Overview
The Allen-Bradley 1794-IA16 is a 16-point 120V AC digital input module designed for the Flex I/O distributed I/O system. This module provides nonisolated AC input channels with an operating voltage range of 74–132V AC, making it suitable for a wide range of industrial control applications. The 1794-IA16 supports removal and insertion under power (RIUP), allowing technicians to replace modules without shutting down the system.
Key Features
- 16 discrete AC input points – each independently connected to process 120V AC signals
- Modular Flex I/O design – easily expands or reconfigures I/O without system replacement
- RIUP capability – hot-swap module insertion and removal without powering down the controller
- High input density – reduces panel footprint and cable complexity
- DIN-rail mounting – standard industrial installation, flexible panel or din-rail deployment
- Signal delay – max 8 ms on both ON-to-OFF and OFF-to-ON transitions for responsive control
Technical Specifications
- Input Voltage: 120V AC nominal (74–132V AC operating range)
- Number of Inputs: 16 discrete points
- Input Current: 2.9 mA per point (on-state max 14.81 mA, off-state max 20V AC)
- Signal Type: AC Digital (nonisolated)
- Input Signal Delay: 8 ms maximum (ON/OFF transitions)
- Operating Temperature: 0 to 55°C (32 to 131°F)
- Storage Temperature: -40 to 85°C (-40 to 185°F)
- Relative Humidity: 5 to 95% non-condensing
- Dimensions: 3.7 × 3.7 × 2.7 inches
- Mounting Type: DIN-rail or panel mount
- Terminal Connection: Screw terminal (requires terminal base)
- Certifications: UL Listed, CE Marked, CSA, GOST, KC, C-TICK
- Series: Flex I/O
- Lifecycle Status: Active Mature
Typical Applications
The 1794-IA16 is widely deployed in:
- Discrete AC sensor monitoring (limit switches, pressure sensors, proximity detectors)
- Distributed control systems where modular I/O is required
- Manufacturing and process automation with 120V AC field devices
- Machinery control requiring real-time input monitoring with minimal latency
- In-cabinet and panel-mount installations where space efficiency matters
- Systems requiring hot-swap capability for maintenance-friendly operation
Compatibility & Replacements
Compatible With
- Allen-Bradley CompactLogix and ControlLogix controllers
- Flex I/O distributed I/O networks
- 1794-TB3 and 1794-TB3S terminal bases (required for module connection)
- FLEX I/O-XT extreme environment systems (series compatibility)
- EtherNet/IP and other open networks via ControlLogix gateway
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering for specific legacy module replacements. The 1794-IA16 Series A is directly compatible with Flex I/O slots across standard ControlLogix platforms.
Works With
- Studio 5000 / RSLogix 5000 (Rockwell Automation programming environment)
- EtherNet/IP protocol
- Flex I/O communication modules
- Discrete AC signal sources (120V nominal)
- Third-party HMI and SCADA systems supporting ControlLogix networks
