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    Discontinued date: 2017-03-31
    Replacement category: Functional Replacement

1756-IR6I

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Allen-Bradley 1756-IR6I is a six-channel isolated ControlLogix analog input module for RTD temperature sensing and direct resistance measurement with configurable filtering and diagnostics.
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Technical specifications for 1756-IR6I

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-IR6I
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 6-Channel Isolated RTD and Resistance Input Module
  • Stock:
    1
  • Input channels:
    6, individually isolated
  • Input functions:
    RTD and direct resistance
  • RTD wiring:
    2-wire, 3-wire, or 4-wire
  • Resistance ranges:
    1 to 487 Ω; 2 to 1000 Ω; 4 to 2000 Ω; 8 to 4080 Ω
  • Supported RTD coefficients:
    Copper 427; Nickel 618 and 672; Platinum 385 and 3916
  • Supported nominal sensor resistances:
    10, 100, 120, 200, 500, or 1000 Ω depending on sensor type
  • Resolution:
    16 bit
  • Integer data format:
    Resistance in ohms only
  • Floating-point functions:
    Linearization, alarms, filtering, and engineering units
  • Notch filter selections:
    10, 50, 60, 100, 250, or 1000 Hz
  • Minimum sample period:
    10 to 102 ms depending on data format and notch filter
  • Open-wire detection:
    Supported
  • Process alarms:
    High-high, high, low, and low-low
  • Rate alarm:
    Supported
  • Excitation current:
    594 μA
  • Weight:
    0.3 kg
  • Tariff Code:
    8538900000
  • Country of origin:
    USA
  • 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 Match Measurement Setup Wiring Check Application
  • Accepts six isolated RTD or resistance measurement channels
  • Supports multiple RTD curves and two-, three-, or four-wire circuits
  • Provides filtering, alarms, linearization, and open-wire diagnostics in floating-point mode

1756-IR6I is configured around the sensor, not just the signal range. The correct material coefficient and nominal resistance determine the temperature conversion performed in the module.

Integer and floating-point modes have different behavior. Selecting integer format removes temperature conversion, so a replacement project should be checked before process values are accepted.

Before reconnecting field sensors, verify the RTD curve, nominal resistance, wire count, range, excitation, filter, lead compensation, RTB wiring, and stored Logix channel profile.

Availability, condition, price, and shipping time for 1756-IR6I are confirmed during quotation.

Allen-Bradley 1756-IR6I ControlLogix 6-Channel Isolated RTD and Resistance 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.

  • Select the official RTD material, coefficient, and nominal resistance
  • Configure two-, three-, or four-wire operation to match the field circuit
  • Use a direct resistance range only when the connected device requires it
  • Choose floating-point format when temperature linearization is required
  • Restore notch filter, alarms, engineering units, and lead compensation
  • Balance sample period and effective resolution against plant noise
  • Verify RTB terminals and any jumpers for the selected wire count
  • Inspect excitation and field continuity when wire-off is reported
  • Confirm shield and grounding practice before evaluating measurement error
  • Industrial RTD temperature measurement
  • Direct resistance measurement through isolated ControlLogix channels
  • Process temperature monitoring with wire-off and alarm diagnostics
Description
1756-IR6I connects six isolated RTD or resistance channels to a ControlLogix controller for temperature and resistance acquisition.

Its floating-point mode enables sensor linearization, process alarms, digital filtering, and selectable notch frequencies, while integer mode is limited to resistance values in ohms.

Replacement work should preserve sensor type, two-, three-, or four-wire circuit, range, excitation, engineering format, filter, alarms, lead compensation, RTB wiring, and the saved Logix configuration.
Revisions

Revision Part #

Also known as

1756-IR6I Ser A
1756-IR6I/A, Series A, Rev A
Alternative Names
1756-IR6I 1756-IR6I/A Allen-Bradley 1756-IR6I Allen Bradley 1756-IR6I Rockwell Automation 1756-IR6I ControlLogix RTD 1756-IR6I
Technical notes
1756-IR6I replacement requires matching RTD curve, nominal resistance, wire count, range, filter, lead compensation, and data format; an incorrect channel profile can yield plausible but wrong temperatures.
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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.
Can 1756-IR6I be used for both RTD sensors and plain resistance measurements?
Yes. The official documentation supports RTD temperature inputs and direct resistance ranges, but each channel must be configured for the connected device and wiring method.
Which RTD details determine whether 1756-IR6I fits an existing temperature loop?
Match the sensor material and coefficient, nominal resistance, two-/three-/four-wire circuit, excitation, direct-resistance or temperature range, and required lead compensation for every channel.
Why can 1756-IR6I show a stable but incorrect temperature after replacement?
A wrong sensor curve, nominal resistance, wire count, range, lead compensation, or engineering-unit setting can produce believable but incorrect values. Compare the full channel configuration.
Does integer mode on 1756-IR6I provide temperature values?
No. The official appendix states that integer mode reports resistance in ohms and does not perform temperature conversion; use floating-point mode for temperature linearization.
How should the notch filter be selected for 1756-IR6I?
Choose a setting that rejects the plant noise frequency while meeting the required sample time and resolution. Reuse the original validated setting when replacing a module.
Can a two-wire RTD be connected to 1756-IR6I without considering lead resistance?
Two-wire connections are supported, but lead resistance directly affects measurement error. Follow the official wiring and compensation guidance for the required accuracy.
What does a wire-off indication from 1756-IR6I require checking?
Inspect the RTD, terminal block, field conductors, jumpers for the selected wire mode, channel range, and excitation path before assuming the module itself has failed.