Configured for analog temperature signal acquisition in Flex I/O industrial platforms, the Allen-Bradley 1794-IRT8 (1794-IRT8 8 Point Thermocouple RTD Module) provides direct physical and electrical execution of millivolt and resistance transformations.

Suffix Breakdown & Technical Matrix

• 1794: Designates the Allen-Bradley Flex I/O product line architecture.
• IRT: Identifies high-resolution resistance temperature detector (RTD) and thermocouple input functionality.
• 8: Specifies the inclusion of 8 independent, single-ended input channels.

Hardware Specifications

Backplane Bus and Network Determinism

The module integrates directly into the Flex I/O backplane structure, utilizing deterministic internal bus scanning mechanics to minimize latency during high-density I/O density scaling. When deployed across EtherNet/IP or ControlNet networks via compatible network adapters, the module maintains time-stamped synchronization across channels, ensuring data integrity without impacting backplane bus communication velocity.

Package Components & Kit Details

• 1 x 1794-IRT8 Flex 8 Point Thermocouple RTD Module
• 1 x Factory Technical Installation and Wiring Instructions Manual

Physical Installation Guidelines

• Module Mounting Mechanics
  • Align the module keys with the corresponding slots on the 1794 terminal base unit.
  • Press firmly downward to seat the module securely until the side latching mechanisms engage.
• Wiring and Shield Routing
  • Route all sensor signal wires clear of high-voltage AC conductors and motor drive cables.
  • Terminate the cable shield grounds directly at the terminal base chassis ground point.

Technical Support FAQ

• What is the internal backplane bus current consumption for this module?

  The hardware requires a maximum backplane current draw of 20 mA at 5 VDC.

• Does the hardware support removal and insertion under power (RIUP)?

  Yes, RIUP is permitted when operating within specified industrial terminal bases under normal conditions.

• How does the module handle a disconnected or broken sensor wire fault?

  The internal logic identifies the open-circuit state and forces the channel data to full-scale limits.

• What is the analog-to-digital converter resolution for voltage transformations?

  The module implements a 16-bit analog-to-digital conversion architecture for precision signal mapping.

• Is channel-to-channel isolation available on this particular module assembly?

  The module features block-to-backplane isolation but does not provide isolation between individual channels.

• What is the default signal input behavior for unconfigured channels?

  Unconfigured channels default to the 0 to 325 mV input mode range.

• What is the maximum allowed loop resistance for connected RTD sensors?

  The maximum loop resistance must not exceed 20 ohms to maintain specified operational accuracy.

• Are cold junction compensation sensors included embedded inside the module housing?

  Cold junction compensation is executed externally via sensors located in the compatible terminal base unit.