Allen-Bradley 1794-IA8 Input Module | 8-Point

Allen-Bradley 1794-IA8 AC Input Module: Connect Your 120V AC Devices

The Allen-Bradley 1794-IA8 is an 8-point digital input module. It is part of the versatile Flex I/O system from Rockwell Automation. This module safely interfaces 120V AC field devices with your programmable logic controller. It converts high AC voltages to low-level logic signals for your control system.

Detailed Technical Specifications

• Brand & Manufacturer: Allen-Bradley by Rockwell Automation
• Full Model Number: 1794-IA8 (Check nameplate for complete suffix information)
• Product Type: Flex I/O AC Digital Input Module
• Input Signals: 8 points, non-isolated, group common
• Voltage Range: 85 – 132V AC, 47 – 63 Hz
• On-State Current: 12 mA nominal @ 120V AC
• Minimum On-State Voltage: 65V AC
• Maximum Off-State Voltage: 43V AC
• Isolation: 1500V AC (field side to bus)
• Backplane Current: 30 mA @ 5V DC
• Power Dissipation: 4.5W maximum

Hardware & Environmental Ratings

• Enclosure Type: Open-style (IP20 rating)
• 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 Immunity: 5g @ 10-500 Hz
• Shock Resistance: 30g operating, 50g non-operating
• Wire Size: Accepts 22-12 AWG stranded copper wire

Compatible Terminal Base Units

• The 1794-IA8 module requires a separate terminal base unit for installation.
• Compatible bases include: 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK, 1794-TB2, 1794-TBN, 1794-TBNK, and 1794-TBKD.
• Always confirm compatibility with your specific system layout.

Shipping, Warranty & Support

• This product includes a 12-month warranty against defects.
• We ship worldwide using reliable carriers: FedEx, UPS, and DHL.
• Tracking information is provided for every order.

Professional FAQs

• Q: Can I mix AC and DC input modules on the same Flex I/O terminal base?
  
  A: No, you must use modules with the same type of backplane interface on a single base. The terminal base must be chosen to match the specific module type.
• Q: What is the response time for the 1794-IA8 inputs?
  
  A: The filter time is approximately 8.4 ms from OFF to ON, and 26.4 ms from ON to OFF.
• Q: Do I need an external fuse for each input on this module?
  
  A: While not always required, we recommend using external fuses or circuit breakers for each input to protect the module and wiring. Follow your local electrical codes.
• Q: Is this module compatible with all Allen-Bradley PLCs?
  
  A: It requires a compatible Flex I/O adapter (e.g., for EtherNet/IP, ControlNet, DeviceNet) which then communicates with controllers like CompactLogix or ControlLogix.
• Q: How are the eight input points powered?
  
  A: All eight inputs share a common connection point. You must provide a single common wire for the entire group of inputs.

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