Overview
The Allen-Bradley 1756-IR6I is a ControlLogix analog input module designed for high-accuracy temperature measurement using Resistance Temperature Detectors (RTDs). This 6-point isolated RTD input module provides individual channel isolation, reducing noise and improving measurement accuracy in demanding industrial automation environments.
Key Features
- Six Isolated RTD Channels: Each input channel is individually isolated for improved signal integrity.
- 16-Bit Resolution: Provides scaling from 7.7 mΩ/bit to 60 mΩ/bit depending on selected input range.
- Multiple RTD Support: Compatible with Platinum (100, 200, 500, 1000 Ohm), Nickel (100, 120, 200, 500 Ohm), and Copper (10 Ohm) RTDs.
- Flexible Data Formats: Supports both integer and IEEE 32-bit floating-point data formats with on-board temperature linearization.
- Built-in Diagnostics: Channel-level diagnostics, wire-off detection, and process alarming for reliable operation.
- Fast Scan Times: Module scan time as low as 10 ms in integer mode with 25 ms resistance and 50 ms temperature scan times.
Technical Specifications
- Catalog Number: 1756-IR6I
- Module Type: ControlLogix Analog Input Module
- Input Channels: 6 individually isolated RTD inputs
- Input Ranges: 1–487 Ω, 2–1000 Ω, 4–2000 Ω, 8–4000 Ω
- Resolution: 16-bit (7.7–60 mΩ/bit depending on range)
- Data Formats: Integer or floating-point IEEE 32-bit
- Supported 2/3/4-Wire RTDs: Platinum α=385/3916, Nickel α=672/618, Copper 10 Ω
- Operating Temperature: 0°C to 60°C
- Power Supply: 5.1V or 24V (from backplane)
- Backplane Current: 250 mA @ 5.1V; 125 mA @ 24V
- Power Dissipation: 4.3 W (maximum)
- Dimensions: Approximately 5.7 × 1.4 × 5.7 inches (145 × 35 × 145 mm)
- Weight: 0.6 lbs
- Terminal Blocks: 1756-TBNH or 1756-TBSH (removable)
- Certifications: UL, CE, CSA, RoHS
Typical Applications
The 1756-IR6I is ideal for industrial processes requiring precise temperature monitoring and control:
- Process control and temperature regulation in manufacturing
- Quality assurance and batch testing with multiple temperature points
- Environmental monitoring and HVAC systems
- Food and beverage production with stringent temperature requirements
- Pharmaceutical and chemical processing
- Equipment protection and thermal supervision
Compatibility & Replacements
Compatible With
- ControlLogix 1756 chassis (all generations)
- Logix-based control systems (Studio 5000 Logix Designer)
- EtherNet/IP networks
- Rockwell Automation FactoryTalk View HMI platforms
- Add-On Profiles available for Studio 5000
Replaces / Drop-In Replacement For
The 1756-IR6I is the standard 6-point isolated RTD input module for ControlLogix. Earlier analog temperature modules lacking individual channel isolation or high-resolution capabilities can be replaced with this unit for improved accuracy and noise immunity. Verify compatibility with your system integrator before ordering if replacing legacy modules.
Works With
- Studio 5000 Logix Designer (programming and configuration)
- FactoryTalk View (monitoring and visualization)
- EtherNet/IP communication protocol
- RSLogix 5000 / CompactLogix systems (legacy compatibility)
- Allen-Bradley removable terminal blocks 1756-TBNH and 1756-TBSH
