Product Details
Overview
The Allen-Bradley 1756-OB16D is a high-performance diagnostic DC output module from the ControlLogix family. Designed to provide precise control and advanced diagnostics for 24V DC sourcing outputs, this module supports up to 16 output points with detailed fault detection capabilities. It enhances system reliability by monitoring conditions such as no-load, output verification, and fault-state behavior, making it an essential component in modern industrial automation systems.
Technical Specifications
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Model / Catalog Number: 1756-OB16D
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Brand: Allen-Bradley
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Manufacturer: Rockwell Automation
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Product Line: ControlLogix
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Product Type: Diagnostic DC Output Module
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Number of Outputs: 16 individually monitored channels
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Output Type: DC Source (Sourcing)
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Nominal Voltage: 24V DC
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Operating Voltage Range: 19.2–30V DC
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Maximum Output Current (per point): 2 A @ 30°C (86°F)
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Maximum Output Current (per module): 8 A @ 30°C, 4 A @ 60°C
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Power Dissipation (max): 3.3 W @ 60°C (140°F)
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Backplane Current:
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5V DC: 250 mA
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24V DC: 140 mA
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Isolation Voltage: 50V continuous (basic insulation, output-to-backplane)
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Diagnostic Functions: Output verification, fault-state monitoring, open-load detection, short-circuit sensing
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Compatible Terminal Blocks: 1756-TBCH, 1756-TBS6H (removable)
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Enclosure Type: Open-style (ControlLogix chassis installation)
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Weight: 0.56 lbs (0.26 kg)
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Operating Temperature: 0°C to +60°C (32°F to +140°F)
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Storage Temperature: -40°C to +85°C (-40°F to +185°F)
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Humidity: 5–95% non-condensing
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Vibration: 10–500 Hz @ 2 g peak
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Shock: 30 g operating, 50 g non-operating
Key Features
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Built-in output diagnostics for predictive maintenance and rapid fault identification
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16 high-density sourcing outputs with configurable status reporting
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Supports real-time output verification and no-load detection
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Compact design for ControlLogix chassis with minimal power consumption
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Wide voltage tolerance for use in diverse DC control applications
Applications
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Motor and actuator control in factory automation systems
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Machine safety and motion applications requiring diagnostic feedback
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Real-time monitoring and control in distributed I/O environments
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Energy-efficient industrial systems with advanced fault tracking
FAQs
Q1: What makes the 1756-OB16D different from standard output modules?
Unlike standard DC output modules, the 1756-OB16D includes diagnostics for detecting open circuits, output verification, and short-circuit conditions, providing detailed system health data.
Q2: Which terminal blocks are compatible with this module?
It supports both 1756-TBCH (cage clamp) and 1756-TBS6H (spring clamp) terminal blocks.
Q3: Can the 1756-OB16D be used in high-temperature control cabinets?
Yes. It performs reliably up to 60°C (140°F), making it suitable for industrial control environments.
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 Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.
Understanding Marshalling Cabinets in Industrial Automation and Control Systems
Marshalling cabinets serve as the crucial connection hub between field instruments and centralized processing units. In large DCS and PLC control system architectures, hundreds of multipair field cables run from local junction boxes to the central instrument equipment room. The marshalling cabinet houses field terminal blocks, surge arresters, intrinsic safety isolation barriers, and interposing relays. By segregating field field-wiring terminations from sensitive processor hardware, engineers protect expensive controller backplanes from high-voltage transients. Consequently, this modular separation dramatically streamlines maintenance workflows and simplifies system expansion.
Essential Best Practices for PLC Wiring and Installation in Industrial Automation
Successful control system deployment begins with thoroughly reviewing manufacturer technical documentation. Controllers from major brands like Allen-Bradley, Siemens, and Schneider Electric feature unique terminal layouts. Engineers must verify voltage requirements before connecting power cables to prevent catastrophic equipment damage. Standard line connections require strict adherence to regional electrical codes and proper wire color coding. Furthermore, panel builders should always establish a robust low-impedance ground connection using at least 16-AWG copper conductor tied directly to the main plant grounding grid.