Overview
The Allen-Bradley 1794-IA16 is a Flex I/O 16-point digital input module designed for discrete AC signal acquisition in industrial automation systems. This non-isolated AC input module accepts input voltage from 74VAC to 132VAC with a nominal rating of 120VAC, making it suitable for standard industrial control circuits, motor interlocks, and discrete sensor interfaces. The module connects to the Flex I/O communication backbone via compatible adapters and requires a terminal base for field wiring termination.
Key Features
- 16 non-isolated AC input channels with individual status indicators
- Input voltage range: 74–132VAC (nominal 120VAC)
- Low nominal input current: 12 mA per channel
- Fast response time of 26.5 milliseconds
- Supports DIN-rail mounting via compatible terminal bases
- Compatible with Flex I/O ControlNet, Ethernet, and Remote I/O adapters
Technical Specifications
| Input Channels | 16 non-isolated discrete inputs |
| Input Voltage (Nominal) | 120VAC |
| Input Voltage Range | 74–132VAC |
| Input Current (Nominal) | 12 mA per channel |
| On-State Current | 5.49–14.81 mA |
| Off-State Current (Max) | 2.9 mA |
| Response Time | 26.5 milliseconds |
| Isolation Voltage | 120V continuous |
| Flexbus Current Draw | 20 mA |
| Power Dissipation (Max) | 6.4 W at maximum voltage |
| Operating Temperature | 0–55°C (32–131°F) |
| Storage Temperature | −40–85°C (−40–185°F) |
| Dimensions (Module) | 46 × 94 × 53 mm (1.8 × 3.7 × 2.1 in.) |
| Dimensions (Installed with Base) | 94 × 94 × 69 mm (3.7 × 3.7 × 2.7 in.) |
| Mounting Type | DIN rail (requires terminal base) |
| Certifications | UL, CE, CSA, C-TICK, KC, GOST |
Typical Applications
The 1794-IA16 is used for acquiring discrete 120VAC signals from:
- Limit switches and proximity sensors on industrial machinery
- Motor control interlocks and safety circuits
- Panel-mounted pushbuttons and selector switches
- Indicator lights and alarm feedback circuits
- Process control logic that relies on AC-powered devices
Compatibility & Replacements
The 1794-IA16 requires a compatible terminal base for wiring and installation. Approved terminal bases include the 1794-TB3, 1794-TB3S, 1794-TBN, 1794-TB3K, 1794-TB3SK, and 1794-TBNK. This module integrates with Flex I/O communication adapters such as the 1794-ACN/ACNR (ControlNet), 1794-AENT/AENTR (Ethernet), and 1794-ASB (Remote I/O). The module is part of the Bulletin 1794 Flex I/O product family and is designed for use with Flex I/O-based control architectures. For systems requiring 16-point analog inputs or alternative voltage ratings, consult the full Flex I/O product catalog.
