Overview
The Allen-Bradley 1771-NR is a high-resolution isolated analog input module engineered for PLC-5 and Allen-Bradley 1771 Series I/O systems. This module provides precise analog signal acquisition with galvanic isolation, protecting your control logic from electrical noise and ground loop interference commonly found in industrial environments. The 1771-NR is ideal for temperature sensing, pressure monitoring, and other analog measurement applications requiring high fidelity and noise immunity.
Key Features
- 8 Isolated Input Channels: 8-channel input module from the PLC 5 series with all isolated channels
- 16-Bit Input Resolution: 16-bit input resolution and a 14-bit output resolution for high-accuracy analog measurement
- Isolation Protection: Designed to withstand 1000V dc continuous between input and output channels and between input and backplane connections. Modules are 100% tested at 1200V dc for 1 second
- RTD/Resistance Capable: 8 x 1-650 Ohm RTD/Resistance Inputs, Isolated
- Fast Update Time: Maximum update time is 25 milliseconds
- Low Drift Specifications: Offset Drift is ±25 mΩ/degree Celsius, the Gain Drift being ±50 ppm/degree Celsius
Technical Specifications
- Input Channels: 8-channel input module
- Input Resolution: 16-bit input resolution
- Input Range: 1-650 Ohm RTD/Resistance
- Update Time: Maximum update time is 25 milliseconds
- Backplane Current: 1.5 Amps rated backplane current
- Power Consumption: 5 Volts of 6 Watts
- Isolation Voltage: 1000V dc continuous between input and output channels and between input and backplane connections
- Operating Temperature: 32 to 140 degrees Fahrenheit (0 to 60 degrees Celsius)
- Storage Temperature: -40 to 185 degrees Fahrenheit with 5 to 95% non-condensing relative humidity
- Mounting: Rack mounted in standard 1771 I/O chassis
Typical Applications
- Temperature monitoring with RTD sensors in industrial ovens and furnaces
- Pressure and load cell measurement in process control systems
- Analog signal acquisition in legacy PLC-5 automation systems
- Isolated analog input for noise-sensitive manufacturing environments
- Sequential and regulatory control applications requiring multiple analog inputs
Compatibility & Replacements
Compatible With
- PLC 5 series controllers
- Standard 1771 I/O chassis mounting
- Allen-Bradley 1771 Series communication modules and power supplies
- 1771 local and remote adapter configurations
Replaces / Drop-In Replacement For
- Earlier versions of Allen-Bradley high-resolution analog input modules in PLC-5 systems
- Other 8-channel isolated analog input modules in 1771 chassis applications
- Legacy RTD and resistance input solutions requiring isolation
Works With
- Allen-Bradley PLC-5 programming software and environments
- 1771 I/O chassis power supplies and communication adapters
- Block Transfer (BTR) data control and configuration methods
- BDC (Binary Coded Decimal) and Natural Binary data formats
- Standard 1771-WG wiring arms and terminal strips
