1756-OB16D | Allen-Bradley ControlLogix 16-Point 24V DC Diagnostic Output Module

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

• Model / Catalog Number: 1756-OB16D

• Brand: Allen-Bradley

• Manufacturer: Rockwell Automation

• Product Line: ControlLogix

• Product Type: Diagnostic DC Output Module

• Number of Outputs: 16 individually monitored channels

• Output Type: DC Source (Sourcing)

• Nominal Voltage: 24V DC

• Operating Voltage Range: 19.2–30V DC

• Maximum Output Current (per point): 2 A @ 30°C (86°F)

• Maximum Output Current (per module): 8 A @ 30°C, 4 A @ 60°C

• Power Dissipation (max): 3.3 W @ 60°C (140°F)

• Backplane Current:

• 5V DC: 250 mA

• 24V DC: 140 mA

• Isolation Voltage: 50V continuous (basic insulation, output-to-backplane)

• Diagnostic Functions: Output verification, fault-state monitoring, open-load detection, short-circuit sensing

• Compatible Terminal Blocks: 1756-TBCH, 1756-TBS6H (removable)

• Enclosure Type: Open-style (ControlLogix chassis installation)

• Weight: 0.56 lbs (0.26 kg)

• Operating Temperature: 0°C to +60°C (32°F to +140°F)

• Storage Temperature: -40°C to +85°C (-40°F to +185°F)

• Humidity: 5–95% non-condensing

• Vibration: 10–500 Hz @ 2 g peak

• Shock: 30 g operating, 50 g non-operating

Key Features

• Built-in output diagnostics for predictive maintenance and rapid fault identification

• 16 high-density sourcing outputs with configurable status reporting

• Supports real-time output verification and no-load detection

• Compact design for ControlLogix chassis with minimal power consumption

• Wide voltage tolerance for use in diverse DC control applications

Applications

• Motor and actuator control in factory automation systems

• Machine safety and motion applications requiring diagnostic feedback

• Real-time monitoring and control in distributed I/O environments

• 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.