The Allen-Bradley 1756-IR6I, also cataloged as the 1756-IR6I Isolated RTD Input Module, operates as a dedicated hardware component for multi-channel resistance temperature detector evaluation within ControlLogix local and remote chassis systems.

Hardware Variant & Configuration Architecture

• 1756: ControlLogix chassis-based programmable automation controller system identifier.

• IR6I: Isolated resistance temperature detector (RTD) analog input topology featuring 6 channel-to-channel isolated points.

• 1756IR6I: Catalog spare part code for field replacement and system expansion.

Electrical Ratings & Operational Limits

Network Communication & Deterministic Processing

The RTD input module processes high-precision resistance measurements and broadcasts digitized temperature values across EtherNet/IP deterministic networks via the ControlLogix backplane. Independent channel isolation suppresses common-mode noise and prevents ground loops across field sensor runs. Board-level firmware flash compatibility ensures seamless integration during online controller firmware maintenance and system-wide I/O density scaling.

Fulfillment Package Contents

• 1 x Allen-Bradley 1756-IR6I Isolated RTD Input Module

Field Installation & Grounding Protocol

• Slide the module into the selected 1756 ControlLogix chassis slot until top and bottom latches snap locked.

• Attach the 20-pin Removable Terminal Block (RTB) loaded with field sensor wiring.

• Use shielded, twisted-pair cables for all RTD signal runs to minimize electromagnetic interference.

• Terminate signal shield drain wires directly at the designated enclosure earth ground terminal.

Frequently Asked Questions

• What primary sensor types are supported by the 1756-IR6I module?

  The module processes inputs from 100 ohm, 200 ohm, 500 ohm, and 1000 ohm Platinum RTD elements.

• What analog resolution does the A/D converter provide?

  The module utilizes a 16-bit analog-to-digital converter for high-resolution temperature digitizing.

• How much backplane current does the card draw at 24 VDC?

  The internal circuit draws a maximum backplane operating current of 125 mA at 24 VDC.

• What interface block is used for field signal wiring?

  Field conductors terminate into a standard 20-pin Removable Terminal Block (RTB) interface.

• Does the module feature channel-to-channel electrical isolation?

  Yes, all 6 input channels are individually isolated from each other and from the backplane.

• What is the maximum allowable power dissipation for this card?

  Thermal design limits the maximum internal power dissipation of the module to 4.3 W.

• Can this module be installed or removed under live system power?

  ControlLogix hardware supports Removal and Insertion Under Power (RIUP) without backplane disruption.

• How is field sensor wiring protected against environmental noise?

  Wiring requires shielded twisted-pair cables with drain wires bonded directly to earth ground.