Allen Bradley 1756-IR12 RTD Temperature Input Module

Product Overview

The Allen-Bradley 1756-IR12 is a 12-point RTD input module for ControlLogix systems. It measures resistance temperature detectors and resistance values with non-isolated inputs, providing accurate temperature monitoring for process and machine control applications.

Key Specs

• Inputs: 12 RTD/resistance channels, non-isolated
• Sensor types: Pt, Ni, Cu RTDs and resistance measurement
• Resolution: 16 bits
• Current draw: 150 mA @ 5.1 V DC, 40 mA @ 24 V DC
• Power dissipation: 2.56 W
• Terminal block: 1756-TBNH (20-pin screw) or 1756-TBSH (20-pin spring)
• Operating temperature: 0 to 60 °C

Why Choose This

• Dedicated RTD linearization and sensor-specific scaling
• 12 channels provide cost-effective temperature monitoring
• Open circuit and over/under range detection per channel
• Direct sensor connection without external signal conditioning

Common Questions

• Which RTD types are supported? Platinum, nickel, and copper RTDs in 2, 3, or 4-wire configurations.
• Is channel isolation provided? No, the 1756-IR12 has non-isolated inputs; use 1756-IR6I for isolated channels.
• What software is used for configuration? Studio 5000 Logix Designer with Add-on Profile support.

Mounting Steps

1. Install the module in any available 1756 chassis slot.
2. Attach the 20-pin removable terminal block.
3. Wire RTD sensors using shielded cable, grounding at one end.
4. Configure sensor type, wiring configuration, and scaling in Studio 5000.
5. Verify temperature readings against a reference standard.

Buying Advice

• Choose 1756-IR12 for general-purpose RTD monitoring with 12 channels.
• For thermocouple inputs, select the 1756-IT16 module.
• For isolated RTD channels, use the 1756-IR6I instead.