Allen-Bradley 1790D-T32BV0 24V DC 32 Universal Input Base Module

Product Overview

The Allen-Bradley 1790D-T32BV0 is a 24V DC 32 universal input base module designed for industrial automation systems. This module provides 32 input points that can be configured for sinking or sourcing operation, making it versatile for various sensor and switch interfaces. Part of the 1790D series, it integrates DeviceNet power directly on the base module, simplifying wiring and reducing panel space. With photocoupler isolation between I/O and logic, the 1790D-T32BV0 ensures reliable signal integrity in noisy environments.

Technical Specifications

The 1790D-T32BV0 operates with a supply voltage range of 11…28.8V DC (nominal 24V DC) and draws a maximum power dissipation of 1.2 W at 28.8V DC. Each of the 32 inputs accepts on-state voltages from 9.6V DC minimum to 28.8V DC maximum, with a nominal on-state voltage of 24V DC. Off-state voltage is 5.0V DC maximum. On-state current is 8 mA maximum per channel at 28.8V DC, and input impedance is 4.8 kΩ. The module features 32 green LED indicators for input status and uses a 16 points/4COM common configuration with non-polarity. Isolation between I/O and logic is provided by photocouplers rated at 1250V AC rms. DeviceNet to logic and DeviceNet power are nonisolated. Wiring uses a terminal block (M3.0) with a screw torque of 7 lb-in maximum, and copper or copper-clad aluminum conductors are required.

Industry Applications

The 1790D-T32BV0 is ideal for discrete manufacturing, material handling, and packaging lines where 24V DC sensors, pushbuttons, or selector switches need to be monitored. Its 32-point density suits applications requiring many inputs in a compact footprint, such as conveyor systems or assembly stations. The sinking/sourcing flexibility allows connection to both NPN and PNP sensors without additional hardware, reducing inventory complexity. In automotive or food processing plants, the photocoupler isolation helps prevent ground loops and protects the controller from voltage transients.

Installation & Setup Guidance

Mount the 1790D-T32BV0 on a DIN rail or panel using the integrated base. Connect 24V DC power to the DeviceNet power terminals, observing the 11…28.8V DC range. Wire field devices to the terminal block using copper or copper-clad aluminum conductors, tightening screws to 7 lb-in maximum. Configure inputs as sinking or sourcing per application needs; the common type is 16 points per 4COM with non-polarity. Verify on-state voltage is at least 9.6V DC and off-state voltage does not exceed 5.0V DC. Use the 32 green LEDs to confirm input status during commissioning.

Maintenance & Reliability

Periodically inspect the 1790D-T32BV0 for loose connections or debris on the terminal block. Ensure the ambient temperature stays within the module's operating range (not specified, but typical for industrial environments). The photocoupler isolation provides long-term reliability by protecting against electrical stress. No routine calibration is required; simply verify input signals match expected states. For extended service life, keep the enclosure clean and avoid moisture ingress. Contact BluePLC Industrial for replacement units if the module shows persistent faults.

Compatibility & Integration

The 1790D-T32BV0 integrates directly with DeviceNet networks, using the built-in DeviceNet power supply. It is compatible with Allen-Bradley controllers that support DeviceNet scanners, such as CompactLogix or ControlLogix platforms with 1756-DNB or 1769-SDN modules. The module's nonisolated DeviceNet interface simplifies wiring but requires careful grounding per DeviceNet guidelines. For systems using other fieldbuses, an external gateway may be needed. Always verify firmware compatibility with your scanner before installation.

Selection Guide & Purchasing Advice

Before purchasing the 1790D-T32BV0, confirm your system's DeviceNet power requirements and input voltage range (11…28.8V DC). Ensure the total input current per common does not exceed the module's ratings—each channel draws up to 8 mA. For applications needing more than 32 inputs, consider multiple 1790D-T32BV0 modules or a higher-density alternative. BluePLC Industrial stocks this module and can advise on availability, lead times, and compatible accessories. Contact our team to verify lifecycle status and ensure the 1790D-T32BV0 meets your project needs.

For complete technical specifications for the 1790D-T32BV0, please contact BluePLC Industrial.