Allen-Bradley 1762-OW8 MicroLogix 8-Channel Relay Output

Product Introduction

The 1762-OW8 output module from Allen-Bradley is a solid-state, relay-type expansion unit for the MicroLogix 1100, 1200, and 1400 programmable logic controllers. This module adds eight normally open relay outputs to your control system. It excels at switching a wide range of industrial loads, from contactors and solenoids to pilot lights and alarms. Additionally, the 1762-OW8 supports both DIN rail and panel mounting, giving you great flexibility for various installation layouts.

Technical Specifications

The 1762-OW8 contains eight independent relay output channels organized into two isolated groups. Group 0 includes Outputs 0 through 3, while Group 1 covers Outputs 4 through 7. This module operates across an impressively wide voltage range, from 5 to 265V AC and 5 to 125V DC. Consequently, it handles both AC and DC loads with remarkable ease. Each output point supports a maximum continuous current of 2.5 Amps. Meanwhile, the continuous current rating reaches 8A per common and 16A for the entire module. A key performance feature is its consistent signal delay time of 10 ms for both ON-to-OFF and OFF-to-ON transitions, which ensures predictable operation in time-sensitive control loops.

For relay contact ratings, the 1762-OW8 handles 120/240V AC at 2.5A, 125V DC at 2A, and 24V DC at 1A. The maximum controlled load reaches 1440 VA, and the module dissipates only 2.9 Watts of heat. Regarding power consumption, it draws a maximum bus current of 80 mA at 5V DC (0.40 Watts) and 90 mA at 24V DC (2.16 Watts). The minimum on-state current stands at 10 mA, which guarantees reliable switching even with low-power loads.

Mechanical and Environmental Parameters

The Allen-Bradley 1762-OW8 operates reliably in clean, dry industrial environments with a Pollution Degree 2 rating. Its physical dimensions match the standard MicroLogix expansion form factor, and it weighs only 0.50 lbs (228 g). The module carries an IP20 enclosure rating, offering basic protection against solid objects larger than 12mm. For installation, it supports EN 50022 35 x 7.5 mm or 35 x 15 mm DIN rails. In high-vibration or shock-prone environments, we strongly advise using DIN rail end anchors. Alternatively, panel mounting works better for applications with more severe vibration demands. Also, keep debris from falling into the module during installation, as this could cause internal damage.

Installation and Wiring Guidance

Installing the 1762-OW8 is straightforward. You connect it to the MicroLogix bus via a ribbon cable that terminates to the adjacent expansion module or the base controller. A critical consideration involves the power supply distance rating: you must install this module 6 modules away from the host device's power supply to ensure stable operation. When using it with a MicroLogix 1100, you can install up to four modules. For MicroLogix 1200, it supports up to six modules, and for MicroLogix 1400, you may install up to seven modules. To extend the relay contacts' lifespan, we highly recommend connecting surge suppressors across inductive loads. This practice effectively protects against high-inrush currents. Moreover, you must introduce the 1762-OW8 properly in the hardware configuration of your controller software; otherwise, the system will not recognize it.

Typical Applications

This module excels at energizing magnetic contactors, relay coils, and solenoid-actuated devices. It also works commonly for signaling RUN and START commands to variable frequency drives, motor starters, and similar equipment. Beyond these uses, the 1762-OW8 is ideal for driving pilot lamps, indicator panels, alarm annunciators, buzzers, horns, and other discrete signaling devices. Its versatility makes it a valuable component in factory automation, material handling, and process control systems across many industries.

Packaging List

• Allen-Bradley 1762-OW8 Relay Output Module (1 unit)

• Ribbon cable for bus connection

• DIN rail mounting clips (pre-installed)

• Removable terminal block connector

• Quick start installation guide (printed)

Frequently Asked Questions (FAQ)

1. Which controllers work with the 1762-OW8?
The 1762-OW8 works seamlessly with MicroLogix 1100, 1200, and 1400 controllers. You can add up to 4 modules for the 1100, up to 6 for the 1200, and up to 7 for the 1400 series.

2. What current can each output point handle on the 1762-OW8?
Each of the eight output points supports a continuous current of up to 2.5A. The total current per common group is 8A, and the entire module handles up to 16A.

3. Why does the power supply distance rating matter for this module?
You must install the 1762-OW8 at least 6 modules away from the power supply. Following this guideline prevents voltage drop and maintains stable signal integrity across the bus.

4. Can I mount the 1762-OW8 on a DIN rail?
Yes, the 1762-OW8 supports both DIN rail mounting and panel mounting. For high-vibration environments, panel mounting works best, while DIN rail mounting with end anchors suits standard conditions.

5. How do I protect the relay contacts from premature wear?
We recommend installing surge suppressors across external inductive loads. This practice minimizes the effects of inrush current and significantly extends the contact life of the 1762-OW8.