1762-OB32T | Allen-Bradley | MicroLogix 32-Point Source Output Module

Product Overview

The 1762-OB32T is a high-density digital expansion module designed for the MicroLogix 1100, 1200, and 1500 controller families. This solid-state component provides thirty-two sourcing outputs in a compact form factor, significantly increasing the I/O capacity of a PLC system without requiring additional rack space. By utilizing the 1762-OB32T, engineers can drive multiple 24V DC field devices, such as solenoids, interface relays, and indicator lamps, with high reliability and rapid switching speeds.

Technical Specifications

• Manufacturer Allen-Bradley / Rockwell Automation

• Product Line MicroLogix 1762 Expansion I/O

• Model Number 1762-OB32T

• Output Type Solid-State Sourcing (Source)

• Number of Outputs 32 Channels

• Wiring Configuration Two (2) isolated groups of 16 channels each

• Nominal Operating Voltage 24V DC

• Operating Voltage Range 10.2V to 26.4V DC

• Current Rating (Per Channel) 0.5 A at 60 °C (140 °F)

• Current Rating (Per Group) 2.0 A at 60 °C (140 °F)

• Current Rating (Total Module) 4.0 A at 60 °C (140 °F)

• Surge Current Capacity 2.0 A (Repeatable every 2s for 10ms at 60 °C)

• Minimum On-State Current 1 mA

• Maximum Heat Dissipation 3.4 Watts

• Supported Wire Sizes 22 AWG, 24 AWG, and 26 AWG

• Shipping Weight 0.31 lbs (0.14 kg)

Hardware Installation and Thermal Management

The 1762-OB32T features a high-density design that requires careful attention to thermal loads. To maintain the 0.5 A per channel rating at elevated temperatures (60 °C), ensure that the total module current does not exceed 4.0 A. The module utilizes a ribbon-cable or high-density connector interface rather than traditional screw terminals to accommodate the 32-point count within a small footprint. It is recommended to use pre-wired cable assemblies to simplify integration and reduce wiring errors.

Comparison: 1762-OB32T vs. 1762-OB16

• Density The 1762-OB32T provides double the output capacity in the same physical width as the 16-point 1762-OB16 module.

• Wiring While the OB16 uses standard terminal blocks, the 1762-OB32T utilizes a high-density connector, often requiring an external terminal interface for field wiring.

• Application Ideal for systems with high actuator counts where panel space is strictly limited.

Frequently Asked Questions

• Does the 1762-OB32T support sinking output configurations?

  No, this module is strictly a "Sourcing" (Source) output type, meaning it provides the positive side of the 24V DC circuit to the load.

• What happens if an output is short-circuited?

  While solid-state, the 1762-OB32T should be protected by external fuses. Exceeding the 2.0 A surge rating or 0.5 A continuous rating per channel may cause permanent damage to the output transistors.

• Is this module compatible with the MicroLogix 1000?

  No, the 1762 expansion series is only compatible with the MicroLogix 1100, 1200, and 1500 series controllers.