1769-OB32 Allen-Bradley 24V DC 32-Point Discrete Output Module

Product Overview

The Allen-Bradley 1769-OB32 is a high-density digital output module engineered for the CompactLogix and MicroLogix 1500 systems. This module features 32 discrete sourcing outputs, allowing controllers to interface with a wide variety of DC-powered field devices. Designed for precision and reliability, the 1769-OB32 facilitates high-speed switching and efficient power distribution across two isolated groups. Manufactured by Rockwell Automation, it provides a robust and scalable solution for industrial applications requiring extensive I/O capacity within a compact mechanical footprint.

Core Technical Advantages

High-Density 32-Point Configuration

By integrating 32 output points into a single 1769 series module, the 1769-OB32 significantly reduces the cabinet space required for I/O expansion. This high-density design is ideal for complex control systems where panel real estate is at a premium, without compromising on switching performance or electrical isolation.

Efficient Thermal and Power Management

The module supports a continuous current of 1.0 A per output (at 30°C), with a total capacity of 8.0 A per common group. With a maximum on-state voltage drop of only 1.0V DC at 0.1 A, it ensures minimal heat generation and maximum energy efficiency during continuous operation in demanding industrial environments.

Superior Signal Integrity

Featuring an off-state leakage current of just 1.0 mA at 26.4V DC, the 1769-OB32 prevents "ghost" signals or false activation of sensitive loads. Its solid-state design provides faster response times and a longer operational life compared to traditional relay-based output modules.

Technical Specifications

Installation & Safety Guidelines

• Power Supply: Ensure that the external 24V DC power supply is properly fused to protect both the module and the field devices.
• Thermal Derating: Note that the continuous current capacity decreases as ambient temperature increases. For operation above 30°C, refer to the official Rockwell derating curves.
• Bus Expansion: When calculating the system power budget, account for the current draw on the 1769 bus to ensure the controller or power supply can support the additional module.

Technical FAQs

Q1: What is the difference between a sourcing and a sinking output?

A1: The 1769-OB32 is a sourcing module, meaning it provides the positive voltage (+V) to the load, while the common side of the load is connected to the negative return.

Q2: Can I mix different voltages on the two groups?

A2: Yes, the two groups are electrically isolated from each other, allowing you to use separate 24V DC power sources if required for specific system isolation needs.

Q3: Is the module hot-swappable?

A3: No, the 1769 Compact I/O system does not support "Removal and Insertion Under Power" (RIUP). Always disconnect system power before adding or removing modules to prevent damage.