Allen-Bradley 1771-IR RTD Input Module PLC 6-Channel Temp Sensor Card

Allen-Bradley 1771-IR RTD Input Module

The Allen-Bradley 1771-IR is a six-channel Resistance Temperature Detector (RTD) input module designed for integration with PLC-5 and 1771 Series I/O systems. This module facilitates precise temperature measurements by converting analog signals from RTDs into digital data for processing within the PLC framework.

Key Features

• Six RTD Input Channels: Accommodates up to six three-wire RTD inputs, enabling simultaneous monitoring of multiple temperature points.
• Wide Sensor Compatibility: Supports 100-ohm platinum and 10-ohm copper RTDs, as well as other sensors reporting in ohms.
• High Resolution and Accuracy: Offers a resolution of 0.1°C (0.1°F) for platinum sensors and 0.3°C (0.5°F) for copper sensors, ensuring precise temperature readings.
• Rapid Channel Update: Achieves a channel update time of 50 milliseconds for all six channels, facilitating timely data acquisition.
• Integrated Sensor Excitation: Provides a constant 1mA current for sensor excitation, eliminating the need for external power supplies.
• Robust Input Isolation: Features 1000V peak isolation between channels and between each channel and the backplane, enhancing system safety and reliability.
• Comprehensive Fault Detection: Includes open RTD detection with a response time of less than 0.5 seconds, aiding in prompt identification of sensor issues.

Technical Specifications

• Temperature Measurement Range:
  • Platinum RTDs: -200 to +870°C (-328 to 1598°F)
  • Copper RTDs: -200 to +260°C (-328 to +500°F)
• Resistance Measurement Range: 1.00 to 600.00 ohms
• Data Formats: Natural binary, BCD actual temperature, or ohm readings
• Backplane Current Consumption: 800 mA at 5V DC
• Power Dissipation: 4.75 W maximum
• Thermal Dissipation: 16.2 BTU/hr
• Signal Delays:
  • DC On-State: 10 ms
  • DC Off-State: 50 ms
  • AC On-State: 45 ms ± 15 ms
• Environmental Conditions:
  • 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

Installation and Compatibility

The 1771-IR module is compatible with various Allen-Bradley I/O chassis, including models 1771-A1B, 1771-A2B, 1771-A3B, and 1771-A4B. It utilizes the 1771-WF wiring arm for field connections and is keyed between positions 10 and 12 or between 28 and 30 to ensure correct installation.

Applications

Ideal for industrial process control, the 1771-IR module is used in applications requiring accurate temperature monitoring and control, such as manufacturing processes, HVAC systems, and other environments where precise thermal management is critical.

By integrating the Allen-Bradley 1771-IR RTD Input Module into your PLC system, you can achieve reliable and accurate temperature measurements essential for maintaining optimal process conditions.