Overview
The Allen-Bradley 1771-NT1 is a high-resolution isolated analog input module engineered for precise measurement in process control and industrial temperature applications. This module accommodates eight channels for thermocouple types B, E, J, K, T, R, and S, as well as resistance signals up to ±105 mV. With its 16-bit conversion resolution and 1000V isolation between channels, the 1771-NT1 delivers the accuracy and reliability required in demanding industrial automation environments.
Key Features
- Eight (8) isolated analog input channels for thermocouple and millivolt signals
- 16-bit resolution for precise data conversion and measurement accuracy
- 1000V isolation between channels to reject noise and interference
- Cold junction compensation for automatic thermocouple temperature correction
- Self-calibration and self-diagnostics capabilities for system verification
- Selectable alarms and input detection for real-time process monitoring
- Block Transfer (BTR/BTW) instruction support for efficient data communication
- Operates in a single 1771 chassis slot without requiring external power supply
Technical Specifications
Input Channels: 8 analog inputs (thermocouple/millivolt)
Input Resolution: 16-bit
Measurement Types: Thermocouple types B, E, J, K, T, R, S; Resistance ±105 mV
Channel Isolation: 1000V between channels
Input Impedance: >10 MΩ
Overvoltage Protection: 140V AC RMS continuous
Power Supply: 5V backplane, 1A maximum backplane current
Power Dissipation: 5W @ 5V
Operating Temperature: 0 to 60°C (32 to 140°F)
Storage Temperature: -40 to 85°C (-40 to 185°F)
Relative Humidity: 5% to 95% (non-condensing)
Measurement Range: -270 to 1000°C (depending on thermocouple type)
Communication Method: Block Transfer Read/Write (BTR/BTW) instructions
Backplane Current: 1A maximum
Typical Applications
- Industrial furnace and oven temperature monitoring and control
- Process control systems requiring high-precision analog measurement
- HVAC and thermal management systems
- Chemical processing facilities with temperature-critical operations
- Food and beverage production plants requiring precise process control
- Manufacturing equipment with multi-point temperature sensing
- Quality assurance and data logging applications
Compatibility & Replacements
Compatible With
- PLC-5 processors and systems
- 1771 I/O chassis (any 1771-compatible chassis)
- Thermocouple sensors types B, E, J, K, T, R, and S
- Millivolt signal inputs (±105 mV range)
- Block Transfer instruction sets (BTR/BTW)
Replaces / Drop-In Replacement For
This module is a discontinued product as of May 2017. Verify compatibility with your system integrator before ordering for replacement applications.
Works With
- PLC-5 programming software (RSLogix 5)
- Block Transfer communication protocol
- 1771 analog data acquisition systems
- Legacy industrial automation systems using PLC-5 architecture
