SKU: 1771-OZL

Allen-Bradley 1771-OZL PLC-5 Digital Relay Contact Output Module

The Allen-Bradley 1771-OZL is an 8-point Digital Contact Output Module for the PLC-5 system. Utilizing hermetically sealed dry-reed relays, it provides eight Form A normally open contacts organized into four isolated groups. Rated for 0-24V AC/DC at 100mA, this module ensures high-speed switching and superior signal isolation for sensitive low-power industrial applications.

Product Overview

The Allen-Bradley 1771-OZL acts as a specialized digital output solution within the legendary PLC-5 Universal I/O platform. By leveraging high-performance dry-reed relay technology, this module provides a reliable interface between programmable controllers and low-power field devices. It features eight independent Form A (normally open) contact outputs, which the hardware organizes into four distinct isolated groups. This isolated architecture enables engineers to utilize multiple voltage sources across a single module, significantly enhancing wiring flexibility in complex control systems.

Operational Performance and Durability

Furthermore, the 1771-OZL distinguishes itself through the use of hermetically sealed relays. These sealed components actively protect the switching contacts from corrosive gases, moisture, and airborne contaminants typical of industrial environments. Consequently, the module maintains superior signal integrity and high-speed switching performance over an extended service life. Additionally, front-panel status indicators provide immediate visual confirmation for each output point, which allows maintenance personnel to verify relay states and troubleshoot field wiring at a glance.

Technical Versatility and Application

In addition to its rugged physical construction, this module excels in precision low-voltage applications. Because it operates within a range of 0 to 24V AC/DC and supports a maximum current of 100 mA per point, it provides the ideal electrical characteristics for interfacing with sensitive instrumentation or high-impedance loads. Moreover, the inherent electrical isolation of the dry-reed design ensures that electrical noise from the field does not interfere with the PLC backplane. Ultimately, the 1771-OZL remains a critical component for specialized switching tasks where traditional triac or transistor outputs are unsuitable due to leakage current or voltage drop requirements.

Technical Specifications

Manufacturer: Allen-Bradley / Rockwell Automation
Model Designation: 1771-OZL
Module Type: Digital Relay Contact Output
Relay Technology: Hermetically Sealed Dry-Reed
Number of Outputs: 8 Normally Open (Form A)
Output Isolation: 4 Isolated groups (2 points per group)
Voltage Range: 0–24V AC or 0–24V DC
Maximum Current per Point: 100 mA
Switching Frequency: High-speed capability compared to standard electromechanical relays
Visual Diagnostics: 8 Red Status LEDs
System Compatibility: PLC-5 Universal I/O Chassis
Physical Weight: 0.9 kg