Allen-Bradley 1790-8BV8BX 24V DC 8 Universal Input/8 Sourcing Output Base Module

Product Overview

The Allen-Bradley 1790-8BV8BX is a 24V DC base module designed for compact industrial automation systems. It combines 8 universal inputs with 8 sourcing outputs in a single unit, reducing panel space and simplifying wiring. By integrating input and output functions, it minimizes component count and potential failure points, offering a cost-effective solution for machine builders.

Technical Specifications Breakdown

Key parameters for the 1790-8BV8BX are listed below for quick reference:

Industry Applications

Packaging Machinery

In high-speed packaging lines, the 1790-8BV8BX handles sensor inputs and actuator outputs with fast response times. The output signal delay is only 0.5 ms max off-to-on and 1.0 ms max on-to-off, ensuring precise timing for glue applicators or cutters. This reduces scrap and improves throughput.

Material Handling Systems

For conveyor systems, the module's 8 sourcing outputs can drive solenoids or indicator lights directly. The 0.5 A per output rating is sufficient for small relays, while the 4.0 A per common rating supports multiple loads. The nonisolated design simplifies wiring in grounded systems.

Assembly Stations

In robotic workcells, the universal inputs accept both sinking and sourcing signals from proximity sensors or limit switches. The 24V dc nominal supply voltage matches common industrial power, reducing the need for additional converters.

Installation & Setup Guidance

Mount the 1790-8BV8BX on a DIN rail in a clean, dry enclosure. Use the 37-pin D-shell connector for field wiring; ensure the connector is fully seated and locked. Connect the DeviceNet power (if used) according to the base module specifications. For the field power supply, apply 24V dc nominal within the 10…28.8V dc range. Verify that the total output current does not exceed 4.0 A per common. Use twisted-pair wiring for long runs to minimize noise.

Maintenance & Reliability

Inspect the module periodically for dust accumulation or loose connections. The photocoupler isolation between I/O and logic provides 1250V ac rms isolation, protecting the controller from field transients. Ensure the ambient temperature stays within the module's operating range to prevent overheating. No routine calibration is required.

Compatibility & Integration

This module is part of the Allen-Bradley 1790 series and integrates with DeviceNet networks. It is compatible with 1790 expansion modules, such as the 1790D-8BV8B, for additional I/O points. The nonisolated DeviceNet power simplifies system design, but verify grounding per the installation manual.

Selection Guide & Purchasing Advice

When selecting the 1790-8BV8BX, confirm your system's voltage requirements and I/O count. For larger systems, pair it with expansion modules. AutoDCSTech stocks the 1790-8BV8BX and can advise on lifecycle status. Please verify current availability before ordering.

Troubleshooting & Common Issues

If outputs fail to energize, check the field power supply voltage (10…28.8V dc) and the output current limits (0.5 A per output). For input issues, verify the on-state voltage is between 9.6V and 28.8V dc. Use the 8 green status LEDs on both input and output banks to quickly identify faulty points. If the module does not communicate, inspect the DeviceNet cable and terminator resistors.