The Allen-Bradley 1794-IA8 Flex I/O module converts eight AC input signals for your processor. This unit reliably monitors discrete sensors in industrial automation.
Product Procurement & Buyer Guide
The 1794-IA8 from Rockwell Automation requires a specific voltage range for operation. It accepts 85 to 132 Volts AC at frequencies between 47 and 63 Hertz. This module uses 8 non-isolated inputs for AC-powered sensing.
You must pair this module with a compatible terminal base unit. Suitable bases include the 1794-TB3, 1794-TB2, and 1794-TBN models. Each input draws a nominal current of 12 mA at 120 Volts AC. The on-state voltage must be at least 65 Volts AC to trigger.
The maximum on-state voltage for this AC module is 132 Volts AC. The off-state voltage must remain below 43 Volts AC for reliable deactivation. This module consumes only 4.5 Watts of power at its maximum rating. It draws a FlexBus current of 30 mA from the 5 Volt DC bus.
These exact specifications help engineers match the module to their field devices. Understanding the non-isolated input architecture is critical for system design. The module's filter time delays signal changes to prevent noise errors. The default filter from OFF to ON lasts 8.4 milliseconds. The filter from ON to OFF lasts 26.4 milliseconds.
Expert Technical Evaluation & Performance Review
The module offers robust environmental tolerance for industrial applications. It operates effectively within a temperature range of -20 to 55 degrees Celsius. The unit also withstands non-operating temperatures from -40 to 85 degrees Celsius. It handles relative humidity levels from 5 to 95 percent without condensation.
Physical resilience is a key feature of this industrial I/O component. The module withstands operating vibration of 5g at 10 to 500 Hertz. It also survives operating shock of 30g and non-operating shock of 50g. This durability makes it suitable for demanding machinery and plant floor environments.
The unit provides 2150 Volts DC of isolation for one second between the system and user. This isolation protects sensitive processor electronics from potential voltage spikes. The module's 8 yellow status indicators provide immediate visual feedback for each channel. This feature greatly simplifies troubleshooting and system commissioning.
Its compact dimensions of 3.7 x 2.7 x 3.7 inches save valuable panel space. The open-style enclosure carries an IP20 protection rating for indoor use. You can mount this lightweight module, weighing only 0.25 pounds, on a standard DIN rail. It accepts 22 to 12 AWG stranded copper wire for flexible field wiring.
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