Allen-Bradley 1790-8BV8VX 24V DC Universal Input/Sinking Output Module

Product Overview

When your control system demands reliable I/O in a compact footprint, the Allen-Bradley 1790-8BV8VX delivers. This 24V DC base block integrates 8 universal inputs and 8 sinking outputs, making it a versatile choice for DeviceNet networks. Engineers often face space constraints and wiring complexity in panel design. The 1790-8BV8VX addresses these pain points by combining multiple I/O functions into a single, nonisolated block with a 37-pin D-shell connector for simplified wiring.

Technical Specifications

The 1790-8BV8VX operates with a DeviceNet supply voltage range of 11…28.8V DC and a field power range of 10…28.8V DC. Its output signal delay is 0.5 ms max from Off to On and 1.0 ms max from On to Off, ensuring fast response in time-sensitive applications. The module provides photocoupler isolation between I/O and logic with an isolation voltage of 1250V AC rms. Note that the DeviceNet-to-logic and DeviceNet power connections are nonisolated, which is typical for this class of base block.

Industry Applications

The 1790-8BV8VX excels in material handling, packaging, and assembly line control. For example, in a conveyor system, the 8 universal inputs can accept both sinking and sourcing signals from proximity sensors, while the 8 sinking outputs drive solenoid valves or indicator lights. This flexibility reduces the need for additional interface modules, lowering total system cost. In a packaging machine, the fast output signal delay helps maintain precise timing for label application or sealing operations.

Installation & Setup Guidance

Mount the 1790-8BV8VX on a DIN rail in a clean, dry enclosure. Connect the 37-pin D-shell connector to your field wiring harness. Ensure the DeviceNet power supply stays within 11…28.8V DC and the field power within 10…28.8V DC. Use twisted-pair cable for DeviceNet communication to minimize noise. Verify that the total output current per common does not exceed 4.0 A. The module's green status LEDs on each channel simplify troubleshooting during commissioning.

Maintenance & Reliability

To maximize uptime, periodically inspect the 1790-8BV8VX for signs of dust accumulation or loose connections. The nonisolated DeviceNet power design means that ground loops can occur if the system is not properly bonded. Check that all grounding connections meet the manufacturer's guidelines. Because the module uses photocoupler isolation between I/O and logic, electrical noise on the field side is less likely to affect the controller. Regular visual checks of the status LEDs can help detect channel faults early.

Buying Guide & Purchasing Advice

Before ordering the 1790-8BV8VX, verify your DeviceNet network configuration and power supply ratings. This module requires a 24V DC nominal supply for both DeviceNet and field power. Ensure your system's total output current per channel stays below 0.5 A and per common below 4.0 A. BluePLC Industrial stocks this Allen-Bradley base block and can advise on compatible cables and connectors. Contact our team for current lead times and bulk pricing.