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  SIEMENS SIMATIC S7-300 Digital Input SM 321, 6ES7 321-1BL00-0AA0, High-Performance Industrial Automation Module

  The SIEMENS S7-300 Digital Input Module SM 321, model number 6ES7 321-1BL00-0AA0, is a high-performance digital input module designed for industrial automation systems, offering precise and reliable signal processing capabilities.