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    Discontinued date: 2017-03-23
    Replacement category: Engineering Replacement

1771-IR

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Allen-Bradley 1771-IR is a six-channel RTD and resistance input module for PLC-5 and 1771 I/O temperature-measurement applications.
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Technical specifications for 1771-IR

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1771-IR
  • Product Family:
    PLC-5
  • Product Type:
    6-Channel RTD Input Module
  • Stock:
    1
  • Input Channels:
    6 RTD or resistance channels
  • Supported RTDs:
    100 Ω platinum, α = 0.00385; 10 Ω copper, α = 0.00386
  • Platinum RTD Range:
    -200 to 870°C
  • Copper RTD Range:
    -200 to 260°C
  • Resistance Range:
    1 to 600 Ω
  • Platinum RTD Resolution:
    0.1°C or 0.1°F
  • Copper RTD Resolution:
    0.3°C or 0.5°F
  • Resistance Resolution:
    10 mΩ or 30 mΩ
  • Sensor Excitation Current:
    1 mA
  • Input Isolation:
    1000 V peak channel-to-channel and channel-to-backplane for 1 second
  • Common-Mode Rejection:
    120 dB at 60 Hz, up to 1000 V peak
  • Input Impedance:
    Greater than 10 MΩ
  • Normal-Mode Rejection:
    60 dB
  • Continuous Input Overvoltage:
    120 V rms
  • Six-Channel Scan Time:
    50 ms
  • Backplane Current:
    0.85 A at 5 V DC
  • Power Dissipation:
    4.25 W maximum
  • Field-Wiring Arm:
    1771-WF
  • Keying Positions:
    10–12 and 28–30
  • Operating Temperature:
    0 to 60°C
  • Storage Temperature:
    -40 to 85°C
  • Relative Humidity:
    5 to 95%, non-condensing
  • 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 RTD Selection Wiring Practice Calibration Application
  • Accepts documented RTD and resistance inputs for PLC-5 temperature measurement
  • Uses configurable sensor type, excitation and engineering-unit conversion
  • Depends on correct RTD lead compensation, shielding and channel calibration

1771-IR is an Allen-Bradley RTD input module for measuring temperature and resistance through a 1771 I/O chassis.

Its accuracy depends on the selected RTD curve, lead-wire arrangement and channel configuration rather than the sensor resistance alone.

Preserve sensor type, wiring, scaling, alarm limits and calibration records before exchanging the module or field termination.

Availability, condition, price, and shipping time for 1771-IR are confirmed during quotation.

Allen-Bradley 1771-IR 6-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.

  • Select the documented platinum or copper RTD curve for temperature conversion
  • Use resistance mode when automatic RTD linearization is not applicable
  • Preserve the selected Celsius or Fahrenheit engineering-unit format
  • Follow the three-wire RTD diagrams to support lead-resistance compensation
  • Route shields and grounds according to the official installation instructions
  • Keep channel assignments and field-wiring-arm terminals consistent during replacement
  • Confirm the saved block-transfer configuration before calibration
  • Allow the module and sensors to reach stable operating conditions
  • Verify all channels against the application accuracy requirement after replacement
  • Platinum RTD temperature measurement
  • Copper RTD temperature measurement
  • Direct resistance-transducer acquisition
Description
1771-IR is a single-slot Allen-Bradley RTD input module that connects as many as six temperature or resistance sensors to controllers supporting the 1771 I/O structure and block-transfer communication.

The module supports 100-ohm platinum and 10-ohm copper RTDs, along with other sensor types such as 120-ohm nickel RTDs. Measurement results can be reported in degrees Celsius, degrees Fahrenheit, or ohms using BCD or binary data formats.

Software-selectable operation includes 0.1-degree or 10-milliohm resolution, automatic calibration, and open-wire detection. The module receives power from the chassis backplane and uses a 1771-WF field-wiring arm for sensor connections.

Before installation or replacement, confirm the hardware series, RTD type, sensor wiring arrangement, 1771-WF wiring arm, chassis slot and addressing, backplane capacity, grounding, measurement units, data format, and existing block-transfer configuration.
Alternative Names
1771-IR 1771 IR 1771IR Allen-Bradley 1771-IR Allen Bradley 1771-IR Rockwell Automation 1771-IR PLC-5 1771-IR
Technical notes
1771-IR replacement requires matching Series B hardware, 1771-WF arm, RTD type, three-wire routing, units, calibration, slot, and block-transfer setup; sensor mismatch can create temperature error.
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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 1771-IR replace a thermocouple input module in an existing PLC-5 rack?
No direct substitution should be assumed. RTD sensors, excitation, three-wire field connections, terminal assignments, scaling, and block-transfer configuration differ from thermocouple measurement and must be redesigned or verified.
How should an unknown field sensor be identified before connecting it to 1771-IR?
Confirm whether the device is the documented platinum RTD, copper RTD, or a resistance-only sensor from its label or calibrated resistance data; never guess the curve in software.
Which field-wiring arm is required for 1771-IR?
Rockwell Automation specifies the 1771-WF field-wiring arm. Confirm the arm, terminal assignments, chassis keying, shield routing, and lead condition before installing the replacement.
Can 1771-IR be moved to another chassis slot without changing the PLC program?
Moving it changes the rack, group, or slot relationship used by block-transfer instructions. Update the PLC addresses, verify the wiring-arm location, and restore the channel configuration before startup.
What should be saved before replacing 1771-IR?
Record the rack, group, slot, block-transfer setup, RTD type, coefficient, engineering units, scaling, calibration, and all six channel wiring assignments.
Can 1771-IR measure a resistance sensor that is not a supported RTD curve?
The manual permits other resistance devices to be measured in ohms, but automatic temperature linearization applies only to the documented platinum and copper RTD types.
Why might 1771-IR report an incorrect temperature after replacement?
Check the selected RTD type, coefficient, Celsius or Fahrenheit setting, three-wire lead arrangement, channel scaling, field-wiring arm, calibration, and restored block-transfer data.

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