Product Details
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:
| Feature | Specification |
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Product Line | ControlLogix |
| Output Type | 16 Diagnostic Outputs (Sourcing) |
| Voltage Category | 12/24V DC |
| Operating Voltage Range | 10–31.2V DC |
| Output Current Rating | 1 A per point / 8 A per module (max @ 60°C) |
| Surge Current | 2 A for 10 ms per point |
| Backplane Current (5.1V) | 250 mA |
| Backplane Current (24V) | 2 mA |
| Protection | Conformal Coated (K-Suffix) |
| Removable Terminal Block | 1756-TBCH or 1756-TBS6H |
Engineering Advantages
The 1756-OB16DK solves critical maintenance and reliability challenges in the field:
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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.
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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.
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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.
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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
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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.
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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.
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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.
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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.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Mastering PLC Programming: Best Practices for Robust Industrial Automation
Writing clean PLC code requires discipline, especially regarding memory management. Avoid overusing SET and RESET instructions, as they often complicate debugging. If multiple rungs control the same bit, troubleshooting becomes a nightmare. Instead, focus on energizing a bit in only one location. If your logic requires complex conditions, use branches within a single rung. This approach keeps your code readable, maintainable, and significantly easier to audit during downtime.
PLC vs. HMI: Distinguishing the Brain from the Interface in Industrial Automation
In the realm of industrial automation, distinguishing between a Programmable Logic Controller (PLC) and a Human-Machine Interface (HMI) is fundamental. While both devices work in tandem, they serve distinct purposes. The PLC acts as the "brain" of the operation, executing logic, whereas the HMI serves as the "eyes," allowing operators to monitor and interact with the system. Understanding this synergy is essential for any professional designing robust factory automation solutions.
Selecting the Right Industrial Automation Solution for Modern Manufacturing
Choosing an effective industrial automation system starts with a thorough process audit. You must identify tasks that are repetitive, labor-intensive, or prone to human error. Not every process requires high-level automation; therefore, prioritize operations that directly impact throughput and quality. By scoping your needs accurately, you avoid over-investing in unnecessary technology. A balanced approach ensures that your capital expenditure aligns with measurable gains in operational efficiency.