Product Overview

The Allen-Bradley 1762-OW8 is a high-performance expansion relay output module designed for the MicroLogix 1100, 1200, and 1500 controller families. It provides eight physically isolated, normally open (N.O.) relay contacts that interface the PLC logic with high-power field devices such as motor starters, solenoids, and indicators. By utilizing electromechanical relays, this module allows for flexible switching of both AC and DC loads within a wide voltage range. We provide this unit as 100% Brand New and Original in factory packaging, ensuring reliable operation for your critical automated sequences.

Technical Specifications

Engineering Advantages

• Universal Load Compatibility: The 1762-OW8 switches both AC and DC voltages across its relay contacts. This versatility eliminates the need for separate digital output modules when managing mixed-voltage loads like 120V AC contactors and 24V DC pilot lights.

• Galvanic Isolation: The module provides robust electrical isolation between the field-side wiring and the PLC backplane. This protects the MicroLogix processor from high-voltage surges and electromagnetic interference (EMI) generated by inductive load switching.

• High Current Capacity: Each individual relay point handles up to 2.5 Amps. This high current rating allows the module to drive many small motors and industrial solenoids directly, bypassing the cost and space required for intermediate interposing relays.

• Seamless MicroLogix Integration: Designed for the 1762 expansion bus, the module snaps directly onto the right side of your MicroLogix controller or adjacent expansion modules. This compact "bus-connection" design requires no additional power wiring for module communication.

FAQs

Can the 1762-OW8 be used with a MicroLogix 1500 system?

Yes. While the MicroLogix 1500 primarily uses 1764-series base units and processors, it utilizes 1762-series expansion modules for its I/O growth. The 1762-OW8 is the standard 8-point relay expansion choice for MicroLogix 1100, 1200, and 1500 systems.

Does this module require an external 24V DC power supply?

The module draws its logic power directly from the controller via the 1762 expansion bus. However, you must provide the external load voltage (e.g., 120V AC or 24V DC) to the relay common terminals (VAC/VDC) to power your field devices.

What is the life expectancy of the internal relays?

The electromechanical relays typically provide approximately 10 million cycles under no-load conditions. Under full rated load, the life expectancy varies based on the inrush current. To extend relay life, we strongly recommend using external surge suppressors (RC networks for AC or flyback diodes for DC) when switching inductive loads like solenoids.

Is it possible to mix AC and DC voltages on the same module?

Yes, but you must be careful with common terminals. The 1762-OW8 groups outputs into shared common blocks. You can switch different voltages across different common groups, but all outputs sharing a single common terminal must use the same voltage source.