Product Summary
The 1794-IH16 digital input module from Allen-Bradley integrates seamlessly into the Flex I/O platform. It provides sixteen non-isolated sinking inputs for 125 Volt DC systems. This module carries North American Hazardous Location approval for demanding environments. Engineers trust it for reliable high-voltage DC sensing in industrial control applications.
Expert Technical Evaluation & Performance Review
High-Voltage DC Input Architecture
The 1794-IH16 module handles demanding 125 Volt DC industrial signals with precision. It accepts a nominal on-state input voltage of 125 Volts DC. The module detects signals between a minimum of 90 Volts DC and a maximum of 146 Volts DC. This wide operating range ensures reliable switching even with fluctuating power supplies. Its maximum off-state voltage sits at 20 Volts DC for clean state differentiation.
Electrical Current Specifications and Power Handling
This module draws a nominal on-state input current of just 2 mA at 125 Volts DC. The minimum on-state current required for detection is 1 mA. The maximum on-state input current reaches 3 mA for robust signal integrity. The module limits off-state leakage to a maximum of 0.8 mA. Its maximum power dissipation is 6 Watts at 146 Volts DC voltage. The thermal dissipation reaches 20.47 BTU per hour at 146 Volts DC.
Hazardous Location Certification and Safety
The 1794-IH16 carries the critical North American Hazardous Location Approval rating. This certification confirms safe operation in dangerous industrial environments. It allows deployment in areas with potentially explosive gases or dusts. This approval makes the module suitable for oil, gas, and chemical processing plants. Engineers can confidently install it in Class I, Division 2 locations.
Mechanical Dimensions and Physical Integration
The module measures 3.7 x 3.7 x 2.7 inches when installed on a terminal base. Its uninstalled dimensions are 1.8 x 3.7 x 2.1 inches for compact storage. The module mounts directly onto compatible FLEX I/O terminal bases. It requires a 1794 series base like the 1794-TB3 for operation. This design allows for dense channel packing within control panels.
Compatibility and System Integration
This digital input module works with several 1794 series terminal bases. Compatible bases include the 1794-TB3, 1794-TB3S, 1794-TB3K, and 1794-TB3SK. These bases provide the necessary backplane connection and wiring terminals. The 1794-TB3 terminal base supports daisy-chaining for supply voltage distribution. It draws 640 mA at 5VDC from the FlexBus backplane.
Signal Integrity and Sinking Configuration
All sixteen input points on this module operate as sinking inputs. They require a DC voltage source to activate the input circuit. The module does not provide channel-to-channel isolation for the inputs. This non-isolated design reduces cost and complexity for common-ground systems. It works best when all input devices share a single voltage reference.
Logistics & Standard Packaging Details
- One (1) Allen-Bradley 1794-IH16 Flex I/O Digital Input Module
- Product documentation and installation guide
- Static-safe packaging for component protection
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