Allen-Bradley 1794-IA8 Flex I/O Input Module

Series#: AllenBradley

Product Details

1794-IA8 Allen-Bradley FLEX I/O Input Module – 120VAC, 8 discrete inputs for reliable industrial control.
Compact modular design for high-density I/O in remote or distributed automation systems.
Built-in isolation and surge protection for robust operation in harsh electrical environments.
Hot-swappable under power with proper wiring, minimizing downtime during maintenance.
Compatible with 1794 FLEX I/O bus and all major Allen-Bradley controllers (ControlLogix, CompactLogix, SLC 500).
100% Original product. We provide efficient, traceable, and secure global shipping solutions.

Specification

The Allen-Bradley 1794-IA8 is a 120VAC input module belonging to the FLEX I/O family, designed for high-performance distributed control. This module provides 8 isolated AC inputs, each rated for 120VAC operation, making it ideal for monitoring limit switches, push buttons, proximity sensors, and other line-voltage field devices in manufacturing, process, and material handling applications. The 1794-IA8 features optical isolation between channels and the backplane, ensuring noise immunity and protecting the controller from voltage transients. With its compact footprint and easy wiring via removable terminal blocks, it integrates seamlessly into existing 1794 racks and communicates over the FLEX I/O bus to any Logix or legacy PLC platform. The module supports hot-swapping in most configurations, reducing system downtime. Below is the detailed technical specification table for the 1794-IA8.

Parameter	Specification
Product Number	1794-IA8
Module Type	FLEX I/O Discrete Input Module
Input Voltage Rating	120VAC (nominal)
Number of Inputs	8 (sink/source, isolated per channel)
Input Voltage Range	85 to 132VAC (47-63 Hz)
Input Current (per channel at 120VAC)	10 mA typical
Input Impedance	12 kΩ at 50/60 Hz
ON-State Voltage Threshold	≥ 75VAC
OFF-State Voltage Threshold	≤ 20VAC
Isolation Voltage	1500VAC (channel-to-backplane, 1 min)
Response Time (ON to OFF)	≤ 20 ms
Response Time (OFF to ON)	≤ 10 ms
Backplane Current (5V DC)	120 mA typical
Power Dissipation	3.5 W maximum
Operating Temperature Range	0 to 55 °C (32 to 131 °F)
Storage Temperature Range	-40 to 85 °C (-40 to 185 °F)
Relative Humidity	5% to 95% non-condensing
Enclosure Type	Open-style, IP20 (when installed in enclosure)
Wiring Style	Removable terminal block (3.5 mm pitch)
Module Keying	Mechanical key via 1794 bus connector
LED Indicators	1 per channel (green, ON when input active)
Approvals	UL, CSA, CE, ATEX (Zone 2), IECEx
Weight	Approx. 0.25 kg (0.55 lb)
Dimensions (H x W x D)	94 x 47 x 75 mm (3.7 x 1.85 x 2.95 in)
Compatible Backplanes	1794-TB, 1794-TB3, 1794-TB3S, 1794-TB6
Software Configuration	RSLogix 5000, Studio 5000, or RSNetWorx for FLEX I/O