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Allen-Bradley 1746-NI4 SLC 500 4-Channel Analog I/O Module

1. Product Description

The 1746-NI4 is a 4-channel analog input module from Allen-Bradley’s SLC 500 series, designed for industrial automation applications requiring precise analog signal processing. It supports both voltage and current inputs, making it versatile for monitoring sensors, transmitters, and process variables in control systems .

2. Key Features

Dual Input Modes – Supports:
- Voltage Input: ±10V DC (760kΩ impedance).
- Current Input: 4–20mA or ±20mA (250Ω impedance) .
High Resolution – 12-bit (for voltage) / 16-bit (for current) conversion for accurate signal measurement .
Fast Update Rate – 512 µs per channel (parallel processing for all 4 channels) .
Industrial Durability –
- Operating temperature: 0°C to 60°C (extended range -20°C to +70°C per some variants) .
- 500V DC isolation between field wiring and backplane .
Easy Integration – Compatible with SLC 5/03, 5/04, and 5/05 processors and programmable via RSLogix 500 .

3. Technical Specifications

Parameter	Specification
Input Channels	4 (configurable as voltage/current)
Voltage Range	±10V DC
Current Range	4–20mA / ±20mA
Resolution	12-bit (voltage) / 16-bit (current)
Isolation Voltage	500V DC (field-to-backplane)
Power Consumption	35mA @ 5V DC / 85mA @ 24V DC
Communication	SLC 500 backplane
Certifications	CE, UL, CSA, RoHS

4. Applications

Process Control – Monitoring temperature (RTDs/thermocouples via signal conditioners), pressure, flow rates .
Manufacturing Automation – Analog sensor interfacing in assembly lines, robotics .
Energy Systems – Current/voltage monitoring in power distributio.

5. Installation & Precautions

Shielded Cabling – Use Belden #8761 or equivalent to minimize noise .
Avoid Overvoltage – Do not exceed ±7.5V AC/DC (absolute max) to prevent damage .
Environmental Limits – Ensure ambient temperature stays within 0–60°C (standard) .