Allen-Bradley 1746-NI8 SLC 500 8-Channel High-Resolution Analog Input Module

Product Overview

The 1746-NI8 high-density analog input module expands the capabilities of the Allen-Bradley SLC 500 platform by providing eight independent, high-resolution input channels. This 100% Brand New original module interfaces with a wide variety of industrial sensors, including pressure transmitters, flow meters, and temperature transducers. It converts standard voltage and current signals into 16-bit digital values, allowing the SLC processor to execute precise PID control and complex data logging for demanding process applications.

Technical Specifications

The 1746-NI8 utilizes successive approximation and switched capacitor conversion technology to ensure high-speed signal integrity:

Engineering Advantages

• High-Density Signal Processing: The 8-channel architecture doubles the input capacity of standard 4-channel modules. This allows engineers to monitor more field devices while occupying only a single I/O slot, drastically reducing hardware costs and enclosure size.

• Precision Interference Filtering: Seven user-selectable filter frequencies (ranging from 1 Hz to 75 Hz) allow the module to reject 50/60 Hz electrical noise. This feature ensures stable data readings even in environments with heavy electromagnetic interference from motors and drives.

• Flexible Data Scaling: The module supports multiple data formats, including Engineering Units and Scaled-for-PID. This eliminates the need for complex scaling rungs in your ladder logic, saving CPU memory and decreasing scan times.

• Efficient Thermal Management: With a thermal dissipation of only 3.4 Watts, the 1746-NI8 maintains low operating temperatures within the chassis. This thermal efficiency prevents localized hotspots, extending the lifespan of adjacent SLC 500 modules.

FAQs

• Is this 1746-NI8 unit a used or refurbished part? No. We offer only 100% Brand New original Allen-Bradley stock. Every module arrives in factory-sealed packaging to guarantee authentic performance and compliance with original manufacturer specifications.

• Can I mix voltage and current inputs on the same module? Yes. You can configure each of the eight channels individually via the PLC software to accept either voltage or current signals, providing maximum flexibility for diverse sensor arrays.

• Where should I install the module in the SLC chassis? The 1746-NI8 functions in any available I/O slot of a 1746 chassis, except for Slot 0, which the CPU controller always occupies.

• Does the module require external power for the analog loops? The module draws its operating power (200 mA @ 5V and 100 mA @ 24V) directly from the SLC backplane. However, you must provide external loop power for your field transmitters if they are not self-powered.