Allen-Bradley 1790-T8BV8VX: Compact Mixed I/O Expansion Module

Expand your DeviceNet system with flexible digital control. The Allen-Bradley 1790-T8BV8VX combines sensor inputs and control outputs in one unit. This compact module adds eight universal inputs and eight sinking outputs to your network. It is perfect for adding localized control points to machines and processes.

Detailed Technical Specifications

• Product Model: Allen-Bradley 1790-T8BV8VX (CompactBlock LDX Series).
• I/O Configuration: 8 Universal Inputs + 8 Sinking Outputs (all 24V DC).
• Input Characteristics: 4.8 kΩ impedance, 8 mA on-state current, works with NPN/PNP sensors.
• Output Rating: 0.5A per point, 4.0A per common group, 0.5V max voltage drop.
• Response Time: Fast switching with under 1.0 ms output delay.
• Power Supply: 24V DC nominal (10-28.8V field power, 11-28.8V DeviceNet power).
• Isolation: 1250V AC optical isolation between field circuits and internal logic.
• Communication: Built-in DeviceNet port for network integration.

Installation & Environmental Data

• Wiring Method: M3.0 screw terminal block for reliable field connections.
• Torque Specification: Tighten terminals to maximum 7 lb-in (0.79 Nm).
• Mounting: Simple screw mount or DIN rail compatible for easy panel installation.
• Visual Indicators: Sixteen green LEDs (eight for inputs, eight for outputs) for instant status.
• Operating Altitude: Rated for use up to 2,000 meters above sea level.
• Module Weight: Lightweight at only 0.06 lbs (0.03 kg).

Packaging & Support Details

• Package includes one 1790-T8BV8VX I/O expansion module.
• This product comes with a standard 12-month warranty.
• Fast worldwide shipping available via FedEx, UPS, and DHL.

Expert FAQs

• How do I configure the inputs for sinking vs. sourcing sensors?
  The configuration is done electronically through the DeviceNet master scanner settings, not by physical jumpers. This allows you to change sensor types remotely without touching the module wiring.
• What is the practical advantage of 8 separate commons for the inputs?
  Having independent commons (8 points/8 COM) allows each input to reference a different ground or voltage source. This is useful when monitoring signals from different electrical sections of a machine.
• Can this module be used as a standalone device?
  No. The 1790-T8BV8VX is an expansion module that must be connected to a DeviceNet network and controlled by a master scanner (like a PLC with a DeviceNet card) to function.
• What happens if the input voltage drops below 9.6V DC?
  The input may not reliably turn on. Ensure your sensor's output and wiring provide adequate voltage at the module's terminals, accounting for any line loss, especially over long cable runs.
• Is external fusing required for the outputs?
  While the module has electronic protection, best practice is to install external fuses (rated slightly above 0.5A) on each output circuit. This protects the wiring and module in case of a short circuit at the load.

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