Allen-Bradley 1790D-8BV8B Compact 8 Input/8 Output Base Module

Technical Specifications Breakdown

Key parameters for the 1790D-8BV8B are listed below for quick reference:

Compact Distributed I/O for Space-Constrained Applications

The Allen-Bradley 1790D-8BV8B is a 24V DC base module that integrates 8 universal input points and 8 sourcing output points into a single, space-saving unit. Designed for the ArmorBlock series, this module eliminates the need for separate enclosures in many machine-mount applications. Its nonisolated design and 37-pin D-shell connector simplify wiring while maintaining robust performance in industrial environments.

Industry Applications: Solving Real-World Wiring Challenges

In packaging lines, the 1790D-8BV8B reduces cabinet space by mounting directly on the machine frame. The 8 universal inputs handle both sinking and sourcing sensors (e.g., proximity or photoelectric), while the 8 sourcing outputs drive small actuators or indicator lights. Each output supports up to 0.5 A, suitable for solenoid valves or contactors with low inrush. The 4.0 A per common limit ensures safe current distribution across multiple outputs.

For material handling conveyors, the module’s 1.2 W max dissipation keeps heat low in enclosed areas. The 1250V ac rms isolation between I/O and logic protects the controller from field-side surges. Engineers can reduce wiring errors by using the 37-pin D-shell connector for pre-made cables, speeding up installation.

Installation & Setup Guidance

Mount the 1790D-8BV8B on a flat surface using the integral mounting holes. Connect DeviceNet power separately per the base module supply voltage range (11…28.8V DC). Field power must be within 10…28.8V DC. Use the 37-pin D-shell connector for all I/O wiring; ensure cable shields are grounded at one end to prevent ground loops. Configure input type (sinking or sourcing) via the DeviceNet network. Verify that total output current per common does not exceed 4.0 A.

Maintenance & Reliability

Inspect the module periodically for dust accumulation on the connector pins. Ensure ambient temperature stays within the module’s operating range (not specified in data; verify with manufacturer). The photocoupler isolation provides long-term reliability against electrical noise. No field-replaceable fuses are present; protect outputs with external fuses rated for 0.5 A per channel.

Compatibility & Integration

The 1790D-8BV8B integrates with DeviceNet networks. It communicates as a slave device, exchanging I/O data with a scanner. Use standard DeviceNet cables and termination resistors. The module supports both polled and change-of-state messaging. For configuration, use RSNetWorx for DeviceNet or similar tools. The nonisolated DeviceNet power simplifies wiring but requires a common ground with the network.

Selection Guide & Purchasing Advice

When selecting the 1790D-8BV8B, confirm that your application requires 8 inputs and 8 outputs in a compact form factor. For higher channel counts, consider the 1790D-16BV16B. AutoDCSTech stocks the 1790D-8BV8B and can advise on compatibility with your existing DeviceNet system. Please verify current lifecycle status and availability with AutoDCSTech before ordering.

Troubleshooting & Common Issues

If outputs fail to energize, check the field power supply voltage (must be 10…28.8V DC). Verify that the DeviceNet network is active and the module’s node address is unique. For erratic input readings, inspect the sensor wiring and ensure the input type matches the sensor (sinking vs. sourcing). Use the 8 green status LEDs on both input and output banks to quickly identify faulty channels. If a channel remains on, measure off-state leakage (max 0.5 mA) to rule out false triggering.