AB 1746-NR4
AB 1746-NR4
AB 1746-NR4
AB 1746-NR4
AB 1746-NR4
AB 1746-NR4
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1746-NR4

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Allen-Bradley 1746-NR4 measures four RTD or resistance inputs in an SLC 500 chassis with selectable filtering and automatic channel calibration.
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Technical specifications for 1746-NR4

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1746-NR4
  • Product Family:
    SLC 500
  • Product Type:
    Four-Channel RTD/Resistance Input Module
  • Stock:
    1
  • Number of Channels:
    4
  • Supported Inputs:
    RTD and direct resistance
  • Digital Filter:
    10, 50, 60, or 250 Hz
  • Per-Channel Update Time:
    305, 65, 55, or 17 ms, according to filter selection
  • Backplane Current:
    50 mA at 5 V DC; 50 mA at 24 V DC
  • Backplane Power:
    1.5 W maximum
  • External Power:
    Not required
  • Isolation:
    500 V DC for 1 minute between inputs and chassis/backplane; no channel-to-channel isolation
  • Common-Mode Voltage:
    ±1 V maximum
  • Overload Protection:
    ±5 V DC or ±5 mA
  • Weight:
    0.3 kg
  • Tariff Code:
    9032900090
  • 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 Setup Filtering Integration Application
  • Four RTD or resistance input channels with backplane isolation
  • Selectable digital filtering for noise rejection and update-time control
  • Automatic channel calibration with supported engineering-unit and raw-data formats

1746-NR4 is an Allen-Bradley RTD/resistance input module for SLC 500 chassis.

The module converts low-level resistance measurements for the processor while supporting configurable sensor types, wiring methods, filtering, and data presentation.

Before installation or replacement, verify the RTD element, lead-wire arrangement, channel setup, terminal schedule, chassis power budget, and program scaling.

Availability, condition, price, and shipping time for 1746-NR4 are confirmed during quotation.

Allen-Bradley 1746-NR4 RTD/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 documented RTD material, temperature coefficient, or resistance range for each enabled channel
  • Match two-, three-, or four-wire termination to the installed sensor and lead arrangement
  • Use channel status words to distinguish open-circuit, overrange, and configuration conditions
  • Choose 10 Hz for strongest rejection when a slower response is acceptable
  • Use 50 or 60 Hz filtering to reject the applicable mains-frequency interference
  • Use 250 Hz filtering only when faster updating is more important than low-frequency rejection
  • Install in an SLC 500 I/O slot other than processor slot 0
  • Reserve 50 mA at 5 V DC and 50 mA at 24 V DC in the chassis power calculation
  • Maintain separation between low-level sensor wiring and noise-producing conductors
  • Multichannel platinum, nickel, copper, or nickel-iron RTD temperature measurement
  • Direct resistance measurement for compatible process and machine sensors
  • SLC 500 process monitoring where configurable filtering and sensor-fault diagnostics are required
Description
1746-NR4 is a four-channel RTD/resistance input module for the SLC 500 control platform.

Four backplane-isolated channels accept supported RTDs and direct resistance inputs, with selectable 10, 50, 60, or 250 Hz digital filtering, automatic calibration, and multiple engineering-unit or raw-data formats.

Before installation or replacement, confirm sensor type, two-, three-, or four-wire termination, channel filter, data format, chassis slot, wiring arm, and the available 5 V and 24 V backplane current.
Revisions

Revision Part #

Also known as

1746-NR4 Ser A
1746-NR4/A, Series A, Rev A
1746-NR4 Ser B
1746-NR4/B, Series B, Rev B
Alternative Names
1746-NR4 1746NR4 AB 1746-NR4 Allen-Bradley 1746-NR4 Rockwell Automation 1746-NR4
Technical notes
1746-NR4 uses four backplane-isolated channels but no channel-to-channel isolation; verify sensor wiring, input type, filter, and data format before replacement.
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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.
Which field sensors are appropriate for 1746-NR4?
Use an RTD or resistance device covered by the module’s published input tables, then match the channel configuration to the sensor material, temperature coefficient, and wiring method.
How should lead resistance be handled on 1746-NR4?
Use the documented two-, three-, or four-wire arrangement. Three- and four-wire connections compensate lead effects better when the sensor and cable installation support them.
Why can one 1746-NR4 channel update more slowly than expected?
The selected notch filter determines conversion time. A lower-frequency filter improves noise rejection but increases the per-channel update interval.
Can 1746-NR4 report values directly in engineering units?
Yes. Select a supported data format in the channel configuration rather than scaling an incompatible raw format in ladder logic.
What does a blinking channel indicator on 1746-NR4 require checking?
Review channel status words, open-sensor wiring, shorted leads, input-range selection, and whether the configured RTD type matches the installed element.
Can a potentiometer be connected to 1746-NR4?
A potentiometer can be measured as a resistance device when its range and wiring follow the official resistance-input diagrams and the channel is configured accordingly.
What must remain unchanged when replacing 1746-NR4?
Preserve the wiring-arm terminal schedule, sensor lead arrangement, channel enable states, input types, filter choices, data formats, and alarm or process scaling used by the program.

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