Allen-Bradley 1756-IR6I | 6-Channel Temperature Analog Module

Overview

The 1756-IR6I is a six-channel temperature-measuring analog module designed for Allen-Bradley ControlLogix systems. Each input is individually isolated, enabling precise and stable RTD measurements. This module supports high-resolution signal acquisition with advanced Sigma-Delta conversion and ensures long-term reliability under industrial environmental conditions.

Technical Specifications

• Manufacturer: Allen-Bradley

• Model / Part Number: 1756-IR6I

• Module Type: Temperature-Measuring Analog Input Module

• Input Channels: 6 individually isolated RTD inputs

• Input Range:

• 1.87 Ω, 2.000 Ω, 4.000 Ω, 8.000 Ω

• Resolution: 16-bit

• 1.87 Ω: 7.7 mΩ/bit

• 2.000 Ω: 15 mΩ/bit

• 4.000 Ω: 30 mΩ/bit

• 8.020 Ω: 60 mΩ/bit

• Current Draw: 250 mA @ 5.1V, 125 mA @ 24V

• Backplane Power: 4.25 W

• Power Dissipation: 4.3 W max, Thermal dissipation 14.66 BTU/hr

• Channel Bandwidth: 15 Hz

• Settling Time: <80 ms to 5% full scale

• Calibrated Accuracy (@ 25 °C): Better than 0.1% of range

• Calibration Interval: 6 months

• Offset Drift: 10 mΩ/°C

• Gain Drift: Nominal 50 ppm/°C, Maximum 90 ppm/°C

• Module Error: 0.54% of range

• Module Scan Time:

• 25 ms minimum (floating point, ohms)

• 50 ms minimum (floating point, temperature)

• 10 ms minimum (integer, ohms)

• Data Format: Integer mode (left justified, 2’s complement) and IEEE 32-bit floating point

• Conversion Method: Sigma-Delta

• Isolation Voltage: 50 V continuous, tested 1350 V AC for 2 s

• Module Keying: Electronic, software configurable

• RTB Keying: User-defined mechanical

• Slot Width: 1

• Temperature Codes: North American T4A, IEC T4

• Enclosure: Open-style

Application Notes

• Designed for precise temperature measurement using RTD sensors

• Compatible with Allen-Bradley ControlLogix systems

• Ideal for process control, environmental monitoring, and industrial automation requiring high-resolution analog inputs

FAQ

Q: How many channels does the 1756-IR6I support?
A: Six individually isolated RTD inputs.

Q: What is the calibrated accuracy?
A: Better than 0.1% of full scale at 25 °C.

Q: Is the module isolated?
A: Yes, each input is isolated from the backplane and from other channels.