Allen-Bradley 1790D-T0B32 24V DC 32-Point Sourcing Output Base Module

Product Introduction

When industrial applications demand reliable high-density output control, the Allen-Bradley 1790D-T0B32 delivers. This 24V DC 32-point sourcing output base module provides nonisolated outputs with fast switching and robust isolation. Part of the Allen-Bradley 1790D series, it is designed for seamless integration into automation systems requiring multiple output points in a compact form factor.

Technical Specifications Breakdown

The 1790D-T0B32 offers 32 nonisolated sourcing outputs, each capable of handling 0.5 A max, with a common rating of 4.0 A max per 16-point common group. The on-state voltage ranges from 10V DC min to 28.8V DC max, with a nominal 24V DC, and the on-state voltage drop is just 0.5V DC max. Off-state leakage is limited to 0.5 mA max, ensuring minimal power waste. Signal delays are fast: 0.5 ms max from Off to On, and 1.0 ms max from On to Off, enabling responsive control.

For power, the base module accepts 11…28.8V DC (nominal 24V DC) with a maximum power dissipation of 1.2 W at 28.8V DC. Field power also runs at 10…28.8V DC (nominal 24V DC), drawing 6 mA per point at 28.8V DC. Isolation between I/O and logic uses photocoupler technology, rated at 1250V AC rms. Wiring connects via a terminal block with M3.0 screws, torqued to 7 lb-in max using copper or copper-clad aluminum conductors.

Industry Applications

This module excels in manufacturing lines where multiple actuators, solenoids, or indicator lights need centralized control. For example, in a packaging facility, the 1790D-T0B32 can manage 32 separate outputs for conveyor diverters and reject gates, with fast signal delays ensuring precise timing. In automotive assembly, it controls pneumatic valves and warning beacons, while the photocoupler isolation protects the logic side from field transients.

Compared to competing 32-point output modules, the 1790D-T0B32 offers a balanced combination of current capacity and switching speed. Many alternatives provide similar point counts but may lack the 0.5 ms Off-to-On delay or the 1250V AC rms isolation, making this module a strong choice for noise-prone environments.

Installation & Setup Guidance

Mount the 1790D-T0B32 on a DIN rail or panel using the provided base. Connect field wiring to the terminal block with M3.0 screws, tightening to 7 lb-in max. Use copper or copper-clad aluminum conductors for reliable connections. Ensure the supply voltage stays within 10…28.8V DC for field power and 11…28.8V DC for module power. Verify that total output current per common group does not exceed 4.0 A, and per output stays under 0.5 A. The 32 green LED indicators provide immediate visual status for each channel, simplifying commissioning.

Maintenance & Reliability

Routine inspection of the terminal block connections and LED indicators helps maintain uptime. Check for loose wires or signs of overheating, especially near high-current outputs. The photocoupler isolation reduces wear on logic circuits by blocking electrical noise and transient surges. Because the module uses solid-state outputs, there are no mechanical contacts to degrade, extending service life. Regular verification of supply voltage within the specified range ensures consistent performance and prevents premature failure.

Buying Guide & Selection Advice

Before purchasing the 1790D-T0B32, confirm your system's voltage requirements (24V DC nominal) and output current needs per channel. Verify that your controller supports sourcing output modules and that the 32-point density fits your I/O layout. For replacement or new installations, check compatibility with your existing Allen-Bradley rack or bus coupler. BluePLC Industrial offers this module with expert support to help you select the right configuration. Contact our team for current availability and lifecycle status.