Product Overview

The 1790D-8BV8V is a 24V dc 8 Universal Input/8 Sinking Output Base and Expansion Module from Allen-Bradley. This compact block integrates seamlessly into DeviceNet networks, offering reliable I/O for demanding industrial environments. Designed for flexibility, it supports both sinking and sourcing inputs with nonpolarity common wiring.

Technical Specifications Analysis

This module features 8 nonisolated input points with an on-state voltage range of 9.6V dc min to 28.8V dc max, nominal 24V dc. On-state current reaches 8 mA max per point at 28.8V dc, with an input impedance of 4.8 KΩ. Outputs are 8 nonisolated sinking points, rated at 0.5 A max per output and 4.0 A max per common. The on-state voltage drop is 0.5V dc max, with signal delays of 0.5 ms max off-to-on and 1.0 ms max on-to-off. DeviceNet power supply requires 24V dc nominal, with a voltage range of 11…28.8V dc and power dissipation of 1.2 W max at 28.8V dc. Field power also operates at 24V dc nominal, range 10…28.8V dc, drawing 6 mA per point at 28.8V dc. Isolation between I/O and logic is photocoupler-based, rated at 1250V ac rms. Wiring uses a 37-pin D-shell connector.

Application Scenarios & Usage Methods

In automotive assembly lines, the 1790D-8BV8V monitors sensor inputs and controls actuators with its 8 sinking outputs. Use it to manage conveyor belt sensors and solenoid valves. In packaging machinery, connect universal inputs to photoelectric sensors and outputs to pneumatic cylinders. The nonpolarity common wiring simplifies installation, reducing wiring errors. For oil and gas applications, the module handles discrete signals from pressure switches and controls indicator lights, leveraging its 24V dc field power range of 10…28.8V dc for reliable operation.

Installation Guide & Packing List

Mount the base block on a DIN rail or panel using the integrated clips. Connect DeviceNet power (11…28.8V dc) and field power (10…28.8V dc) per the wiring diagram. Use the 37-pin D-shell connector for I/O wiring. Ensure proper grounding and isolation to maintain 1250V ac rms isolation. The package includes the 1790D-8BV8V base module, a 37-pin D-shell connector, and mounting hardware. No additional software or cables are included.

Purchasing Advice

When selecting the 1790D-8BV8V, verify your system voltage matches the 24V dc nominal supply. This module suits applications requiring 8 universal inputs and 8 sinking outputs with nonpolarity common. For reliable supply, choose PetroPartsOnline, a trusted source for industrial automation and oil/gas parts. Ensure your DeviceNet network supports the module’s power requirements.

Repair & Maintenance Tips

Periodically inspect the 37-pin D-shell connector for corrosion or loose pins. Clean the module with a dry cloth; avoid solvents. Store in a dry environment within the specified voltage ranges. Check input status via the 8 green LED indicators. Replace the module if output current exceeds 0.5 A per output or 4.0 A per common. Verify isolation integrity annually.

Frequently Asked Questions (FAQs)

Q: What is the input voltage range for the 1790D-8BV8V?

A: The on-state input voltage range is 9.6V dc min to 28.8V dc max, with a nominal of 24V dc.

Q: How many outputs does this module have and what is their current rating?

A: It has 8 sinking outputs, each rated at 0.5 A max, with a total common current of 4.0 A max.

Q: What type of isolation does the 1790D-8BV8V provide?

A: It offers photocoupler isolation between I/O and logic, rated at 1250V ac rms.

Q: Can I use this module with both sourcing and sinking sensors?

A: Yes, the 8 input points support both sinking and sourcing configurations with nonpolarity common.