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Allen-Bradley 1769-IA8I CompactLogix Individually Isolated AC Input Module

The Allen-Bradley 1769-IA8I, also cataloged as the 1769-IA8I Individually Isolated Discrete Input Module, provides AC voltage signal acquisition for CompactLogix and MicroLogix 1500 controller platforms. The module processes eight isolated 120 VAC input channels with direct electrical separation between field input points.

Hardware Specifications

Parameter	Specification
Model	1769-IA8I
Brand	Allen-Bradley
Origin	USA
Product Line	1769 Compact I/O
Module Type	Individually Isolated AC Discrete Input Module
Weight	0.38 lbs (0.17 kg)
Dimensions	Single slot module
Operating Temp	0 to 60 deg C
Power Consumption	33.6 Watts
Input Channels	8 isolated input channels
Input Voltage	100/120 VAC
Operating Voltage Range	79-132 VAC
Input Frequency	47-63 Hz
Input Delay Time OFF to ON	20 ms
Mounting Method	DIN rail or panel mount
Backplane Current	90 mA at 5.1 Volts
Power Supply Distance Rating	8
Enclosure Type	Open type
Communication Interface	Compact I/O backplane
Controller Compatibility	CompactLogix and MicroLogix 1500

EtherNet/IP and Compact I/O Architecture Compatibility

The 1769-IA8I operates as a Compact I/O expansion module within Allen-Bradley control architectures. Therefore, the module communicates through the controller backplane connection and transfers input status data to the processor memory structure. In addition, its eight-channel isolated design supports separated AC field devices where independent input reference protection is required.

The module integrates with CompactLogix systems through the 1769 backplane bus architecture. Furthermore, the Compact I/O platform supports I/O density scaling by allowing multiple discrete and analog modules to operate within the same controller assembly when system power and slot limitations are maintained.

Frequently Asked Questions

Q: How many input channels does the 1769-IA8I provide?
A: The module provides eight individually isolated AC input channels. Each channel accepts 79-132 VAC input signals.

Q: Is the 1769-IA8I compatible with MicroLogix 1500 controllers?
A: Yes. The module supports both CompactLogix controllers and MicroLogix 1500 controllers using the 1769 Compact I/O platform.

Q: What backplane current does the module require?
A: The module requires 90 mA from the 5.1 Volt backplane supply.

Field Installation Guidelines

Install the 1769-IA8I on a suitable DIN rail or panel mounting surface according to the controller system installation requirements. Verify that the power supply distance rating remains within the supported range before adding expansion modules.

Use separate wiring paths for AC field signals and low-level communication or analog signal cables. Maintain proper grounding practices for the control enclosure and connect field wiring according to the module terminal configuration.

Before operation, confirm that the connected AC input devices match the specified 79-132 VAC operating range. Check terminal tightness, insulation condition, and channel isolation requirements during commissioning.

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