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      Siemens 6ES7421-1BL00-0AA0
      · Product image is representative; revision or series may vary. Contact us to request a specific version.
      Ships by Saturday, November 14

      6ES7421-1BL00-0AA0

      SM 421 Digital Input Module

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          PRODUCT DESCRIPTION

          Thirty-two type 2 inputs with a shared channel reference

          Siemens 6ES7421-1BL00-0AA0 is an SM 421 module with 32 digital inputs for rated 24 V DC signals. Its channels share one field reference and are isolated from the backplane. The documented type 2 input characteristic supports switches and two-wire proximity sensors.

          Green channel indicators show input status, while this version provides neither diagnostic functions nor interrupts. The signal-zero range changes from hardware version 03 onward. Confirm the actual unit revision before using that extended negative-voltage allowance; the order number alone does not establish the supplied hardware version.
          BEFORE YOU BUY

          Confirm the complete installed configuration

          Send a label photo for review >>
          ACTUAL APPLICATIONS

          Industrial Production and Service Sectors

          These industry examples describe Siemens' broader market coverage, not verified installations of this exact product. Product suitability depends on the documented configuration and engineering requirements.
          • 01 · FOOD & BEVERAGE

            Dairy, Bakery and Confectionery

            Dairy production and processing within the commercial food industry.Bakery and confectionery manufacturing across diverse consumer food categories.
          • 02 · PACKAGING

            Pharmaceutical and Non-food Packaging

            Pharmaceutical product packaging within the medicines and healthcare sector.Non-food product packaging across consumer goods and industrial markets.
          • 03 · PLASTICS PROCESSING

            Blow Molding and Thermoforming

            Blow molding within the wider plastic product manufacturing industry.Thermoforming as a manufacturing route for shaped plastic products.

          Technical specifications for 6ES7421-1BL00-0AA0

          • Product Model
            6ES7421-1BL00-0AA0
          • Spare Model
            SM421 6ES7421-1BL00-0AA0
          • Product Parameters
            SM 421 Digital Input Module
          • Manufacturer
            Siemens
          • Input count
            32 digital inputs
          • Rated input voltage
            24 V DC
          • Signal-one voltage
            11 to 30 V
          • Signal-zero voltage
            -3 to +5 V; -30 to +5 V only from hardware version 03
          • Signal-one input current
            6 to 8 mA
          • Input delay
            1.2 to 4.8 ms for both transitions
          • Input characteristic
            IEC 61131 type 2
          • Two-wire proximity sensor bias current
            Maximum 2.5 mA
          • Field isolation arrangement
            One group of 32; isolated from backplane, not channel-to-channel
          • Backplane current
            Maximum 30 mA
          • Electronic supply current from L+
            Maximum 30 mA
          • Typical module dissipation
            6 W
          • Status and diagnostics
            Green LED per channel; no interrupts or diagnostic functions
          • Signal cable limit
            600 m unshielded; 1000 m shielded
          • Simultaneously active inputs
            32
          View all additional
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          SYSTEM & REPLACEMENT CHECK

          Information needed before ordering

          Three direct checks to secure your system integration and minimize ordering risks.

          Information

          System integration Replacement check Manuals & support
          DIGITAL INPUT INTEGRATION

          Respect the common reference and revision-dependent input range

          Configure this SM 421 as a 32-channel digital input module and preserve the channel-to-address mapping used by the installed program. Its channels share one field reference rather than independent isolated returns. Compare the field supply arrangement and the source signals with the exact 1BL00 diagram before assigning the module to an existing station.
          The manufacturer specifies a type 2 input characteristic and a maximum two-wire sensor bias current of 2.5 mA. Signal-one detection uses the documented 11 to 30 V range. The wider negative signal-zero allowance belongs only to hardware version 03 or later, so it must not be assumed from the order number alone.
          Use the green channel indicators as process-status aids while keeping program-level fault handling separate. This version has no documented interrupt or diagnostic functions. The wiring design should also respect the separate electronic supply and cable-length limits, with the complete connection drawing retained for installation work by qualified personnel.

          Features:

          • Shared 32-channel field reference
          • Version-aware signal thresholds
          • Status indication without diagnostics
          The Siemens 6ES7421-1BL00-0AA0 requires the documented hardware configuration, installation conditions and interface arrangement to be verified before system integration and commissioning.
          INTERCHANGEABILITY

          Verify the complete replacement identity before commissioning

          Record the full 6ES7421-1BL00-0AA0 marking, the hardware version and the original rack slot before selecting a spare. Keep the project configuration and input address allocation with the maintenance record. A nearby order number can have different sensor characteristics even when the channel count and nominal voltage look identical.
          Inspect the front connector coding, reference connections and auxiliary supply against the original wiring diagram. Siemens gives a specific pin 3 notice when 1BL00 and 1BL01 are used interchangeably. That notice must be evaluated with the complete replacement plan; do not silently substitute the later module or erase the existing supply connection.
          Choose the operating state through the site maintenance procedure. Siemens permits RUN replacement only when the program is prepared for the resulting response; otherwise the CPU should be placed in STOP. Retain slot identification, allow the documented removal interval, and verify channel states and the diagnostic buffer after refitting.

