1746-NO4I | Allen-Bradley SLC 500 Analog Current Output Module

Product Overview

The Allen-Bradley 1746-NO4I provides high-precision analog control for SLC 500 programmable controller systems. This module features four (4) high-resolution current output channels designed to drive proportional valves, motor speed controllers, and other actuators requiring a 0 to 20 mA signal. By converting digital processor data into stable analog currents, it enables the SLC 500 to manage complex PID loops and modulating processes. We supply this unit in 100% Brand New and Original condition, ensuring factory-calibrated accuracy for your mission-critical automation loops.

Technical Specifications

Engineering Advantages

The 1746-NO4I optimizes process control performance through several advanced technical features:

• High-Speed Signal Processing: A 512-microsecond update time paired with a 2.5-millisecond step response ensures the module reacts almost instantaneously to processor commands. This speed proves essential for high-frequency pressure or flow control applications where lag causes system instability.

• 14-Bit Precision Control: The high-resolution 14-bit converter divides the output range into 32,764 discrete steps. This granularity allows for ultra-fine adjustments to valve positions or drive speeds, significantly improving final product consistency in chemical and food processing.

• Robust Signal Isolation: Each channel features electrical isolation to prevent ground loop interference. This architecture protects the SLC 500 backplane from field transients and noise, ensuring that electrical interference at the actuator does not corrupt the controller's logic or damage internal circuitry.

• Extended Overrange Support: The module provides a 5% overrange capability, reaching up to 21 mA. This extra headroom ensures the controller can drive field devices to their absolute mechanical limits, compensating for slight resistive losses in long cable runs.

• Low Thermal Footprint: Despite managing four analog loops, the module draws minimal backplane current. Efficient power management keeps heat dissipation low within the chassis, allowing for dense module packing without exceeding cabinet temperature ratings.

FAQs

• Can the 1746-NO4I output a 4-20 mA signal? Yes. While the hardware range is 0-20 mA, you define the 4-20 mA range through your PLC ladder logic scaling. By mapping your 4 mA setpoint to the corresponding digital value (approximately 6553), you achieve standard industrial 4-20 mA control.

• How do I verify the "Brand New" status of this module? We guarantee every 1746-NO4I arrives in its original Allen-Bradley factory box with intact security seals. Every unit carries a unique GTIN (10662073735912) and serial number for full manufacturer traceability, confirming the hardware has zero field runtime.

• Does this module require an external power supply for the current loops? The 1746-NO4I draws its loop power directly from the SLC 500 backplane (195 mA @ 24V DC). You must ensure your chassis power supply (e.g., 1746-P1, P2, or P4) has sufficient 24V capacity to support all analog modules in the rack.

• What is the recommended maintenance for analog accuracy? Because we provide these units as Brand New Original stock, they carry the factory calibration. To maintain this accuracy, ensure your field wiring utilizes shielded twisted-pair cables and keep the ambient operating temperature between 0 and 60°C to prevent thermal drift.