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

Overview

The Allen-Bradley 1746-NI8 is an 8-channel analog input module designed for SLC 500 PLC systems. It supports both voltage and current signals, providing high-resolution analog data acquisition for industrial automation applications. Engineered for precise signal processing, this module integrates seamlessly into Compact I/O racks and delivers reliable performance in demanding environments.

Technical Specifications

• Model / Part Number: 1746-NI8

• Brand: Allen-Bradley

• Product Type: Analog Input Module, 8-Channel

• Module Type: Analog I/O for SLC 500 series

• Weight: 1.0 lbs (0.45 kg)

• Input Signal Range:

• Current: 0–20 mA, 4–20 mA, 0–1 mA, 20 mA

• Voltage: 0–5V DC, 1–5V DC, 0–10V DC, -10 to +10V DC, -20 to +20 mA

• Input Impedance: 250 Ω

• Resolution: 16-bit analog-to-digital conversion

• Update Time: 6 ms per channel

• Step Response: 0.75–730 ms

• Conversion Method: Successive approximation with switched capacitor

• Bandwidth: 1–75 Hz

• Selectable Input Filters: 1, 2, 5, 10, 20, 50, 75 Hz

• Data Format: Engineering Units scaled for PID Proportional Counts (-32,768 to +32,767)

• Backplane Current Draw: 200 mA @ 5V, 100 mA @ 24V DC

• Thermal Dissipation: 3.4 Watts

• LED Indicators: 9 green status LEDs (8 channels + module status)

• Wire Size: 14 AWG

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

Applications

• Signal monitoring and acquisition in industrial automation

• Process control with SLC 500 PLCs

• Integration with PID loops for precise control of analog devices

• Suitable for combination AC/DC I/O environments

FAQs

Q1: Which signal types are supported?
Both voltage and current inputs, including 0–20 mA, 4–20 mA, 0–10V, and 1–5V DC.

Q2: Can this module be installed in slot 0?
No, installation is allowed in any I/O slot except slot 0.

Q3: How fast does it update analog readings?
Each channel updates every 6 milliseconds for real-time control applications.