          Features:

          • Exact order and version comparison
          • Pin 3 exchange notice
          • Controlled station recommissioning
          The Siemens 6ES7421-1BL00-0AA0 requires replacement verification based on its complete order number, installed hardware, signal configuration and project documentation.
          DOCUMENTATION STATUS

          Browse the Manuals, Datasheets, Official Documents, Links

          Important Notice: Official documents are provided through manufacturer links. Accessories, manuals, cables, calibration data, software, certificates, and other items are not included with this equipment unless listed in the stock item description.

          Features:

          • Exact-model manufacturer data and relevant original manual pages
          • Verified manufacturer product reference; separate installation document not supplied
          • Accessories and supplied documentation follow the written quotation
          Documentation for the Siemens 6ES7421-1BL00-0AA0 includes an independent technical summary and selected original manufacturer pages; check the applicable document edition against the delivered product and approved installation documentation.

          Also searched as

          6ES7901-3CB30-0XA0 6ES7972-0AC80-0XA0 6ES7417-4XL04-0AB0 6ES7153-2BA10-0XB0 6DD2920-0BB0

          Important notice

          Manuals, software, firmware, cables, calibration data and accessories are included only when listed in the quotation. AMIKON is an independent supplier and is not affiliated with or authorised by the manufacturer.
          This content has been produced using multiple sources. Takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
          BUYER INFORMATION

          Commercial terms without hidden steps

          Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.
          • 01

            Shipping & delivery

            Dispatch
            Eligible stock: same / next day
            Carriers
            DHL, FedEx or UPS
            Ship from
            Xiamen, China
            Packed size
            Confirm final packed dimensions
            Shipping weight
            Confirm final packed weight
          • 02

            Payment & customs

            Payment
            Bank transfer (T/T)
            Currencies
            USD · EUR · GBP · RMB
            Credit cards
            Not accepted
            HS reference
            8538900000
            Origin
            Confirm supplied-unit origin
          • 03

            Warranty & returns

            Warranty
            12 months from AMIKON
            Inspection
            Label, condition and packing checks
            Returns
            Prior RMA authorisation required
            Compatibility
            Confirm before order
            OEM warranty
            Does not apply
          Your written quote confirms the product identity, price, availability, lead time, warranty and shipping terms before payment.

          • Part checked

            Full suffix recorded

          • Condition checked

            Label and appearance

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          • Tracking supplied

            Established couriers

          • Sandy Lin

            Dedicated account manager · 15+ years
          FREQUENTLY ASKED QUESTIONS

          Questions buyers ask about 6ES7421-1BL00-0AA0

          Direct answers about identity, compatibility, stock, warranty, payment and shipping.

          • Is 1BL00 the same version as 1BL01?

            No. The older 1BL00 is documented with type 2 input characteristics. The neighboring 1BL01 has different sensor characteristics and a specific replacement wiring notice; a similar name does not remove that comparison.

          • Can every unit accept -30 V as a logic-zero signal?

            No. Siemens limits the extended -30 to +5 V logic-zero range to hardware version 03 and later. Earlier versions are specified at -3 to +5 V. Check the actual module version.

          • Are all 32 channels isolated from one another?

            No. The 32 inputs share one field reference. The manufacturer specifies isolation between the channel group and backplane, not individual channel isolation.

          • Does the module provide diagnostic interrupts?

            The exact 1BL00 specification lists neither interrupts nor diagnostic functions. Channel LEDs indicate status but are not a substitute for module diagnostics.

          • What should be checked with a two-wire proximity sensor?

            Check the sensor against the type 2 input characteristic, signal thresholds and maximum 2.5 mA permitted bias current. Do not apply a type 1 sensor assumption from 1BL01.

          • Why does pin 3 matter during a 1BL00/1BL01 exchange?

            The manufacturer replacement note requires pin 3 to be wired and supplied when the two versions are used interchangeably. Preserve the complete original notice and diagram rather than treating the exchange as wiring-neutral.

          • Can the module be changed without stopping production?

            The installation manual makes replacement in RUN conditional on appropriate STEP 7 program handling. If the response is uncertain, set the CPU to STOP. This is not an unconditional hot-swap promise.
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