Allen Bradley 1746-NI4 | SLC 500 Analog Input Module

Product Description

The Allen Bradley 1746-NI4 is a four-channel analog input module designed for the SLC 500 series. It supports both current and voltage input signals, offering high-resolution conversion with delta–sigma modulation technology. With 16-bit resolution, fast update times, and reliable repeatability, this module is engineered for precise analog signal processing in industrial automation systems.

Technical Specifications

• Manufacturer: Allen Bradley

• Category: PLCs

• Product Line: SLC 500

• Part Number: 1746-NI4

• Weight: 1.00 lbs (0.45 kg)

• Module Type: Analog Input Module

• Backplane Current (5 V): 35 mA

• Backplane Current (24 VDC): 85 mA

• Input Signal Range: -20 to +20 mA or -10 to +10 VDC

• Bandwidth: 10 Hz

• Current Input Coding: -16,384 to +16,384

• Voltage Input Coding: -32,768 to +32,767

• Resolution: 16 bits

• Update Time: 512 microseconds

• Step Response: 60 milliseconds

• Conversion Type: Delta–Sigma Modulation

• Converter Resolution: 16-bit

• Repeatability: ±1 LSB

• Non-linearity: 0.01%

• Chassis Location: Any I/O slot except slot 0

• Cable Lengths Supported: 0.5, 1, 2.5, or 5.0 meters

Application Scenarios

• Designed for SLC 500 systems requiring precise analog input measurement

• Suitable for process control, monitoring, and automation environments

• Ideal for current and voltage signal acquisition with high accuracy

FAQ

Q: How many input channels does the 1746-NI4 provide?  A: It supports four analog input channels.

Q: What type of signals can be measured?  A: Both current (-20 to +20 mA) and voltage (-10 to +10 VDC) signals.

Q: What is the resolution of the converter?  A: The module provides 16-bit resolution with delta–sigma modulation.

Comparison with Similar Models

• 1746-NI4: Four-channel analog input, supports current and voltage signals

• 1746-NI8: Eight-channel analog input, higher density option

• 1746-NO4I: Four-channel analog output, designed for control applications