1769-IA8I Allen-Bradley 8-Point Isolated Input Module

Allen-Bradley 1769-IA8I 8-Point 120VAC Isolated Input Module

Product Introduction

The 1769-IA8I module gives you eight individually isolated AC input channels. Allen-Bradley designed this unit for applications requiring maximum channel separation. Each input operates independently with its own isolation barrier. This feature proves essential in noisy industrial environments or when mixing different voltage sources.

Furthermore, this isolated input module accepts standard 100/120 VAC signals. Its operating voltage range spans from 79 to 132 VAC, which handles typical line voltage variations. The input frequency covers 47 to 63 Hz, making it compatible with most power systems worldwide. Each channel delivers reliable performance with a fixed 20 ms delay for signal transitions.

Key Feature: Individual Channel Isolation

What makes the 1769-IA8I special? Unlike non-isolated modules, each of the eight inputs has its own isolation barrier. The module provides 1517V AC for 1 second or 2145V DC for 1 second of isolation. This rating applies from input point to the bus and between groups. The working voltage isolation reaches 132V AC with IEC Class II reinforced insulation.

You can connect different AC sources to different channels without creating ground loops. This feature alone saves hours of troubleshooting in complex control panels.

Technical Specifications

Here are the complete electrical ratings for the 1769-IA8I:

• Manufacturer: Allen-Bradley

• Part Number: 1769-IA8I

• Product Line: CompactLogix

• Number of Inputs: 8 individually isolated channels

• Input Type: AC Digital Input

• Voltage Category: 100-120 VAC

• Operating Voltage Range: 79 to 132 VAC

• Input Frequency: 47 to 63 Hz

• On-State Voltage (min): 79 VAC

• On-State Voltage (max): 132 VAC

• Off-State Voltage (max): 20 VAC

• On-State Current (min): 5 mA at 74 VAC

• On-State Current (max): 12 mA at 120 VAC

• Off-State Current (max): 2.5 mA

• Maximum Inrush Current: 250 mA

• Input Impedance: 12 kOhm at 50 Hz / 10 kOhm at 60 Hz

• Input Delay (OFF to ON): 20 ms

• Input Delay (ON to OFF): 20 ms

Additionally, the module draws 90 mA at 5.1V DC from the backplane. Its heat dissipation reaches 1.81 Watts. Total power consumption is 33.6 Watts, while power dissipation sits at 7.5 Watts.

Isolation Specifications

The 1769-IA8I offers superior isolation compared to standard input modules:

Physical and Mechanical Specifications

The 1769-IA8I comes in a compact, rugged housing:

• Dimensions (HxWxD): 118 x 35 x 87 mm (4.65 x 1.38 x 3.43 in.)

• Height with mounting tabs: 138 mm (5.43 in.)

• Slot width: Single slot

• Weight: Approximately 0.61 lbs (280 grams)

• Enclosure Type: Open style

• Supported mounting: DIN rail or panel mount

Environmental Ratings

The 1769-IA8I handles demanding industrial conditions with ease:

• Operating Temperature: 0 to 60°C (32 to 140°F)

• Storage Temperature: -40 to 85°C (-40 to 185°F)

• Relative Humidity: 5-95% noncondensing

• Operating Vibration: 5g at 10-500 Hz

• Operating Shock (DIN rail): 20g

• Operating Shock (panel): 30g

• Non-operating Shock (DIN rail): 30g

• Non-operating Shock (panel): 40g

Power Supply Distance Rating

The 1769-IA8I has a power supply distance rating of 8 modules. This means you can install up to eight modules away from the power supply. For systems needing more than eight modules, you must add another power supply.

Compatible power supplies for the 1769-IA8I include:

• 1769-PA2

• 1769-PB2

• 1769-PA4

• 1769-PB4

This module works with two controller families:

• 1769 CompactLogix controllers

• MicroLogix 1500 controllers

Installation Guidelines

Follow these steps to install your 1769-IA8I module:

1. Power down the entire system before starting any installation.

2. Mount the module on a DIN rail or panel using the integrated tabs.

3. Slide the bus connector to engage with the adjacent module.

4. Secure the module by tightening the mounting screws (panel mount) or locking the DIN rail clip.

5. Insert the removable terminal block into the front of the module.

6. Connect your field wires following the terminal labels.

7. Apply power and verify communication with your controller.

Moreover, always observe the power supply distance rule. Do not place the 1769-IA8I beyond the 8-module limit without an additional power supply. The removable terminal block makes wiring changes simple and safe.

LED Indicators

The front panel of the 1769-IA8I includes individual LED status indicators. Each LED lights up when its corresponding channel detects an on-state voltage above 79 VAC. This visual feedback helps you troubleshoot field devices quickly without a multimeter.

Packaging List

Your shipment includes the following items:

• 1 x 1769-IA8I 8-Point Isolated AC Input Module

• 1 x Removable terminal block (installed)

• 1 x DIN rail mounting clip (attached)

• 2 x Panel mounting screws

Note: No certificates or warranty documents are included in the box.

Shipping Information

We ship all orders via FedEx, UPS, or DHL. Please allow 1-2 business days for processing.

Frequently Asked Questions (FAQ)

1. What is the difference between 1769-IA8I and 1769-IA16?
The 1769-IA8I offers eight individually isolated channels. The 1769-IA16 provides sixteen channels but with internally connected commons. Choose the 1769-IA8I when you need channel-to-channel isolation.

2. Can I mix 120VAC and 24VDC signals on the same 1769-IA8I?
No, the 1769-IA8I only accepts 79-132 VAC signals. Using DC voltage will damage the module.

3. What happens if I exceed the 8-module power supply distance?
You will need an additional power supply for modules beyond the eighth position. Otherwise, the 1769-IA8I may not receive sufficient power.

4. Does the 1769-IA8I work with MicroLogix 1500?
Yes, the 1769-IA8I works perfectly with MicroLogix 1500 systems. Simply install it next to the base module or any adjacent module.

5. Why do I need individually isolated inputs for my application?
Individual isolation prevents ground loops and protects against voltage differences between channels. The 1769-IA8I is ideal when inputs come from different power sources or distant locations.