1756-OF8H ControlLogix HART Analog Output Module | Allen Bradley

Product Overview

The Allen Bradley 1756-OF8H serves as a high-performance HART (Highway Addressable Remote Transducer) analog output module within the ControlLogix ecosystem. This module provides eight high-density differential channels to drive final control elements such as valves and actuators. It bridges the gap between digital control strategies and analog field devices, offering simultaneous communication of digital HART data alongside the 4-20mA analog signal.

Technical Specifications

Engineering Advantages

• Superior Signal Integrity: The 1756-OF8H utilizes an R-Ladder DAC conversion method. This architecture ensures monotonicity with no missing codes, providing smooth, linear control for sensitive modulation tasks.

• HART Connectivity: This module eliminates the need for separate HART external hardware. It allows engineers to query device assets, monitor secondary variables, and perform remote calibration directly through the ControlLogix backplane.

• Robust Circuit Protection: The module includes overvoltage protection up to +/- 24V DC. This safeguard prevents internal component failure during accidental miswiring or field-side power surges.

• Precision Processing: With 16-bit resolution, the 1756-OF8H delivers granular control. It translates complex IEEE 32-bit floating-point data into precise physical movements, optimizing the efficiency of PID control loops.

FAQs

• Does this 1756-OF8H module arrive in original packaging?

  Yes. We supply this unit as 100% Brand New in the original factory-sealed Allen Bradley packaging to ensure maximum reliability and authenticity for your critical infrastructure.

• Which Removable Terminal Blocks (RTB) should I use for installation?

  The module requires either the 1756-TBCH (Cage clamp) or 1756-TBSH (Spring clamp). You must order these separately as they do not ship with the base module.

• Does the module support open-circuit detection?

  Yes, but only for current output modes. To trigger an open-circuit detection alert, you must set the output to a value less than 0.1 mA.

• Can I use this module for voltage-based actuators?

  Absolutely. While optimized for 4-20mA HART loops, the 1756-OF8H also supports +/- 10VDC signals, providing flexibility for various industrial drive interfaces.