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1746-NIO4I

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Allen-Bradley 1746-NIO4I combines two selectable analog inputs and two current outputs in one SLC 500 chassis slot.
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Technical specifications for 1746-NIO4I

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1746-NIO4I
  • Product Family:
    SLC 500
  • Product Type:
    4-Channel Analog Current Combination I/O Module
  • Stock:
    1
  • Input Channels:
    2 differential voltage/current inputs, selectable per channel
  • Output Channels:
    2 current outputs
  • Input Isolation:
    Inputs are not individually isolated
  • Output Isolation:
    Outputs are not individually isolated
  • Current Input Range:
    -20…+20 mA
  • Voltage Input Range:
    -10…+10 V DC
  • Current Output Range:
    0…20 mA with 5% overrange
  • Input Resolution:
    16 bit
  • Output Resolution:
    14 bit
  • Output Load Range:
    0…500 Ω
  • Output Step Response:
    2.5 ms to 95%
  • Backplane Current:
    55 mA at 5 V DC and 145 mA at 24 V DC
  • Field Wiring Isolation:
    500 V DC to backplane
  • Recommended Cable:
    Belden 8761 shielded cable or equivalent
  • Dimensions:
    3.5 × 13.0 × 14.5 cm
  • Weight:
    0.2 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 Input Selection Output Loops Installation Application
  • Two differential analog inputs and two current outputs in one SLC 500 slot
  • Each input is independently selectable for voltage or current operation
  • Four analog channels update through the SLC input and output image tables

1746-NIO4I combines analog measurement and current-loop control in one SLC 500 position, helping retrofit projects preserve rack space while supporting both sensing and actuation.

During retrofit planning, map every field circuit to the two inputs and two outputs, and confirm the required voltage or current mode for each input before moving any wiring.

Keep the original module position and SLC program unchanged until switch settings, loop power, shielding, and output-load requirements have been checked against the installed system.

Availability, condition, price, and shipping time for 1746-NIO4I are confirmed during quotation.

Allen-Bradley 1746-NIO4I Manuals, Product Family, 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.

  • Channel 0 and channel 1 use separate current/voltage switches
  • Current mode accepts the documented bipolar current range
  • Voltage mode must be selected before a voltage source is connected
  • Two current outputs provide the module’s analog command channels
  • Each loop must remain within the documented resistance range
  • Outputs return to the documented safe state when the SLC system leaves RUN mode
  • The module occupies one 1746 chassis slot
  • Analog wiring should be separated from AC and high-voltage wiring
  • Backplane loading must include both the 5 V and 24 V current requirements
  • Mixed voltage/current signal acquisition with two current control loops
  • Process monitoring and 0…20 mA actuator command in one SLC slot
  • Machine analog control where two measurements and two current outputs are required
Description
1746-NIO4I places two monitoring channels and two current-command channels in a single SLC 500 analog module.

Its input switches let a project combine supported voltage and current signals, while the output side drives two 0…20 mA loops with documented overrange.

Before replacement, match the slot, mode switches, field wiring, loop supplies, output resistance, shielding, and the saved SLC program.
Revisions

Revision Part #

Also known as

1746-NIO4I Ser A
1746-NIO4I/A, Series A, Rev A
Alternative Names
1746-NIO4I 1746 NIO4I 1746NIO4I Allen-Bradley 1746-NIO4I Allen Bradley 1746-NIO4I Rockwell Automation 1746-NIO4I SLC 500 1746-NIO4I
Technical notes
1746-NIO4I requires verified input-mode switches, loop supplies, output loads, slot placement, and wiring; a voltage source on a current-configured input can damage the module.
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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.
How does Allen-Bradley 1746-NIO4I differ from 1746-NIO4V?
1746-NIO4I provides two current outputs, while 1746-NIO4V provides two voltage outputs; both combine two selectable voltage/current inputs with two outputs.
Can Allen-Bradley 1746-NIO4I use one voltage input and one current input?
Yes. Input channels 0 and 1 have separate mode switches, so each channel can be set independently before field wiring is connected.
Does Allen-Bradley 1746-NIO4I supply loop power to an input transmitter?
No. Rockwell states that the analog module does not supply input-loop power, so a suitable external source must match the connected transmitter.
Can Allen-Bradley 1746-NIO4I be installed or removed with chassis power applied?
No. Isolate chassis and field power before installing, removing, or wiring the module; the official manual warns that energized handling can cause injury or equipment damage.
What wiring practice helps reduce noise on Allen-Bradley 1746-NIO4I?
Use the documented shielded cable, ground the shield correctly, separate analog wiring from AC and high-voltage conductors, and keep the module away from major noise sources.
What should be checked if an Allen-Bradley 1746-NIO4I current output does not operate the connected field device correctly?
Verify the selected output channel and program command, terminal assignment, loop polarity, field-device input type, complete wiring path, shield grounding, and external equipment before concluding that the module is faulty.
What should be checked before reconnecting an existing transmitter to Allen-Bradley 1746-NIO4I?
Identify whether the transmitter provides a voltage or current signal, set the channel mode switch before wiring, confirm any required external loop supply, and verify polarity and shield grounding before energizing the circuit.