassis slot and utilizes a 20-pin Removable Terminal Block (1756-TBNH or 1756-TBSH) for easy field wiring termination. Featuring full Removal and Insertion Under Power (RIUP) capability, the 1756-OF8 allows technicians to perform hot-swaps or hardware replacements without shutting down chassis backplane power or interrupting adjacent I/O modules.

Frequently Asked Questions

What is the primary function of the Allen-Bradley 1756-OF8 module?

The 1756-OF8 converts digital control values from a ControlLogix processor into continuous analog voltage or current signals to control proportional field devices.

What output signal ranges does the 1756-OF8 support?

It supports software-configurable ranges including ±10V DC voltage and 0–20 mA or 4–20 mA DC current signals.

What digital resolution does the 1756-OF8 offer?

The module features 15-bit digital-to-analog conversion resolution across its operating ranges.

Which Removable Terminal Block (RTB) is required for the 1756-OF8?

It requires a 20-pin RTB, such as the 1756-TBNH (NEMA screw clamp) or 1756-TBSH (spring clamp).

Can output channels be configured with fail-safe values?

Yes. Programmers can configure each channel's response to controller communication loss or fault states, choosing options like Hold Last State or transitioning to a predefined safe output value.

What is the difference between the 1756-OF8 and the 1756-OF8I?

The standard 1756-OF8 features non-isolated channels (group common), whereas the 1756-OF8I provides individual channel-to-channel isolation for noisy electrical environments or distinct ground potentials.

Does the 1756-OF8 support Removal and Insertion Under Power (RIUP)?

Yes. The 1756-OF8 can be inserted or removed from an active ControlLogix chassis without interrupting system power or adjacent modules.

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