Allen-Bradley 1790D-T0B32: Maximum Density Output Control

Control a large number of devices from one network node. The Allen-Bradley 1790D-T0B32 packs thirty-two sourcing outputs into a single module. This high-density design is perfect for applications needing to command many solenoids, lights, or relays. It provides efficient use of panel space and network addresses.

Detailed Technical Specifications

• Product Model: Allen-Bradley 1790D-T0B32 (1790D Series Compact I/O).
• Output Configuration: 32 sourcing (PNP) outputs, non-isolated.
• Current Capacity: 0.5A per point, 4.0A maximum per common group.
• Voltage Operation: 10-28.8V DC field power range (24V DC nominal).
• Switching Speed: Fast response with ≤1.0 millisecond turn-off delay.
• Power Requirements: 24V DC field power and DeviceNet bus power (11-28.8V).
• Isolation: 1250V AC RMS optical isolation between field outputs and control logic.
• Common Grouping: Organized as two banks of sixteen outputs (16 points/2 COM).

Installation & Wiring Information

• Wiring Method: M3.0 screw terminal block for secure and flexible field connections.
• Torque Specification: Tighten terminals to a maximum of 7 lb-in (0.79 Nm).
• Conductor Type: Use only copper or copper-clad aluminum conductors.
• Visual Diagnostics: Thirty-two individual green LEDs provide clear status for every output.
• Mounting: Standard DIN-rail mounting for easy integration into control panels.
• Power Calculation: Each active output draws approximately 6 mA from the field power supply.

Packaging & Support Details

• Package includes one 1790D-T0B32 high-density output module.
• This product is covered by a standard 12-month warranty.
• Global shipping available via FedEx, UPS, and DHL for reliable delivery.

Expert FAQs

• What is the main advantage of sourcing outputs in a high-density module?
  Sourcing outputs provide the +24V signal, which is the standard required input for most modern PLCs and devices. This simplifies wiring diagrams and reduces the need for external power distribution to loads.
• How should I size the external field power supply?
  Calculate worst-case: 32 outputs × 0.5A = 16A theoretical maximum. In practice, use a 24V DC power supply rated for at least 125% of your expected simultaneous load current. Remember to add the module's own ~200mA quiescent current.
• What does "16 points/2 COM" mean for wiring?
  The thirty-two outputs are divided into two electrically separate banks of sixteen. Each bank has its own common wire. This allows you to use two different field power sources if needed, helping to manage total current and organize wiring.
• Can I use these outputs to control AC loads or higher voltage DC?No. This module is designed specifically for 10-28.8V DC loads only. Exceeding this voltage or switching AC will damage the outputs.
• What protection is recommended for the output circuits?
  Always install an external fuse (rated just above 0.5A, like 0.75A or 1A) on each output channel. For inductive loads (solenoids, relays), install a flyback diode directly across the load terminals to clamp voltage spikes when the output turns off.

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