Overview
The Allen-Bradley 1794-IA16 AC digital input module is a 16-point Flex I/O input card designed for distributed I/O applications in industrial automation. This module interfaces 74–132 VAC field devices and operates with a nominal 120V AC input rating. The card is modular, allowing integration with Flex I/O terminal bases and communication adapters for scalable, compact control solutions in manufacturing, process automation, and remote monitoring systems.
Key Features
- 16 Non-Isolated Input Channels: High-density input architecture reduces system footprint
- Wide AC Input Range: Operates 74–132 VAC, accommodating voltage variations in industrial environments
- DIN-Rail Mounting: Quick installation on standard DIN rails or panel surfaces
- Channel Diagnostics: Individual yellow status LEDs for real-time input monitoring and troubleshooting
- Modular Flex I/O Design: Connects to multiple terminal bases and ControlNet, Ethernet, and Remote I/O adapters for distributed architectures
- Industrial Certifications: UL listed, CE marked, and compliant with CSA, GOST, and KC standards
Technical Specifications
- Input Voltage (Nominal): 120V AC
- Input Voltage Range: 74–132V AC
- Input Current (Nominal): 12 mA @ 120V AC
- On-State Current Max: 14.81 mA
- Off-State Voltage Max: 20V AC
- Number of Channels: 16 (non-isolated)
- Response Time: 26.5 milliseconds (max)
- Input Signal Delay: 8 ms (max ON/OFF transitions)
- FlexBus Current: 20 mA
- Power Dissipation: 6.4 W @ 132V AC
- Operating Temperature: 32–131°F (0–55°C)
- Storage Temperature: −40–185°F (−40–85°C)
- Relative Humidity: 5–95% non-condensing
- Mounting: DIN rail, panel mount
- Dimensions: 3.7 × 3.7 × 2.7 inches
- Weight: 0.27 lb
- Certifications: UL, CE, CSA, GOST, KC, C-TICK
- Product Family: Flex I/O
- Isolation Voltage (Continuous): 120V AC
Typical Applications
The 1794-IA16 is widely used in:
- Motor control centers and machinery feedback sensing
- Distributed process control and remote I/O panels
- Manufacturing equipment and production lines
- In-cabinet control systems with AC signal monitoring
- Compact automation installations requiring high input channel density
Compatibility & Replacements
Compatible With
- Terminal Bases: 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK, 1794-TBN, 1794-TBN(2), 1794-TBNK
- ControlNet Adapters: 1794-ACN, 1794-ACNR, 1794-ACNR15
- Ethernet Adapters: 1794-AENT, 1794-AENTR
- Remote I/O Adapter: 1794-ASB
- Product Family: Flex I/O distributed I/O architecture
Replaces / Drop-In Replacement For
- 1794-IA16 (previous versions) — verify firmware revision with integration documentation
- Similar 16-point AC input modules in legacy Flex I/O systems — confirm terminal base compatibility before ordering
Works With
- Allen-Bradley/Rockwell Automation control systems (CompactLogix, ControlLogix via communication adapters)
- EtherNet/IP networks (via 1794-AENT or 1794-AENTR adapters)
- ControlNet networks (via 1794-ACN series adapters)
- Remote I/O configurations (via 1794-ASB Remote Terminal Adapter)
- RSLinx and RSLogix 5000 / Studio 5000 for distributed I/O configuration
- Flex I/O daisy-chaining power connections through compatible terminal bases
