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

Product Overview

The Allen-Bradley 1790D-T0B32 is a 24V DC 32-point sourcing output base module designed for industrial automation systems. This compact module provides nonisolated sourcing outputs with photocoupler isolation, ensuring reliable signal transfer in demanding environments. With 32 green status indicators, operators can quickly monitor output states at a glance.

Technical Specifications Breakdown

The 1790D-T0B32 delivers precise output control with an on-state voltage range of 10V DC minimum to 28.8V DC maximum, with a nominal 24V DC. Each output channel supports a minimum on-state current of 1 mA and a maximum output current rating of 0.5 A. The off-state leakage current is limited to 0.5 mA maximum, ensuring clean signal transitions.

Signal response times are critical for high-speed applications. This module offers an off-to-on delay of 0.5 ms maximum and an on-to-off delay of 1.0 ms maximum, enabling rapid switching in control loops. The isolation voltage between I/O and logic is rated at 1250V AC RMS, provided by photocoupler isolation, protecting the control system from electrical noise and transients.

Power dissipation is minimal: 1.2 W maximum at 28.8V DC for the base module, and 6 mA per point at 28.8V DC for field power. The module operates from a DeviceNet power supply with a voltage range of 11 to 28.8V DC, and field power accepts 10 to 28.8V DC. Wiring uses terminal blocks with M3.0 screws, torqued to 7 lb-in maximum, using copper or copper-clad aluminum conductors.

Industry Applications

The 1790D-T0B32 excels in discrete manufacturing, packaging, and material handling systems where reliable 24V DC sourcing outputs are needed. Its fast signal delays make it suitable for high-speed sorting lines or pick-and-place machines. The photocoupler isolation ensures stable operation in electrically noisy environments, such as near variable frequency drives or welding equipment.

Comparison with Similar Modules

When compared to sinking output modules, the 1790D-T0B32 sourcing configuration simplifies wiring for positive-logic control systems. Unlike modules with lower output current ratings, the 0.5 A per output and 4.0 A per common rating provide ample drive capability for solenoids, relays, and indicator lights. The 1250V AC isolation exceeds many competing modules, offering superior protection against ground loops.

Installation & Setup Guidance

Mount the 1790D-T0B32 securely on a DIN rail or panel using the provided base. Connect DeviceNet power (11 to 28.8V DC) to the base module and field power (10 to 28.8V DC) to the output terminals. Use copper or copper-clad aluminum conductors and tighten M3.0 screws to 7 lb-in maximum. Ensure the common terminals are properly connected for each group of 16 outputs.

Maintenance & Reliability

Routine inspection of the 32 green status indicators helps identify output faults quickly. Keep the module free of dust and moisture to maintain isolation integrity. Periodically verify screw torque on terminal blocks to prevent loose connections. The photocoupler isolation provides long-term reliability by protecting the logic side from field-side transients.

Buying Guide & Purchasing Advice

Before purchasing the 1790D-T0B32, confirm your system requires 24V DC sourcing outputs with 32 points and 0.5 A per output. Verify compatibility with your DeviceNet network and field power supply range. BluePLC Industrial offers this module with expert support to ensure correct selection and integration.