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        • Lifecycle status

          Active / Available from OEM
          Apter Power can supply Honeywell MLI-DN40SU for verified MasterLogic 50 base-unit requirements, with current pricing and delivery support for the requested quantity.

        MLI-DN40SU

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        1001 reviews ｜ Need a Specific Revision?
        Honeywell MLI-DN40SU is a MasterLogic 50 base module with 24 digital inputs, 16 open-collector transistor outputs and a 100-240 V AC supply.
        In Stock
        Ships by Friday, October 30
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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.
        Shipping Mode
        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.
        Parts Availability
        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 MLI-DN40SU

        • Manufacturer:
          Honeywell
        • Part Number:
          MLI-DN40SU
        • Product Family:
          Honeywell MasterLogic-50
        • Product Type:
          MasterLogic 50 PLC base module
        • Stock:
          1
        • Power supply:
          100-240 V AC
        • Digital input voltage:
          24 V DC
        • Digital input channels:
          24
        • Digital output channels:
          16
        • Output technology:
          Open-collector transistor
        • Output logic:
          Sink
        • Base-unit format:
          IEC SU base unit
        • Programming standard:
          IEC 61131-3
        • Tariff Code:
          8537101190
        • 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 I/O Data Output Wiring Compatibility Installation Check

        Product overview:

        • Integrated CPU and 100-240 V AC power supply
        • 24 24 V DC digital inputs
        • 16 sink open-collector outputs

        MLI-DN40SU combines processing, power and 40 onboard digital points in a iec su base unit.

        The integrated design supports compact stand-alone control while retaining access to compatible MasterLogic 50 expansion I/O.

        Select field protection and common wiring for the open-collector transistor output stage before commissioning.

        Honeywell MLI-DN40SU is available for quotation and technical support from Apter Power.

        Verified resources for Honeywell MLI-DN40SU:

        I/O data:

        • Digital inputs: 24 at 24 V DC
        • Digital outputs: 16
        • Output stage: Open-collector transistor, sink

        The onboard I/O allocation of MLI-DN40SU should be mapped against the application point list before replacement.

        Expansion capacity is evaluated separately from the base-unit channel count.

        Output wiring:

        • Use sink DC output wiring
        • Maintain the documented common polarity
        • Protect each field branch against overcurrent

        The open-collector outputs of MLI-DN40SU require a compatible DC load circuit and must not be treated as dry contacts.

        Verify the voltage at the output terminal and the connected device during both commanded states.

        Compatibility:

        • Match the exact MasterLogic 50 base-unit suffix
        • Confirm expansion modules and terminal allocation
        • Verify hardware, firmware and project backup

        Replacement of MLI-DN40SU requires more than matching the total channel count.

        Power class, output technology, common arrangement and retained program data must all agree with the installed system.

        Installation check:

        • Isolate power and identify every field conductor
        • Verify supply, grounding, common and terminal torque
        • Test every I/O point and controller diagnostic

        After installing MLI-DN40SU, restore the approved application and prove the controlled sequence under site procedures.

        Record the final hardware revision, measured supply and functional-test results.

        Description
        The MLI-DN40SU is a Honeywell MasterLogic 50 base module with an integrated CPU, 100-240 V AC power supply, 24 24 V DC digital inputs and 16 sink open-collector outputs. The combined base-unit design brings controller processing, power conversion and local discrete I/O into one compact PLC assembly for machine, utility and sequence-control duties.

        The MLI-DN40SU provides 40 onboard digital points before compatible expansion I/O is added. Its sink transistor stage requires the correct DC polarity, common reference and load return, with external protection sized for every channel.

        Before installing or replacing the MLI-DN40SU, confirm the complete suffix, supply class, input commons, output wiring method, expansion-module compatibility and retained application backup. Commissioning should verify terminal torque, insulation, field-power distribution, individual point operation, diagnostics and the final safe response of connected equipment.
        Alternative Names
        MLI-DN40SU MLI DN40SU MLIDN40SU Honeywell MLI-DN40SU Honeywell MLI DN40SU Honeywell MasterLogic MLI-DN40SU MLI-DN40SU PLC base module MLI-DN40SU 24 input 16 output PLC
        Technical notes
        MLI-DN40SU integrates a 100-240 V AC supply, 24 24 V DC inputs and 16 sink open-collector outputs in one Honeywell MasterLogic 50 base unit. Confirm the exact suffix, output wiring, expansion arrangement and retained project before installation.
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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
        How are the 24 digital inputs on MLI-DN40SU wired?
        Use 24 V DC field signals with the correct input common and polarity, then verify the OFF and ON thresholds at the terminal under real cable and contact conditions.
        What does the sink output logic on MLI-DN40SU require?
        The sink open-collector outputs require the documented DC polarity, common reference, load return and external overcurrent protection; do not wire them as dry relay contacts.
        How many onboard I/O points does MLI-DN40SU provide?
        It provides 24 digital inputs and 16 digital outputs, for 40 onboard points before compatible expansion I/O is counted.
        Which supply must be connected to MLI-DN40SU?
        The base unit requires 100-240 V AC. Confirm the exact nameplate, protective device, grounding and available current before energizing the PLC.
        How is the MLI-DN40SU application engineered?
        Use the Honeywell MasterLogic programming environment and IEC 61131-3 logic appropriate to the controller revision; preserve and validate the approved project backup before exchange.
        Can another MasterLogic 50 base unit directly replace MLI-DN40SU?
        Only after matching supply type, 24/16 I/O allocation, open-collector transistor output behavior, terminal layout, expansion hardware, firmware and application memory.
        What commissioning checks are required after fitting MLI-DN40SU?
        Inspect wiring and terminal torque, verify supply and commons, test every input and output under controlled conditions, review diagnostics and prove the machine sequence before return to service.
        What information is needed to quote MLI-DN40SU?
        Provide the exact MLI-DN40SU nameplate, hardware and firmware revision, required supply, I/O load details, expansion modules, quantity, destination and requested delivery date.

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