Allen-Bradley 1756-IF16K ControlLogix Analog Input Module

Product Overview

The Allen-Bradley 1756-IF16K serves as a high-density analog interface for the ControlLogix platform, providing 16 precision input channels. This module specializes in converting analog signals from industrial field devices into digital data for the controller. The “K” suffix denotes a conformal coating, which adds a layer of protection against moisture, dust, and chemical contaminants. By utilizing high-speed signal processing, the module ensures that critical process variables are captured with extreme accuracy for real-time automation.

Technical Capabilities and Performance

• Manufacturer: Allen-Bradley / Rockwell Automation
• Module Type: Analog Input (Voltage/Current)
• Catalog Number: 1756-IF16K
• Input Density: 16 single-ended, 8 differential, or 4 high-speed differential channels
• Resolution: 16-bit
• Voltage Ranges: ±10.25V, 0 to 5.125V, 0 to 10.25V
• Current Range: 0 to 20.5 mA (using 249 Ω precision resistor)
• Power Dissipation: 2.3W (Voltage mode) to 3.9W (Current mode)
• Backplane Current: 150mA at 5.1V DC; 65mA at 24V DC
• Removable Terminal Blocks: 1756-TBCH or 1756-TBS6H
• Physical Dimensions: 23.3 x 18.3 x 5.3 cm
• ​ Weight: 0.35 kg

Operational Applications

Industrial engineers deploy the 1756-IF16K in environments where precision and hardware longevity are mandatory. It functions as a primary interface for temperature transmitters, pressure transducers, and flow meters in chemical processing or water treatment facilities. Because the module features conformal coating, it performs reliably in wastewater plants and oil refineries where corrosive gases often degrade standard electronics. The high-speed differential mode allows the module to handle dynamic signals required for motor monitoring and rapid valve positioning.

Core Features

• Conformal coating provides essential protection for internal circuitry in Class G3 harsh environments.
• Software-selectable input filters allow users to suppress electrical noise and signal interference.
• Digital calibration eliminates the need for manual adjustments, maintaining accuracy over the module’s lifespan.
• Real-time onboard diagnostics monitor for open-wire conditions and out-of-range signals to prevent process errors.
• The module supports “Hot-Swapping” (Removal and Insertion Under Power), which minimizes system downtime during maintenance.
• Multiple wiring configurations enable the module to adapt to various grounding and shielding requirements.