Allen-Bradley 1790D-8BV8B 24V DC 8 Universal Input/8 Sourcing Output Module

Product Introduction

When your automation system demands reliable distributed I/O, the Allen-Bradley 1790D-8BV8B delivers a compact solution. This 24V DC base module combines 8 universal inputs (sinking or sourcing) with 8 sourcing outputs in a single unit. Part of the 1790D series, it is designed for applications requiring nonisolated inputs and outputs with photocoupler isolation between I/O and logic. The module uses a 37-pin D-shell connector for wiring, simplifying installation in control panels.

Technical Specifications Breakdown

The 1790D-8BV8B operates on a 24V DC nominal supply with a voltage range of 11…28.8V DC for the base module and 10…28.8V DC for field power. Key specifications include:

Inputs: 8 points nonisolated, sinking or sourcing. On-state voltage: 9.6V DC min, 24V DC nom, 28.8V DC max. On-state current: 8 mA max per point at 28.8V DC. Off-state voltage: 5V DC max. Input impedance: 4.8 KΩ nominal. Indicators: 8 green status LEDs. Common: 8 points/8COM (nonpolarity).

Outputs: 8 points nonisolated, sourcing. On-state voltage: 10V DC min, 24V DC nom, 28.8V DC max. On-state voltage drop: 0.5V DC max. On-state current: 1 mA min per channel. Off-state leakage: 0.5 mA max. Output signal delay: Off to On 0.5 ms max, On to Off 1.0 ms max. Indicators: 8 green status LEDs. Output current rating: 0.5 A max per output, 4.0 A max per common. Common type: 8 points/8 COM.

Isolation: I/O to logic via photocoupler, isolation voltage 1250V AC rms. DeviceNet to logic and DeviceNet power are nonisolated.

Power: DeviceNet power supply voltage 24V DC nom, range 11…28.8V DC. Power dissipation: 1.2 W max at 28.8V DC. Field power dissipation: 6 mA at 28.8V DC per point.

Industry Applications

The 1790D-8BV8B excels in material handling, packaging, and assembly lines where space is limited. Its 8 universal inputs accept both sinking and sourcing signals, simplifying sensor integration. The 8 sourcing outputs drive small actuators, relays, or indicator lights directly. For example, in a conveyor system, inputs monitor part presence while outputs control diverters or alarms. The photocoupler isolation protects the logic side from electrical noise, ensuring stable operation in industrial environments.

Comparison with Similar Modules

Compared to the Allen-Bradley 1790D-8BV16B (16-point input module), the 1790D-8BV8B offers a balanced mix of inputs and outputs, reducing the need for separate I/O modules. Unlike the 1790D-8BV8B, the 1790D-8BV16B lacks outputs, requiring an additional output module for actuator control. The 1790D-8BV8B’s 0.5 A per output rating is suitable for low-power devices, while higher-current applications may need the 1790D-8BV8B with external relays. Both modules share the same 24V DC power and DeviceNet connectivity, simplifying inventory.

Installation & Setup Guidance

Mount the 1790D-8BV8B on a DIN rail or panel using the integrated mounting holes. Connect the 37-pin D-shell connector to field wiring. Ensure the supply voltage stays within 11…28.8V DC for the base module and 10…28.8V DC for field power. Use twisted-pair wiring for DeviceNet to minimize noise. The green status LEDs help verify input and output states during commissioning. Always disconnect power before making connections.

Maintenance & Reliability

With a maximum power dissipation of 1.2 W, the 1790D-8BV8B runs cool, extending component life. The photocoupler isolation reduces wear from electrical transients. Periodically check the 37-pin connector for tightness and inspect the module for dust accumulation. No routine calibration is required. For long-term reliability, operate within the specified voltage and current limits.

Buying Guide

Before purchasing, verify your system’s DeviceNet configuration and power supply compatibility. The 1790D-8BV8B requires a 24V DC supply with at least 1.2 W capacity. Ensure the 37-pin D-shell cable matches your field wiring. BluePLC Industrial stocks genuine Allen-Bradley 1790D-8BV8B modules with fast shipping. Contact our team for bulk pricing or replacement inquiries. For complete technical specifications, please contact BluePLC Industrial.