Allen-Bradley 1790-8BV8VX: Flexible 16-Point Digital I/O Module

Simplify your DeviceNet network expansion with one compact module. The Allen-Bradley 1790-8BV8VX combines eight universal inputs and eight sinking outputs. This versatile module accepts both sinking and sourcing sensors on its input side. It provides a cost-effective way to add digital control points to your automation system.

Detailed Technical Specifications

• Product Model: Allen-Bradley 1790-8BV8VX (1790 Series Compact I/O).
• I/O Configuration: 8 Universal Inputs + 8 Sinking Outputs (all 24V DC).
• Input Type: Non-isolated, configurable as sinking or sourcing, 8.0 mA at 28.8V DC.
• Output Capacity: 0.5A per point, 4.0A total per common group, 0.5V max drop.
• Switching Speed: Input/Output response time under 1.0 millisecond.
• Power Supply: 24V DC field power (10-28.8V) and DeviceNet bus power (11-28.8V).
• Isolation: 1250V AC RMS isolation between field I/O and internal logic.
• Communication: DeviceNet network interface for remote control and monitoring.

Installation & Wiring Information

• Connection Method: All I/O and power connections via a single 37-pin D-sub connector.
• Mounting: Standard 35mm DIN rail mounting for easy installation.
• Wiring Groups: Inputs and outputs are grouped as 8 points with 8 separate commons.
• Power Consumption: Low field power use, approximately 6 mA per active point.
• Visual Indicators: Sixteen green LEDs (eight for inputs, eight for outputs) for instant status.

Packaging & Support Details

• Package includes one 1790-8BV8VX I/O module ready for network integration.
• This product includes a standard 12-month warranty for reliable operation.
• Global shipping available via FedEx, UPS, and DHL for fast delivery.

Expert FAQs

• What does "universal input" actually mean in practice?
  It means you can wire either a PNP (sourcing) or NPN (sinking) proximity sensor to the same terminal without changing hardware. You configure the input behavior through your DeviceNet master scanner settings.
• Can I connect a 2-wire DC sensor directly to the input?
  Yes. The 4.8 kΩ input impedance and 8 mA requirement are compatible with most standard 2-wire DC sensors. Always verify your sensor's leakage current is below the 5V DC off-state threshold.
• What is the advantage of separate commons for each I/O point?
  Having individual commons (8 points/8 COM) gives maximum wiring flexibility. You can connect each input or output to a different voltage reference or ground point if needed by your machine design.
• How much current can I draw from the DeviceNet power taps?
  The module itself consumes up to 1.2W from the DeviceNet bus. The available power for downstream devices depends on your network's total supply capacity and the number of other nodes. Always calculate your network's total power budget.
• Is this module suitable for controlling small relay coils?
  Absolutely. The 0.5A output rating is perfect for driving the coils of small industrial relays, pilot lights, or solenoid valves directly, making it an ideal interface between your network and power components.

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