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Overview
The Allen-Bradley 1746-NI4 is a 4-channel analog input module designed for the SLC 500 control platform. This module provides high-resolution differential analog input capabilities, supporting both voltage and current signal inputs across four independent channels. Although discontinued as of April 29, 2021, the 1746-NI4 remains essential for legacy SLC 500 systems requiring reliable analog data acquisition and monitoring.
Key Features
- Four Differential Analog Input Channels: Each channel is independently configurable for voltage or current inputs, providing flexible signal measurement options.
- High-Resolution Measurement: 14-bit resolution with a non-linearity specification of 0.05% of full scale ensures accurate analog signal conversion.
- Dual Input Ranges: Supports ±10 V DC or ±20 mA current signal ranges for diverse process measurement applications.
- Fast Update Rate: 512 microsecond update time with 10 Hz bandwidth optimized for slow to moderately changing process signals.
- Delta-Sigma Conversion: Advanced analog-to-digital conversion technology for high accuracy and noise immunity in industrial environments.
- Built-in Status Indicators: LED indicators on each channel and overall module status provide quick diagnostic feedback.
Technical Specifications
- Number of Input Channels: 4 differential inputs
- Input Types: Voltage (±10 V DC) or Current (±20 mA)
- Resolution: 14-bit
- Accuracy: ±0.384% of full scale (0°C to 60°C operating range)
- Non-linearity: 0.05% of full scale
- Update Time: 512 microseconds per channel
- Bandwidth: 10 Hz
- Operating Temperature Range: 0°C to 60°C (32°F to 140°F)
- Power Supply: 24 V DC (85 mA output current)
- Mounting: Single-slot installation in SLC 500 chassis
- Conversion Method: Delta-Sigma modulation
Typical Applications
The 1746-NI4 is commonly deployed in legacy industrial automation systems for:
- Temperature and pressure monitoring in process control systems
- Chemical dosing applications requiring fine-resolution analog input
- Instrumentation and data logging in manufacturing environments
- Multi-channel sensor input consolidation in modular SLC 500 systems
- Retrofit applications in systems requiring minimal control architecture changes
Compatibility & Replacements
Compatible With
- SLC 500 Fixed Controllers (1747 series)
- SLC 500 Modular Processors
- SLC 500 Chassis and I/O modules
- RSLogix 500 programming software
- Legacy automation systems utilizing SLC 500 platform
Replaces / Drop-In Replacement For
The 1746-NI4 is a direct replacement for earlier analog input modules in the SLC 500 series. For equivalent functionality in current systems, verify compatibility with your system integrator before ordering, as newer CompactLogix and ControlLogix systems may require alternative I/O modules.
Works With
- RSLogix 500 (legacy programming environment)
- SLC 500 control system architecture
- DIN-rail mounting systems with SLC 500 chassis
- Standard industrial analog sensors and transmitters
- 4–20 mA and 0–10 V analog signal standards
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