FLEX I/O (1794 Series) | Allen-Bradley | 1794-IA16 Flex 16 Point Digital Input Module AB

Product Description: Allen-Bradley 1794-IA16

The Allen-Bradley 1794-IA16 is a 16-channel digital input module within the FLEX I/O platform. Designed for 120V AC field signal monitoring, it allows for reliable interface with pushbuttons, limit switches, and other AC control devices. The module is ideal for distributed I/O installations requiring compact, high-density AC input in industrial environments. Inputs are arranged in two isolated groups of 8 channels, each with a shared common.

Key Features

• 16 digital input channels for 120V AC signals
• Input voltage range: 79–132V AC @ 47–63 Hz
• Channels organized into 2 isolated groups of 8 with individual commons
• Input status LED indicators for each channel
• Designed for use with FLEX I/O terminal bases and adapters
• Ideal for interfacing AC sensors and operator devices

Technical Specifications

• Input Type: AC (79–132V AC, 47–63 Hz)
• Number of Channels: 16 (2 groups of 8)
• Input Current: ~7 mA @ 120V AC
• Input Delay:
  • ON: ≤15 ms
• Isolation Voltage: 250V (field-to- backplane, and group-to-group)
• Power Dissipation: Approx. 4.5 W
• Backplane Current: 50 mA @ 5V DC
• Mounting: DIN rail via terminal base (e.g., 1794-TB3, 1794-TB3S)
• Operating Temperature: 0°C to 55°C
• Certifications: UL Listed, CE, CSA, RoHS, Class I Div 2

Application Areas

• AC signal acquisition from industrial sensors and switches
• Monitoring operator devices like pushbuttons and selector switches
• Packaging and conveyor systems using 120V AC logic
• Industrial automation panels requiring high-density AC input
• OEM machinery with standard AC control devices

Advantages

• Enables compact, high-density 120V AC signal monitoring
• Isolated channel groups improve system reliability and safety
• Compatible with widely used FLEX I/O infrastructure
• Quick diagnostics with per-channel status LEDs
• Simplifies wiring and integration in distributed control systems