1790-8BV8BX Allen-Bradley I/O Module

1790-8BV8BX Sourcing Output Base Unit

Product Introduction

The 1790-8BV8BX is a versatile I/O module from Allen-Bradley. It combines 8 universal input points with 8 sourcing output points. This module runs on a nominal 24V DC supply. Its nonisolated design simplifies integration. Additionally, it supports both sinking and sourcing input wiring.

Technical Specifications

Input Specifications

• 8 input points are nonisolated and nonpolarity.

• On-state voltage ranges from 9.6V DC min to 28.8V DC max.

• Maximum on-state current is 8 mA per point at 28.8V DC.

• Off-state voltage stays below 5V DC max.

• Nominal input impedance is 4.8 KΩ.

• 8 green LEDs indicate input status.

• Common type: 8 points share 8COM.

Output Specifications

• 8 sourcing output points are nonisolated.

• On-state voltage requires at least 10V DC (24V nom, 28.8V max).

• Voltage drop is only 0.5V DC max when on.

• Minimum on-state current is 1 mA per channel.

• Off-state leakage stays under 0.5 mA.

• Delay from off to on is 0.5 ms max; on to off is 1.0 ms max.

• 8 green LEDs show output status clearly.

• Each output handles 0.5 A max, with 4.0 A max per common.

• Common type: 1790D-8BV8B uses 8 points per common.

General & Power Specifications

• DeviceNet power is not required on the base module.

• Supply voltage is 24V DC nominal (range 11…28.8V DC).

• Power dissipation reaches 1.2 W max at 28.8V DC.

• Field power needs 24V DC nominal (range 10…28.8V DC).

• Field power dissipation is 6 mA per point at 28.8V DC.

• Isolation: photocoupler isolation between I/O and logic.

• Isolation voltage is 1250V AC rms.

• DeviceNet to logic and DeviceNet power are nonisolated.

• Wiring uses a 37-pin D-shell connector.

Mechanical & Environmental Parameters

Operating temperature range is 0…55°C. Storage temperature ranges from -40…85°C. Relative humidity stays between 5…95% noncondensing. Vibration resistance meets 5 g at 10…500 Hz. Shock resistance is 30 g. The module mounts on a DIN rail or panel. Its compact size saves cabinet space.

Installation Guide

First, ensure the field power is off before wiring. Next, connect the 24V DC supply to the correct terminals. Then, wire input devices to the 37-pin D-shell connector. For outputs, connect sourcing loads accordingly. After wiring, mount the 1790-8BV8BX securely on a DIN rail. Finally, apply power and check the green status LEDs. Each LED confirms the corresponding point is active.

Packaging List

• 1790-8BV8BX base module (1 unit)

• 37-pin D-shell connector (1 piece)

• Quick start guide (1 copy)

• DIN rail mounting clips (2 pieces)

Shipping

We ship via Fedex, UPS, or DHL for fast and reliable delivery. Tracking numbers are provided within 24 hours.

Frequently Asked Questions (FAQ)

1. Can the 1790-8BV8BX accept both sinking and sinking inputs?
Yes, the 8 input points support either sinking or sourcing wiring. Nonpolarity design makes this very flexible.

2. What happens if my output current exceeds 0.5 A per point?
Exceeding 0.5 A may damage the output channel. Always keep per-point current at or below the rated limit.

3. Is the 1790-8BV8BX isolated from the DeviceNet network?
No, DeviceNet to logic is nonisolated. However, I/O to logic has 1250V AC photocoupler isolation.

4. How do I know if an input or output is active?
Each point has its own green status LED. When lit, the point is actively on.

5. Can I use this module with 12V DC field devices?
No, the minimum on-state voltage is 10V DC for outputs and 9.6V DC for inputs. 12V DC works, but the nominal is 24V DC.