Allen Bradley 1756-OB16DK ControlLogix 16-Point Diagnostic Output Module

Product Overview

The Allen Bradley 1756-OB16DK provides high-reliability discrete control for the ControlLogix platform. This 16-point digital DC output module features advanced on-board diagnostics to detect and report field-side wiring faults. The "K" version indicates factory-applied conformal coating, providing an essential chemical and moisture barrier for hardware deployed in harsh industrial environments. We supply this module in 100% Brand New and Original condition, ensuring maximum system uptime for your critical control loops.

Technical Specifications

The 1756-OB16DK utilizes the following electrical and physical parameters:

Engineering Advantages

The 1756-OB16DK solves critical maintenance and reliability challenges in the field:

• Comprehensive Fault Detection: This module monitors each output point for "Open Wire" and "Short Circuit" conditions. By reporting these errors directly to the controller, it eliminates the need for manual circuit testing and reduces troubleshooting time from hours to seconds.

• Corrosive Environment Protection: The factory-applied conformal coating shields internal components from corrosive gases (such as H2S), high humidity, and airborne dust. This makes the 1756-OB16DK ideal for paper mills, wastewater facilities, and petrochemical plants.

• Electronic Fusing: The module incorporates electronic protection that reacts to overcurrent conditions. This prevents damage to the internal circuitry and the connected load, resetting automatically once the fault clears and the output toggles.

• High-Current Drive: Supporting up to 1 Amp per point, the 1756-OB16DK directly drives heavy industrial loads like large solenoid valves and motor starters without requiring interposing relays in many applications.

FAQs

• What is the difference between 1756-OB16D and 1756-OB16DK?

  The "K" version (1756-OB16DK) includes a conformal coating on the circuit board for extra protection against harsh environments. Functionally, they are identical and use the same configuration profile in Studio 5000.

• Does this module support "Sinking" loads?

  No. The 1756-OB16DK is a Sourcing module. It supplies the positive DC voltage from the module to the field device.

• Can I hot-swap this module during operation?

  Yes, the ControlLogix platform supports RIUP (Removal and Insertion Under Power). However, ensure you follow all safety protocols to prevent accidental process interruption or electrical arcing.

• Which Removable Terminal Block (RTB) should I use?

  You must use a 36-pin RTB, specifically the 1756-TBCH (Cage Clamp) or 1756-TBS6H (Spring Clamp). These are sold separately and do not come with the module.