Rockwell / Allen-Bradley 1794-IA8 FLEX I/O 120 VAC 8 Input Module

The Allen-Bradley 1794-IA8 is a FLEX I/O discrete AC input module that integrates eight 120 VAC input points into Rockwell Automation control systems. Each channel includes electronic fuse protection rated at 0.5 A and individual LED status indicators for real-time operational feedback. Designed for industrial environments, the module delivers 5 mA typical input current at nominal voltage and provides 2500V AC isolation between module and backplane.

Technical Specifications

Input Characteristics

• Nominal input voltage: 120 VAC


• Input current: 5 mA typical at 120 VAC


• ON state voltage range: 79–132 VAC (50/60 Hz)


• OFF state voltage range: 0–20 VAC (50/60 Hz)


• Input impedance: 26 kΩ typical at 120 VAC


• Input delay ON to OFF: 8 ms typical


• Input delay OFF to ON: 30 ms typical


• Module-to-backplane isolation: 2500V AC, 1 sec.


• Backplane current draw: 100 mA typical at 5 VDC Protection & Indicators


• Electronic fuse per input: 0.5 A typical


• Individual LED status indicator per input Environmental


• Operating temperature: −20°C to 55°C (−4°F to 131°F)


• Storage temperature: −40°C to 85°C (−40°F to 185°F)


• Relative humidity: 5% to 95% non-condensing


• Vibration: 5 G @ 10–500 Hz


• Shock: 30 G @ 11 ms


• Enclosure: Open style, suitable for industrial cabinet mounting

Key Features

• Eight discrete 120 VAC input channels


• Electronic fuse overcurrent protection on each channel


• Per-channel LED status indication


• 2500V AC galvanic isolation between module and system backplane


• Compliant with 50/60 Hz AC line frequencies


• Rugged industrial environmental specifications

Compatibility & Integration The 1794-IA8 integrates with Rockwell Automation ControlLogix, MicroLogix, and SLC 500 programmable logic controllers through the FLEX I/O backplane architecture. The module operates as a discrete I/O node within distributed automation systems.