Overview
The Allen-Bradley 1746-NI4 is a high-resolution analog input module designed for SLC 500 control platforms. This SLC 500 Analog I/O Module has four inputs and is a non-isolated differential input module. The module occupies a single slot of the SLC 500 chassis and is compatible with fixed or modular style hardware. The 1746-NI4 delivers precision analog signal acquisition for process control, monitoring, and instrumentation applications in manufacturing, chemical processing, and industrial automation.
Key Features
- Four non-isolated differential, voltage or current selectable input channels
- 16-bit resolution with a removable terminal block for analog input connections
- 10 Hz bandwidth with 512 microsecond update time optimized for slow to moderately changing process signals
- Delta-Sigma Modulation converts analog signals with high accuracy
- Built-in LED indicators for each channel and overall module status provide quick diagnostics
Technical Specifications
- Analog Input Channels: 4 differential, selectable per channel
- Voltage Input Range: ±10 Volts DC -1 LSB
- Voltage Input Impedance: 1 mega Ohm
- Voltage Resolution: 305.176 µV per LSB
- Voltage Accuracy at 25°C: ±0.284% of full scale
- Current Input Range (Nominal): ±20 mA
- Current Input Range (Maximum): ±30 mA
- Current Input Impedance: 250 Ohms
- Current Resolution: 1.22070 µA per LSB
- Current Accuracy at 25°C: ±0.365% of full scale
- Backplane Current (5V): 25 mA
- Backplane Current (24V): 85 mA
- Connector Type: 15-pin D-shell AIFM connector
- Module Mounting: Single slot mounting
- Bandwidth: 10 Hertz
Typical Applications
- Temperature monitoring and control in process heating/cooling systems
- Pressure and flow measurement in fluid handling applications
- 4-20 mA transmitter signal conditioning and acquisition
- Multi-signal data logging for legacy SLC 500 systems
- Sensor interface module for PLC-based monitoring networks
Compatibility & Replacements
Compatible With
- SLC 500 fixed-style controllers (SLC-5/01, SLC-5/02, SLC-5/03)
- SLC 500 modular-style controllers with 1746-A series power supplies
- SLC 500 single-slot I/O chassis configurations
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. Do not assume interchangeability without confirming slot compatibility and controller firmware support.
Works With
- RSLogix 500 programming software (ladder logic configuration)
- SLC 500 analog input scaling functions
- Delta-Sigma modulation data conversion (native module architecture)
- Standard SLC 500 I/O synchronization and addressing
