Product Overview

The Allen-Bradley 1794-IA8I belongs to the Flex I/O 1794 series of input modules. This module has 8 isolated input points for AC signal monitoring. The Allen-Bradley 1794-IA8I mounts inside a terminal base unit for field device connection. You can insert or remove the module without powering down the system. The isolated inputs are ideal for motor control centers and control transformers. The Allen-Bradley 1794-IA8I has XT versions for extreme environment operation.

Technical Specifications

The Allen-Bradley 1794-IA8I delivers reliable AC input monitoring for Flex I/O systems. All parameters follow the official datasheet.

Input Specifications

• Inputs: 8 isolated points

• Nominal voltage: 120 Volts AC

• On-state voltage minimum: 65 Volts AC

• On-state voltage maximum: 132 Volts AC

• Off-state voltage maximum: 43 Volts AC

Current Ratings

• On-state current minimum: 7.1 milliamps

• On-state current maximum: 14.32 milliamps

• Nominal input current: 12 mA at 120V AC

• Off-state current minimum: 2.9 mA

Filter Times

• Off to On filter time: 8.4 milliseconds

• On to Off filter time: 26.4 milliseconds

• The Allen-Bradley 1794-IA8I provides stable input signal filtering.

Power & Dissipation

• Flexbus current: 30 mA at 5V DC

• Power dissipation: 4.5 Watts maximum at 132V AC

Status Indicators

• LEDs: 16 yellow status indicators

• Indication: One LED per channel for input status

• The Allen-Bradley 1794-IA8I provides clear visual feedback.

Compatible Terminal Base Units

• 1794-TBN

• 1794-TB2

• 1794-TB3

• 1794-TB3S

• 1794-TBKD

Communication Options

• ControlNet

• DeviceNet

• EtherNet/IP

• Universal Remote I/O

Environmental Specifications

• Operating temperature: 0°C to 55°C (32°F to 131°F)

• Relative humidity: 5 to 95 percent non-condensing

• XT versions available: For extreme environment operation

Mounting

• Mounting method: DIN rail

• The Allen-Bradley 1794-IA8I installs easily in standard panels.

Physical Specifications

• UPC: 10612598179920

Installation Guide

Follow these steps to install the Allen-Bradley 1794-IA8I correctly.

1. Mount the terminal base unit on DIN rail in your panel.

2. Select a compatible base from the 1794-TBN, TB2, TB3, TB3S, or TBKD series.

3. Wire field devices to the terminal base unit before module insertion.

4. Insert the 1794-IA8I into the terminal base without powering down.

5. Verify the yellow LEDs illuminate when AC inputs are active.

6. Connect to your network using ControlNet, DeviceNet, EtherNet/IP, or Remote I/O.

7. Monitor input status on the Allen-Bradley 1794-IA8I through the Flex I/O system.

Packing List

This package for the Allen-Bradley 1794-IA8I includes the following items.

• Allen-Bradley 1794-IA8I AC digital input module (one unit)

• Product documentation and installation guide

• Anti-static protective bag

Frequently Asked Questions (FAQ)

1. How many input points does the 1794-IA8I have?
The Allen-Bradley 1794-IA8I has 8 isolated input points. Each point has its own yellow LED status indicator for visual feedback.

2. What is the nominal voltage for the 1794-IA8I?
The nominal voltage is 120 Volts AC for the Allen-Bradley 1794-IA8I. The operating range is 65V to 132V AC for on-state detection.

3. Can I remove the 1794-IA8I without powering down?
Yes, the Allen-Bradley 1794-IA8I supports removal without system power down. The module has no direct wiring to the terminal base.

4. What terminal bases work with the 1794-IA8I?
The Allen-Bradley 1794-IA8I works with 1794-TBN, 1794-TB2, 1794-TB3, 1794-TB3S, and 1794-TBKD. These bases provide field wiring connections.

5. What is the power dissipation of the 1794-IA8I?
The power dissipation is 4.5 Watts maximum at 132V AC for the Allen-Bradley 1794-IA8I. The Flexbus current draw is 30 mA at 5V DC.