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1794-IR8

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Allen-Bradley 1794-IR8 accepts eight RTD or resistance inputs with 2-, 3-, or 4-wire connection and open-wire diagnostics in FLEX I/O.
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Technical specifications for 1794-IR8

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1794-IR8
  • Product Family:
    Flex I/O
  • Product Type:
    FLEX I/O 8-Channel RTD Input Module
  • Stock:
    1
  • Input channels:
    8 RTD or resistance channels
  • Sensor wiring:
    2-, 3-, or 4-wire RTD
  • Sensor families:
    Documented platinum, nickel, copper, and resistance ranges
  • Data:
    Scaled temperature or resistance
  • Diagnostics:
    Open-wire detection
  • Terminal bases:
    1794-TB2, TB3, TB3S, TB3T, or TB3TS
  • External supply:
    24 V DC nominal
  • Operating temperature:
    0...55 °C
  • Enclosure:
    Open style
  • Weight:
    0.144 kg
  • Estimated shipping dimensions:
    9.4 x 4.57 x 5.33 cm
  • Tariff Code:
    8537101190
  • Country of origin:
    Singapore
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Sensor Wiring Scaling Noise Control Product Applications

Features:

  • Eight resistance inputs: RTD temperature and direct resistance measurement
  • Multiple lead topologies: documented two-, three-, and four-wire connections
  • Open-wire visibility: channel diagnostics for broken sensor circuits
1794-IR8 converts resistance-based sensors, not thermocouple junction voltage, inside a FLEX I/O station.

Its measurement quality is governed by the selected curve and the way lead resistance is handled.

The channel record should identify sensor standard, wiring topology, terminal base, scaling, and traceable test results.

Apter Power can coordinate official-document review, quotation, and sourcing support for 1794-IR8.
1794-IR8 FLEX I/O 8-Channel RTD Input Module Manuals, Datasheets, Links Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Two-wire: apply the official jumper and lead arrangement for the channel.
  • Three-wire: land the compensation pair exactly as shown in the module diagram.
  • Four-wire: preserve separate source and sense conductors to the approved terminals.
  • Sensor curve: choose the exact RTD standard or resistance range.
  • Controller format: interpret the documented implied decimal and engineering units.
  • Traceable check: compare several resistance points across the operating span.
  • Routing: separate sensor cables from switching power and high-noise conductors.
  • Shielding: terminate shields according to the official grounding instructions.
  • Diagnosis: use open-wire status and resistance checks before changing filters.
  • RTD temperature points: acquire supported resistance-temperature sensors.
  • Direct resistance: measure documented resistance ranges without thermocouple compensation.
  • Distributed monitoring: collect eight low-level channels in a FLEX I/O station.
Description
1794-IR8 is an eight-channel FLEX I/O input module for resistance-temperature detectors and direct resistance measurement. It supports the documented sensor families and two-, three-, or four-wire connections through approved terminal bases.

Channel configuration on 1794-IR8 selects the sensor curve or resistance range, while the controller receives scaled measurements and diagnostic status. Open-wire information helps separate a broken sensor circuit from a real temperature change.

The accuracy of 1794-IR8 depends on matching the RTD standard, lead topology, range, scaling, and grounding to the installed sensor. Commission with a traceable resistance source and keep low-level sensor wiring separated from switching conductors.
Revisions

Revision Part #

Also known as

1794-IR8 Series A
1794-IR8/A, Series A
Alternative Names
Allen-Bradley FLEX I/O IR8 Rockwell 1794 IR8 RTD Module 1794IR8 resistance temperature input FLEX I/O eight-channel RTD
Technical notes
A plausible but biased 1794-IR8 reading often comes from the wrong RTD curve or lead-wire arrangement rather than failed calibration. Confirm the sensor standard and the selected two-, three-, or four-wire diagram, then compare several traceable resistance points across the required span before applying any software offset.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why can 1794-IR8 show a stable but incorrect temperature?
A wrong RTD standard, resistance range, lead topology, scaling interpretation, or uncompensated lead resistance can create a repeatable bias without an open-wire fault.
What should be checked when 1794-IR8 reports an extreme value on one channel?
Review open-wire status, terminal continuity, sensor resistance, range code, lead connections, and the controller data format before replacing the sensor.
How can three-wire compensation be verified on 1794-IR8?
Confirm the matching leads reach the documented terminals, then use a traceable resistance source and compare readings with the approved two- or four-wire test method.
Why might every 1794-IR8 channel become noisy after a cabinet modification?
Look for a changed shield bond, new switching conductors, altered grounding, loose base connection, power disturbance, or a filter-setting change common to the station.
When should a software offset not be applied to 1794-IR8?
Do not mask an unverified sensor curve, wiring error, lead-resistance problem, scaling mistake, or failed traceable test with an application-level correction.
Which details are needed to source 1794-IR8 correctly?
Provide complete nameplates, Series, terminal base, RTD standards, lead topology, configuration backup, condition, quantity, destination, and maintenance deadline.