Overview
The Allen-Bradley 1746-NI4 is a proven 4-channel analog input module designed for the SLC 500 platform from Rockwell Automation. This four-channel module is known for its flexibility in accepting both current and voltage inputs and has been a vital component in industrial automation systems for decades. The module provides four non-isolated differential, voltage or current selectable input channels and occupies a single slot of the SLC 500 chassis, compatible with fixed or modular style hardware.
Key Features
- Four user-configurable input channels — The 1746-NI4 is a four-channel analog input module with user-selectable analog channels for voltage or current to support multiple monitoring and control applications, featuring 16-bit resolution and a removable terminal block.
- Voltage and current flexibility — Input range of -20 to +20 mA or -10 to +10V DC.
- High-resolution conversion — High-resolution conversion ensures accurate representation of analog signals, which is crucial for industries that require fine process control, such as chemical dosing or temperature regulation.
- Fast sampling performance — With a 512 µs update time and 10 Hz bandwidth, the module is optimized for slow to moderately changing process signals.
- 15-pin D-shell connector — AIFM connector of this module is 15-pin D-shell.
Technical Specifications
- Input channels: 4 analog inputs, voltage/current selectable
- Voltage input range: ±10 V DC
- Current input range: ±20 mA (nominal), ±30 mA (maximum)
- Resolution: 16-bit
- Update time: 512 microseconds
- Bandwidth: 10 Hz
- Backplane current (5V): 25 mA
- Backplane current (24V): 85 mA
- Operating temperature: 0 to 60°C (32 to 140°F)
- Connector: 15-pin D-shell
- Form factor: Single slot SLC 500 chassis module
Typical Applications
The 1746-NI4 is widely deployed in legacy SLC 500 systems for:
- Process control and monitoring requiring precise analog signal acquisition
- Temperature and pressure measurement systems
- Sensor signal conditioning and data logging
- Multi-channel analog data input for batch process control
- Retrofit and upgrade projects in existing automation systems
Compatibility & Replacements
Compatible With
- SLC 500 fixed and modular chassis (all series)
- SLC 500 processors (1747-L511, 1747-L514, 1747-L524, 1747-L531, etc.)
- Allen-Bradley RSLogix 500 programming software
- Standard 24 VDC power supply systems
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The 1746-NI4 is a common legacy module; confirm exact matching specifications with your SLC 500 installation.
Works With
- RSLogix 500 programming environment
- Allen-Bradley I/O Scanner communication
- Discrete and analog I/O systems in SLC 500 architectures
- Remote I/O racks and distributed control networks
