Allen-Bradley 1790D-T0W6: Universal Relay Output Module

Switch a wide range of AC and DC loads with complete flexibility. The Allen-Bradley 1790D-T0W6 provides six independent relay outputs. Each relay can control different voltage types and levels, from low-voltage DC to 250V AC. This makes it the perfect interface for mixed-load control panels and machine I/O.

Detailed Technical Specifications

• Product Model: Allen-Bradley 1790D-T0W6 (1790D Series Compact I/O).
• Relay Configuration: 6 Form A (SPST-NO) relays, 1 point per common.
• Switching Capacity: 2.0A @ 24V DC, 30V DC, 30V AC, 125V AC, or 250V AC.
• Contact Life: 300K cycles (resistive), 100K cycles (inductive).
• Switching Speed: Turn ON/OFF delay less than 10 milliseconds each.
• Minimum Load: 100 µA at 100 mV DC required for reliable contact operation.
• Isolation: 1250V AC RMS between relay coils and DeviceNet logic.
• Power Supply: 24V DC field power (19.2-28.8V) for relay coils.

Installation & Wiring Information

• Wiring Method: M3.0 screw terminal block for secure load connections.
• Torque Specification: Tighten terminals to maximum 7 lb-in (0.79 Nm).
• Independent Contacts: Each relay has completely separate NO and COM terminals (1 point/1 COM).
• Visual Indicators: Six green LEDs show the energized status of each relay coil.
• Mounting: Standard DIN-rail mounting for easy panel installation.
• Power Consumption: Each energized relay coil draws approximately 10 mA at 24V DC.

Packaging & Support Details

• Package includes one 1790D-T0W6 relay output module.
• This versatile module is covered by a standard 12-month warranty.
• We ship worldwide using reliable carriers like FedEx, UPS, and DHL.

Expert FAQs

• What is the main advantage of having independent relay contacts?
  You can control six completely different electrical circuits. One relay could switch 24V DC for a lamp, another 120V AC for a fan, and another 240V AC for a heater—all from the same compact module without cross-interference.
• What does the "minimum load" requirement mean for my application?
  Relay contacts need a small current to "wet" the contact surface and break through oxidation. If your load (like a high-impedance PLC input) draws less than 100µA, you may need to add a "burden resistor" in parallel to ensure reliable switching.
• Can I use this module to directly start a single-phase AC motor?
  You could switch the power to a small motor (under 1/3 HP at 120V AC), but it's not recommended for motor starting due to high inrush current. Best practice is to use these relays to control the coil of a properly sized motor contactor.
• How do I protect the contacts when switching inductive loads?
  Always use contact protection. For DC inductive loads (solenoids), install a flyback diode across the load. For AC inductive loads, use an RC snubber network. This suppresses voltage spikes and extends contact life dramatically.
• What safety precautions are needed for high-voltage AC wiring?
  When switching 120V/240V AC, ensure all wiring complies with local electrical codes. Use proper gauge wire, install external fuses or circuit breakers for each circuit, and consider adding an emergency stop relay for the entire power circuit.

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