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      Siemens 6ES7321-1BL00-0AA0
      Siemens 6ES7321-1BL00-0AA0

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      SIMATIC S7-300 SM 321 digital input module

      6ES7321-1BL00-0AA0

      Spare Part Number

      PN6ES7321-1BL00-0AA0

      Product Information:

      Siemens 6ES7321-1BL00-0AA0 is a SIMATIC S7-300 SM 321 isolated digital input module with 32 inputs for 24 V DC signals and one 40-pole front connector.

      The module follows IEC 61131 type 1 input characteristics, recognizes signal 1 at 13 to 30 V, draws approximately 7 mA per active input, and separates the field inputs from the backplane bus by optocoupler.

      The 32 channels are arranged in groups of 16. Confirm the permitted number of simultaneously active inputs for the mounting orientation and temperature, use the required 40-pin connector, and verify sensor wiring before installation.

      Product image is representative; revision or series may vary. Contact us to request a specific version.
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      Technical specifications for

      6ES7321-1BL00-0AA0

      0 TECHNICAL PARAMETERS
      • Manufacturer:
        Siemens
      • Product Category:
        PLC and Machine Control
      • Spare Part Number:
        6ES7321-1BL00-0AA0
      • Estimated shipping dimensions:
        4x12.5x12cm
      • Weight:
        0.26 kg
      • Tariff Code:
        853890
      • Country of origin:
        Germany
      • Place of shipment:
        Xiamen, Fujian, China
      • Module type:
        SM 321 digital input
      • Digital inputs:
        32
      • Rated input voltage:
        24 V DC
      • Signal 0 range:
        -30 to +5 V
      • Signal 1 range:
        13 to 30 V
      • Signal 1 current:
        7 mA typical
      • Input delay:
        1.2 to 4.8 ms
      • Channel grouping:
        Groups of 16
      • Isolation:
        Inputs to backplane bus by optocoupler
      • Front connector:
        40-pin
      • Shielded cable length:
        1000 m maximum
      • Unshielded cable length:
        600 m maximum
      • Stock Availability:
        38
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      Alternative Names

      6ES7321-1BL00-0AA0 6ES7321-1BH02-0AA0 6ES7321-1BH50-0AA0

      Information

      Overview Manuals Main Features Specific Application Scenarios Configuration Notes

      Features:

      • 32 isolated digital inputs
      • 24 V DC input signals
      • One 40-pin front connector
      • Maximum 1000 m shielded or 600 m unshielded signal cable

      The Siemens 6ES7321-1BL00-0AA0 is an SM 321 digital input module for acquiring 32 isolated 24 V DC signals in a SIMATIC S7-300 station. The inputs are organized in groups and transfer field-state information through the S7 backplane to the controller.

      Successful replacement requires the same rack assignment, 40-pin front connector wiring and STEP 7 hardware configuration. Field voltage, common grouping, signal polarity, cable length and sensor current must be checked before the channel group is enabled.

      The Siemens 6ES7321-1BL00-0AA0 is a cancelled spare part; 6ES7521-1BL00-0AB0 is an engineered S7-1500 migration option, not a drop-in replacement.
      Siemens 6ES7321-1BL00-0AA0 SIMATIC S7-300 SM 321 Digital Input 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.
      The 6ES7321-1BL00-0AA0 performs level detection and opto-isolation processing on external 24V DC signals through its input circuitry. When a field switch signal is turned on or off, the module's internal optocoupler converts the electrical signal into an optical signal and then back into an electrical signal, achieving electrical isolation between the control side and the field side. Subsequently, the input status is digitized and transmitted to the PLC central processing unit via the backplane bus, where the CPU performs logical operations and control decisions based on the user program.
      • Production Line Monitoring: A single module can monitor up to 32 independent field devices, such as limit switches, proximity sensors, and photoelectric sensors.
      • Packaging Machinery: Widely used to process high-speed input signals for level detection, gate position confirmation, and safety interlock monitoring.
      • Material Handling: Monitoring conveyor belts and automated sorting systems requires simultaneous reading of multiple binary signals (e.g., "Package Arrived," "Emergency Stop Activated").
      • Building Automation: Integrated into large facility management systems for controlling and monitoring lighting systems and environmental trigger signals.

      Configuration Notes:

      • Preserve the original slot assignment
      • Match 24 V DC input grouping
      • Reuse only a verified 40-pin front connector
      • Confirm STEP 7 hardware parameters

      After installation, force or simulate each field input safely and compare the module status with the controller process image.

      Manuals

      Technical notes

      Siemens 6ES7321-1BL00-0AA0 is an SM 321 spare-part digital input module with 32 isolated 24 V DC inputs, IEC 61131 type 1 characteristics and a 40-pin front connector. Inputs are grouped in 16 and isolated from the S7-300 backplane bus; the specified temperature-dependent simultaneous-input limits must be observed.
      PRODUCT & ORDER FAQS

      Questions buyers ask about 6ES7321-1BL00-0AA0

      • How can I identify 6ES7321-1BL00-0AA0?

        Verify the complete Siemens article number 6ES7321-1BL00-0AA0 on the product label and match every suffix before ordering.

      • What is compatible with 6ES7321-1BL00-0AA0?

        It fits S7-300 systems using the SM 321 32-channel input configuration and a 40-pin front connector; the I/O address and wiring must match the project.

      • Where is 6ES7321-1BL00-0AA0 applied?

        It acquires 24 V DC discrete signals from switches, sensors and contacts in SIMATIC S7-300 automation systems.

      • What should be checked before installing 6ES7321-1BL00-0AA0?

        Verify 24 V DC field supply, sensor polarity, group commons and channel addressing, then seat the required 40-pin connector with power isolated.

      • Is 6ES7321-1BL00-0AA0 available from stock?

        Availability is checked against the exact 6ES7321-1BL00-0AA0 article number, hardware condition and required configuration before quotation.

      • What warranty applies to 6ES7321-1BL00-0AA0?

        Moore Automated supplies quality-inspected Siemens parts with warranty terms confirmed on the quotation for 6ES7321-1BL00-0AA0.

      • How is 6ES7321-1BL00-0AA0 shipped?

        The confirmed 6ES7321-1BL00-0AA0 is prepared for dispatch from Xiamen, Fujian, China within 3 days and packed to protect its electronics, terminals and product label.
      All FAQ
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          • Product Lifecycle Stage

            Obsolete/Discontinued by OEM

            For a new platform, Siemens SIMATIC S7-1500 DI module 6ES7521-1BL00-0AB0 is an engineered migration option; rack, front connector, addressing and TIA Portal configuration must be redesigned.

            Moore Automated supplies high-quality Siemens 6ES7321-1BL00-0AA0 replacement modules and spare parts for verified industrial maintenance requirements.

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          Moore Disclaimer: Moore Automated's sales automation equipment and related solutions are intended for industrial automation and business operational efficiency improvement purposes only. Product information, technical parameters, and application cases are for reference only and do not constitute an absolute guarantee of performance for any specific industry, scenario, or final application. Actual equipment performance may vary depending on factors such as the usage environment, system integration method, and maintenance conditions. Users should confirm compatibility and safety based on professional technical assessments. Moore Automated assumes no liability for any direct or indirect losses caused by improper use, modification, or failure to operate according to specifications, to the extent permitted by law.

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