Allen-Bradley 1790D-T0A6 120V AC 6 Output Base Module Overview

Product Overview

The Allen-Bradley 1790D-T0A6 is a 120V AC, 6 output base module designed for discrete output control in industrial automation. It provides six nonisolated output points with a load voltage range of 85…132V ac, making it suitable for switching AC loads in manufacturing lines, packaging systems, and material handling. Its compact base module design integrates directly with DeviceNet networks, reducing wiring costs and installation time.

Technical Specifications Breakdown

Key parameters for the 1790D-T0A6 are listed below for quick reference:

Industry Applications

Its 0.5A RMS per channel handles small motors and valves, while the 1 ms operate time ensures fast cycle times. The nonisolated outputs reduce component count, lowering overall system cost. In material handling, the 85-132V AC range allows direct connection to standard North American line voltages, eliminating additional transformers.

Installation & Setup Guidance

Mount the module on a DIN rail or panel using the integrated base. Use copper or copper-clad aluminum conductors with M3.0 terminal block screws tightened to 7 lb-in max. Connect the DeviceNet power supply (24V DC nom, 11-28.8V DC range) and external AC power (110V RMS, 60 Hz, 15-132V RMS range). Wire loads to the 6 output points and 6 common terminals. Ensure the recommended 1A, 250V normal blow fuse is installed in the load circuit. Verify isolation between I/O and logic via photocoupler (1250V AC RMS) and dielectric strength of 2500V RMS for 1 minute.

Maintenance & Reliability

Inspect the module periodically for loose connections and signs of overheating. Clean the enclosure with a dry cloth; avoid solvents. The 1.2W max DeviceNet power dissipation and 3.9W external AC power dissipation at rated current indicate low heat generation, extending component life. The 1000 MΩ minimum insulation resistance ensures reliable operation in dry environments. Check the green status indicators for normal operation.

Compatibility & Integration

The 1790D-T0A6 integrates with DeviceNet networks using a 24V DC nominal supply. It communicates with Allen-Bradley controllers and other DeviceNet-compatible devices. The 6 points/6 COM common type simplifies wiring for grouped loads. The nonisolated outputs share a common reference, reducing wiring complexity and cost.

Selection Guide & Purchasing Advice

When selecting this module, confirm your AC load voltage (85-132V AC) and current (0.5A RMS max per point). Ensure your DeviceNet network has adequate 24V DC power. For volume discounts or expedited shipping, contact AutoDCSTech.

Troubleshooting & Common Issues

If outputs fail to energize, check the external AC power supply voltage (15-132V RMS, 60 Hz) and the DeviceNet power supply (11-28.8V DC). Verify the recommended 1A fuse is intact. If the green status indicators are off, inspect the wiring and terminal block torque. For intermittent operation, measure the off-state leakage current (max 1.0 mA RMS at 100V RMS 60 Hz) and ensure it does not exceed load thresholds.