1746sc-INO4I | Allen-Bradley | SLC 500 Isolated Analog Output Module

Product Overview

The Allen-Bradley 1746sc-INO4I (developed by Spectrum Controls for the SLC 500 platform) provides four channels of high-density, fully isolated analog current output. This module converts digital processor data into precise 0-20 mA, 0-21 mA, or 4-20 mA signals to drive actuators, valves, and motor controllers. We supply this unit in 100% Brand New, original condition, offering a critical hardware lifecycle extension for existing SLC 500 architectures that require superior signal protection and high-resolution control.

Technical Specifications

Engineering Advantages

• True Channel-to-Channel Isolation: The 1746sc-INO4I features 500 VAC continuous isolation between individual channels. This architecture prevents ground loop currents from circulating between different field devices, ensuring that a fault or surge on one loop does not compromise the accuracy or safety of the other three.

• High-Speed Loop Response: A rapid 1 ms step response enables real-time control for dynamic processes. This speed ensures that valves and actuators respond instantly to PID calculations, reducing oscillation and improving overall system stability.

• 16-Bit Precision Control: The high-resolution digital-to-analog conversion allows for ultra-fine adjustments in current output. This precision proves essential for chemical dosing, high-accuracy pressure regulation, and precision speed control in variable frequency drives.

• Seamless SLC 500 Integration: The module slides directly into any standard 1746 chassis slot. It utilizes standard SLC 500 programming protocols, eliminating the need for complex custom drivers while expanding the analog capabilities beyond standard non-isolated modules.

• Robust Thermal Design: Advanced circuitry limits thermal dissipation to 5 Watts. This low-heat profile protects adjacent modules in the rack and extends the mean time between failures (MTBF) even in enclosures with limited airflow.

FAQs

• How does this module differ from the standard 1746-NO4V or NO4I?

  The "sc" and "I" designations signify that this is a Spectrum Controls specialty module providing full galvanic isolation between channels. Standard Allen-Bradley NO4 modules typically share a common return, whereas the 1746sc-INO4I protects each loop independently.

• Does this unit require an external power supply?

  The module draws its operating power (120 mA @ 5V and 250 mA @ 24V) directly from the SLC 500 backplane. Ensure your chassis power supply has sufficient capacity to handle the 24V DC current draw.

• Can I mix different output ranges on the same module?

  Yes. You can configure each of the four channels independently for 0-20 mA, 4-20 mA, or 0-21 mA via the controller’s output image table, allowing you to control different types of field equipment from a single card.

• Is this a refurbished or "new-old-stock" item?

  We guarantee this 1746sc-INO4I is 100% Brand New. It arrives in its original factory packaging with all security seals intact, ensuring you receive a component with zero hours of operation.