AC Digital Input Module Allen-Bradley 1794-IA8 - 8 Inputs

Product Overview

The 1794-IA8 is an AC digital input module from Allen-Bradley. It belongs to the Flex I/O 1794 series. This module has 8 non-isolated inputs. It converts AC signals to logic levels for a processor. The module uses 120 Volts AC nominal voltage. It comes with 8 yellow status indicators. The open-style enclosure has an IP20 rating. You can mount it on a DIN rail. Dimensions are 3.7 x 2.7 x 3.7 inches. The module supports 22 to 12 AWG stranded copper wire. It works with various terminal base units like 1794-TB3K, 1794-TBN, and others.

Application Scenarios

This module fits into many industrial automation tasks. Use it for monitoring AC signals from switches, sensors, or relays. It works well in manufacturing lines, conveyor systems, and packaging machines. The 1794-IA8 integrates with Rockwell ControlLogix or CompactLogix platforms. It also connects via DeviceNet, ControlNet, Profibus DP, or EtherNet/IP. You can use it in harsh environments with -20 to 55°C operating range.

Technical Specifications

The module operates at 85 to 132 Volts AC, 47 to 63 Hz. Minimum on-state voltage is 65V AC. Maximum on-state voltage is 132V AC. On-state current ranges from 7.1 mA to 14.32 mA. Off-state voltage maximum is 43V AC. Off-state current minimum is 2.9 mA. Nominal input current is 12 mA at 120V AC. FlexBus current draws 30 mA at 5V DC. Power dissipation is 4.5W max at 132V AC. Thermal dissipation is 15.3 BTU/hour. Isolation voltage is 2150V DC for 1 second between system and user. Filter time from OFF to ON is 8.4 ms. Filter time from ON to OFF is 26.4 ms. Relative humidity range is 5 to 95% non-condensing. Operating shock is 30g; non-operating shock is 50g. Vibration tolerance is 5g at 10 to 500 Hz.

Installation & Maintenance Guide

Mount the module on a DIN rail. First attach a compatible terminal base unit. Then slide the module onto the base. Ensure the FlexBus connector engages properly. Use 22 to 12 AWG stranded copper wire. Tighten screw terminals to 0.56-0.79 Nm. The module has 8 key switch positions for alignment. For daisy-chaining, use terminals C-34 (+) and B-16 (-) for supply in. Use C-51 (+) and B-33 (-) for supply out. No periodic maintenance is required. Keep the enclosure clean and free from debris.

Packing List

The package contains one 1794-IA8 module and a user manual. No additional hardware is included. The module is shipped in an anti-static bag.