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      Siemens 6ES7421-1FH00-0AA0
      · Product image is representative; revision or series may vary. Contact us to request a specific version.
      Ships by Sunday, November 15

      6ES7421-1FH00-0AA0

      SM 421 16-Channel Digital Input Module

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          PRODUCT DESCRIPTION

          6ES7421-1FH00-0AA0 SM 421 16-Channel Digital Input Module

          Siemens 6ES7421-1FH00-0AA0 is the SM 421 16-Channel Digital Input Module for SIMATIC S7-400. The SM 421 receives isolated AC or DC discrete signals in the S7-400 rack.

          Isolated digital inputs is specified as 16. The published data also lists 120/230 V UC for nominal input voltage and 79–264 V AC for logic 1 ac input.
          BEFORE YOU BUY

          Confirm the complete 6ES7421-1FH00-0AA0 identity

          Send a label photo for review >>
          ACTUAL APPLICATIONS

          Application fields for 6ES7421-1FH00-0AA0

          These broad application fields reflect the documented function and technical characteristics of 6ES7421-1FH00-0AA0.
          • 01 · METALS & MINING

            Metallurgy and Mineral Processing

            Bulk material and process monitoringThermal processing and materials handling
          • 02 · WATER & WASTEWATER

            Municipal and Industrial Water Treatment

            Water quality and treatment monitoringWater flow and treatment regulation
          • 03 · INDUSTRIAL MANUFACTURING

            Discrete Manufacturing and Industrial Assembly

            Sequential control and process supervisionIndustrial process regulation and supervision

          Technical specifications for 6ES7421-1FH00-0AA0

          • Product Model
            6ES7421-1FH00-0AA0
          • Product Parameters
            SM 421 16-Channel Digital Input Module
          • In stock
            6 units
          • Manufacturer
            Siemens
          • Isolated digital inputs
            16
          • Nominal input voltage
            120/230 V UC
          • Logic 1 AC input
            79–264 V AC
          • Logic 1 DC input
            80–264 V DC
          • Logic 0 voltage
            0–48 V UC
          • Input frequency
            47–63 Hz
          • Input delay
            5–25 ms
          • Channel isolation grouping
            4 channels
          • Maximum backplane current
            100 mA
          • Typical power loss
            3.5 W
          View all additional
          Ask for Quote

          Alternative Names

          6ES74211FH000AA0 6ES7421-1FH00-0AA0 SM 421 16-Channel Digital Input Module SIMATIC S7-400 6ES7421-1FH00-0AA0
          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
          SYSTEM INTEGRATION

          Integrate 6ES7421-1FH00-0AA0 within SIMATIC S7-400

          The SM 421 receives isolated AC or DC discrete signals in the S7-400 rack. Review the host documentation for the installed SIMATIC S7-400 configuration.
          Check input voltage, channel group isolation and simultaneous input limits before assigning field wiring. Compare the project settings with the corresponding product ratings.
          Use 16 and 120/230 V UC as documented reference values when reviewing the project. Verify the configured function under the site acceptance procedure.

          Features:

          • Isolated digital inputs · 16
          • Nominal input voltage · 120/230 V UC
          • SIMATIC S7-400 configuration
          Use 6ES7421-1FH00-0AA0 only within the documented SIMATIC S7-400 arrangement and applicable installation instructions.
          INTERCHANGEABILITY

          Replace 6ES7421-1FH00-0AA0 within SIMATIC S7-400

          Record the complete 6ES7421-1FH00-0AA0 order code and photograph the fitted unit. Identify the connected equipment and any separately fitted accessories.
          Match the original group wiring and verify that the status indicators agree with the input transitions.
          Record the final configuration and test the affected functions against the pre-change baseline. Resolve any unexpected indications before returning the assembly to operation.

          Features:

          • Complete 6ES7421-1FH00-0AA0 order code
          • Installed wiring and supplied scope
          • Functional verification after exchange
          Use 6ES7421-1FH00-0AA0 only within the documented SIMATIC S7-400 arrangement and applicable installation instructions.
          DOCUMENTATION STATUS

          Browse the Manuals, Datasheets, Official Documents, Links

          Important Notice: The linked files are Amikong-hosted reference documents. Match their product identity and scope to the supplied assembly, and consult the applicable manufacturer instructions before use. Accessories and additional documents are included only when expressly listed in the quotation.

          Features:

          • Exact-model technical data for 6ES7421-1FH00-0AA0
          • Document applicability checked against the complete identity
          • Directory links by subcategory and brand
          Documentation for 6ES7421-1FH00-0AA0 must match the installed product identity and supplied configuration.

          Also searched as

          6ES7461-1BA01-0AA0 6ES7416-3XR05-0AB0 6ES7407-0DA01-0AA0 6GK7443-1EX41-0XE0 6ES7971-1AA00-0AA0

          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
            Product size
            2.40 x 22.20 x 28.80 cm
            Net weight
            0.64 kg
          • 02

            Payment & customs

            Payment
            Bank transfer (T/T)
            Currencies
            USD · EUR · GBP · RMB
            Credit cards
            Not accepted
            HS reference
            8538900000
            Origin
            Germany
          • 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

          • Packing checked

            Antistatic protection

          • Tracking supplied

            Established couriers

          • Sandy Lin

            Dedicated account manager · 15+ years
          FREQUENTLY ASKED QUESTIONS

          Questions buyers ask about 6ES7421-1FH00-0AA0

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

          • How many isolated inputs are on 6ES7421-1FH00-0AA0?

            The SM 421 module has 16 isolated digital inputs.

          • What nominal field voltage is specified for 6ES7421-1FH00-0AA0?

            The nominal input rating is 120/230 V UC.

          • What AC level registers logic 1 on 6ES7421-1FH00-0AA0?

            The documented AC logic-1 range is 79–264 V AC.

          • What DC level registers logic 1 on 6ES7421-1FH00-0AA0?

            The documented DC logic-1 range is 80–264 V DC.

          • What voltage is recognized as logic 0 by 6ES7421-1FH00-0AA0?

            The documented range is 0–48 V UC.

          • How are the inputs on 6ES7421-1FH00-0AA0 isolated?

            The module groups isolation in sets of four channels.

          • What input delay should maintenance expect from 6ES7421-1FH00-0AA0?

            The documented input delay is 5–25 ms.

          • What field-side data should a distributor verify for 6ES7421-1FH00-0AA0?

            Confirm AC or DC operation and the actual field voltage. A 24 V input module is a different variant.
          READY TO VERIFY YOUR PART?

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