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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power supports Series review, loop-condition checks, official documentation, condition verification, and quotation coordination.

        1746-NO4I

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Allen-Bradley 1746-NO4I is a four-channel SLC 500 current output module whose independent 0–20 mA loops support precise command signals for analog field devices.
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        Ships by Thursday, October 29
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
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        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 1746-NO4I

        • Manufacturer:
          Allen-Bradley
        • Part Number:
          1746-NO4I
        • Product Family:
          SLC 500
        • Product Type:
          SLC 500 Four-Channel Analog Current Output Module
        • Stock:
          1
        • Number of outputs:
          4
        • Output range:
          0…20 mA
        • Full-scale output:
          21 mA
        • Converter resolution:
          14-bit
        • Output resolution:
          2.56348 μA per LSB
        • Step response:
          2.5 ms (5…95%)
        • Load range:
          0…500 Ω
        • Backplane current:
          55 mA at 5 V DC; 195 mA at 24 V DC
        • External supply option:
          24 V DC
        • Field-to-backplane isolation:
          500 V DC continuous
        • Replacement terminal block:
          1746-RT28
        • Operating temperature:
          0…60 °C
        • Weight:
          0.2 kg
        • 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 Loop Load Match External Power Fault Diagnosis Product Applications

        Features:

        • Four current outputs: controls independent analog field loops
        • 14-bit conversion: provides defined current resolution and response
        • External supply option: can reduce 24 V DC demand on the SLC backplane
        1746-NO4I serves applications that need four current-output channels without occupying multiple SLC slots.

        Its engineering value is the combination of defined loop resolution, isolation, and a selectable power source.

        A correct replacement therefore depends on the channel scaling and supply topology as much as the catalog number.
        Apter Power can review 1746-NO4I Series identity, loop requirements, terminal hardware, condition, official records, and quotation scope.
        Allen-Bradley 1746-NO4I SLC 500 Four-Channel Analog Current Output Module Manuals,Datasheets,Link
        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.
        • Load boundary: keep every output loop within the documented resistance range
        • Command mapping: preserve the processor word and engineering-unit scaling for each channel
        • Field proof: compare a known command with measured loop current before reconnecting the final device
        • Supply source: identify whether chassis or external 24 V DC powers the output circuitry
        • Switch position: match the hardware selection to the approved panel drawing
        • Chassis impact: recalculate 24 V DC loading when the supply method changes
        • Zero-current case: separate missing commands from an open loop or absent field supply
        • Range error: compare raw output words with the configured engineering scale
        • Noise symptom: inspect shield termination and loop routing before changing program filters
        • Valve positioning: issue documented current commands to matched process actuators
        • Drive reference: provide a 0–20 mA speed or torque command where supported
        • Analog setpoint delivery: send independent current references to four compatible field devices
        Description
        Four independent current commands are provided by 1746-NO4I for an SLC 500 chassis. The module converts processor output words into 0–20 mA field signals, with a documented 21 mA full-scale value for the analog output path.

        A 14-bit R-2R converter gives 1746-NO4I a resolution of 2.56348 μA per LSB and a 2.5 ms step response. That combination supports valve positioners, drives, and other current-controlled devices when the loop load remains within the published range.

        Installation of 1746-NO4I should retain the channel map, scaling, loop supply arrangement, 1746-RT28 terminal block, and shielded field wiring. The optional external 24 V DC supply changes chassis loading, so the backplane calculation must match the actual power-switch position.
        Revisions

        Revision Part #

        Also known as

        1746-NO4I Ser A
        1746-NO4I/A, Series A, Rev A
        Get Parts Quote
        Alternative Names
        1746NO4I 1746 NO4I SLC 500 Four-Channel Current Output SLC 500 Analog Current Output Module
        Technical notes
        1746-NO4I can use either chassis 24 V DC or an external 24 V DC source; that selection changes the module's backplane demand. An incorrect power-switch position can invalidate the chassis calculation, so match the installed supply arrangement before restoring loop commands and test each channel with a known load.
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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.
        VIEW ALL FAQS
        Why can 1746-NO4I show a valid output word while the field loop remains at zero current?
        A valid processor word does not prove loop continuity. Separate an open load, missing field supply, wrong power-source switch position, and terminal wiring before changing the program.
        When should an external 24 V DC source be used with 1746-NO4I?
        Use it when the approved chassis power calculation requires the module's 24 V DC demand to be removed from the backplane. The source and hardware switch must match the panel design.
        What makes one 1746-NO4I channel reach full scale before the others?
        Start with that channel's scaling word and connected resistance. A mismatched engineering range or excessive loop load can limit the delivered current without affecting neighboring channels.
        How should a replacement 1746-NO4I be accepted before a valve is returned to automatic control?
        Drive the channel through low, midpoint, and high commands into a known load, compare measured current with the expected value, and then verify the actual valve response.
        Which records reduce wiring errors when the 1746-NO4I terminal block is moved?
        A conductor-by-conductor channel map and the documented shield/common arrangement are the most useful records. Retain the 1746-RT28 keying and loop supply identity with that map.
        Can 1746-NO4I be exchanged with a voltage-output SLC module without design changes?
        No equivalence is established. Current and voltage outputs use different field interfaces, scaling, loads, and acceptance tests, so the connected devices and project configuration require separate engineering review.

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