Overview
The Allen-Bradley 1756-IR6I is a temperature-measuring analog input module designed for ControlLogix control systems. This analog module is used with Resistance-Temperature Detectors (RTD) sensors and provides six individually isolated RTD inputs with 16-bit resolution. The module delivers precise temperature measurement across multiple configurable ranges with built-in signal conditioning and fault detection.
Key Features
- Two data formats: integer mode with multiple input ranges, notch filter, and real-time sampling; floating-point mode adds temperature linearization, process alarms, rate alarms, and digital filtering
- Supports multiple sensor types including 100, 200, 500, 1000-Ohms platinum sensors (alpha = 385), 100, 200, 500, and 1000-Ohms platinum sensors (alpha = 3916), 120-Ohms nickel (alpha = 672) sensors, and 10-Ohms copper sensors
- Selectable temperature unit display: Celsius or Fahrenheit
- Under-range/over-range detection monitors if input signals fall beyond configured limits
- Real-time sampling allows multicast of data from all input channels via configurable RTS and RPI periods
- Power requirement: 250 mA at 5 VDC and 125 mA at 24 VDC
Technical Specifications
- Four configurable input ranges: 1–487 Ω, 2–1000 Ω, 4–2000 Ω, and 8–4000 Ω
- Resolution for each range: 7.7 mΩ/bit, 15 mΩ/bit, 30 mΩ/bit, and 60 mΩ/bit respectively
- Weight: 0.8910 lb
- Pin Configuration: 20-pin connector
- Certifications: CE, CSA, KC, MARINE, NRTL, RCM, UL
Typical Applications
The 1756-IR6I is ideal for industrial processes requiring accurate multi-point temperature monitoring, including HVAC systems, furnace controls, reactor temperature measurement, process heating applications, and food/beverage manufacturing. Its channel-to-channel isolation eliminates the need for external field isolating barriers in high-noise environments.
Compatibility & Replacements
The 1756-IR6I is a ControlLogix 6-point isolated RTD input module that integrates directly into ControlLogix chassis platforms. Removable terminal block housing options include 1756-TBNH or 1756-TBSH. This module is functionally distinct from the 1756-IRT8I (8-point variant) and cannot serve as a direct replacement for thermocouple-only modules. For firmware and EDS file support, consult the Rockwell Automation Technical Documentation Center.
