Allen-Bradley 1790D-8BV8B: Universal I/O with Sourcing Outputs

Add versatile control with outputs designed for modern sensors. The Allen-Bradley 1790D-8BV8B provides eight universal inputs and eight sourcing outputs. This module works perfectly with PNP (sourcing) field devices commonly used in European and modern designs. It connects directly to DeviceNet for easy system expansion.

Detailed Technical Specifications

• Product Model: Allen-Bradley 1790D-8BV8B (1790D Series Compact I/O).
• I/O Configuration: 8 Universal Inputs + 8 Sourcing (PNP) Outputs.
• Output Type: Sourcing outputs supply 24V DC to the load when active.
• Current Rating: 0.5A per output point, 4.0A maximum per common group.
• Input Characteristics: 4.8 kΩ impedance, recognizes signals from 9.6V to 28.8V DC.
• Switching Speed: Rapid response with ≤1.0 ms output switching delay.
• Power Requirements: 24V DC field power (10-28.8V) and DeviceNet bus power (11-28.8V).
• Isolation: 1250V AC optical isolation protects network electronics from field-side disturbances.

Installation & Wiring Information

• Connection Interface: All signals connect through a single 37-pin D-sub connector.
• Wiring Groups: Both inputs and outputs are arranged as 8 points with 8 independent commons.
• Mounting: Standard DIN-rail mounting for easy panel installation.
• Visual Diagnostics: Sixteen green LEDs provide clear status for all inputs and outputs.
• Power Consumption: Low field power draw, approximately 6 mA per active I/O point.

Packaging & Support Details

• Package includes one 1790D-8BV8B I/O module ready for installation.
• This product includes a standard 12-month warranty for reliable operation.
• Global shipping available via FedEx, UPS, and DHL for prompt delivery.

Expert FAQs

• What is the practical difference between sourcing and sinking outputs?
  A sourcing output (like this module's) provides the positive voltage (+24V) to the load. The load's other side connects to ground. A sinking output connects the load to ground, requiring external +24V.
• Can I connect a standard 2-wire DC sensor directly to the universal input?
  Yes, but carefully. A 2-wire sensor passes power and signal on the same wires. Ensure the sensor's leakage current in the off state is below 1.5 mA to prevent the module from falsely seeing an ON signal.
• Why would I choose sourcing outputs over sinking outputs?
  Sourcing outputs are often preferred when driving PLC digital inputs because they provide a clean voltage signal. They can also simplify cabinet wiring by providing a centralized power source for multiple loads.
• How does the 8 points/8 COM wiring benefit system design?
  It offers maximum wiring flexibility. You can wire each I/O point back to a different electrical reference or power supply if needed by your machine's design, preventing ground loop issues.
• What protective measures should I take with the outputs?
  Always use external fusing for each output circuit. For inductive loads like solenoid valves, install a flyback diode (for DC) across the load to absorb voltage spikes when the output turns off, protecting the module's internal electronics.

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