Product Overview

The 1769-OW8I is a high-performance electromechanical relay expansion module designed for the Allen-Bradley CompactLogix and MicroLogix 1500 platforms. Unlike standard relay modules, the 1769-OW8I features individually isolated outputs, providing eight normally open (N.O.) contacts divided into two groups of four. This architectural isolation allows engineers to mix different voltage sources—such as 120V AC and 24V DC—within the same module without risk of cross-talk or electrical interference. It is an essential component for applications requiring galvanic isolation between the controller backplane and field-floor actuators like solenoid valves and motor starters.

Technical Specifications

• Module Type: Digital Relay Output (Individually Isolated)

• Output Points: 8 Normally Open (N.O.)

• Isolation Groups: 2 groups (4 points per group, individually isolated)

• Operating Voltage Range: 5–265V AC / 5–125V DC

• Backplane Current Draw: 125 mA @ 5.1V DC / 100 mA @ 24V DC

• Max Current per Point: 2.5 A (Resistive)

• Max Current per Module: 16 A (Total)

• Minimum Load Current: 10 mA @ 5V DC

• Contact Life: 10,000,000 cycles (Mechanical); 100,000 cycles (Electrical at rated load)

• Signal Delay (On/Off): < 10 ms (Max)

• Heat Dissipation: 2.83 Watts (Max)

• Off-State Leakage Current: 0 mA (Ideal for high-impedance loads)

• Power Supply Distance Rating: 8 modules (Must be within 8 slots of a 1769 power supply)

• Dimensions: 118 x 35 x 87 mm (H x W x D)

Functional Integration and Protection

The 1769-OW8I provides robust interfacing for mixed-signal environments. Its mechanical relay design ensures zero off-state leakage, which is critical for preventing false "ON" states in sensitive indicator lamps or high-input-impedance safety relays.

• Group Isolation: Reinforced insulation (265V AC working voltage) ensures safety between the controller logic and field power.

• Interfacing: Directly compatible with CompactLogix 5370 CPUs and 1769-AENTR / 1769-ADN communication adapters for distributed I/O.

• Wiring Efficiency: Includes a Removable Terminal Block (RTB) to allow module replacement without disconnecting field-side wiring.