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SKU: 1746-NIO4I

Allen-Bradley 1746-NIO4I SLC 500 High-Resolution Analog Combination Module

The Allen-Bradley 1746-NIO4I is a high-resolution SLC 500 combination module featuring 2 analog inputs and 2 analog outputs (4-20 mA). It provides 16-bit signal precision and robust backplane isolation, offering a compact and reliable solution for high-accuracy PID control and process monitoring in SLC-based systems.

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Product Description

The Allen-Bradley 1746-NIO4I functions as a high-performance combination I/O module designed for the SLC 500 platform. This module integrates both analog input and output capabilities into a single-slot footprint, which effectively maximizes rack space and reduces hardware costs for smaller control systems. Because the 1746-NIO4I utilizes high-resolution signal processing, it captures and generates 4-20 mA signals with extreme precision, making it suitable for demanding process loops that require fine-tuned regulation.

Furthermore, the module features four total channels: two dedicated analog inputs and two analog outputs. It provides individual channel configuration via the SLC processor’s software, allowing engineers to scale data specifically for their application needs. Since it incorporates robust galvanic isolation, the 1746-NIO4I protects the SLC backplane from external electrical noise and field-side transients. This reliability ensures that critical data from pressure transmitters or commands to control valves remain consistent even in harsh industrial environments characterized by high electromagnetic interference.

Key Technical Characteristics

  • Manufacturer: Allen-Bradley (Rockwell Automation)
  • Model Identification: 1746-NIO4I
  • Product Series: SLC 500 I/O
  • I/O Count: 4 Channels (2 Input / 2 Output)
  • Signal Range: 4 to 20 mA (Current Loop)
  • Resolution: High-resolution 16-bit conversion for precise signal handling
  • Backplane Current Draw: 55 mA at 5V DC / 145 mA at 24V DC
  • Isolation: 500V DC isolation between user I/O and backplane
  • Thermal Management: Designed for optimal performance within standard SLC 500 chassis
  • Terminal Block: Removable terminal block (1746-RT25) for simplified field wiring and maintenance

Industrial Applications

Automation specialists implement the 1746-NIO4I across various sectors to manage sophisticated feedback loops. Specifically, the module delivers value in:

  • PID Control Loops: Providing the high-speed input and output signals necessary for precise temperature and pressure regulation.
  • Flow Measurement: Interfacing with mass flow meters to monitor liquid or gas consumption in real-time.
  • Valve Actuation: Sending accurate current signals to I/P (current-to-pressure) transducers to position control valves.
  • Chemical Dosing: Managing the proportional speed of dosing pumps to ensure exact chemical ratios in water treatment or manufacturing.
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