SIEMENS 6ES7321-1BL00-0AA0

Siemens SIMATIC S7-300 SM321 Digital Input Module Description The 6ES7321-1BL00-0AA0 is a SM321 digital input module for the Siemens SIMATIC S7-300 PLC system. It provides 32 optically isolated digital inputs for 24V DC signals. This module is a workhorse in industrial automation, known for its reliability and durability in demanding environments. It is an essential component for monitoring sensors, switches, and other digital field devices. Specifications Manufacturer: Siemens Product Line: SIMATIC S7-300 Module Type: SM321 Digital Input Module Part Number: 6ES7321-1BL00-0AA0 Number of Inputs: 32 Input Voltage: 24V DC Isolation: Optically Isolated Required Connector: 40-pin Label Info Order No.: 1P 6ES7 321-1BL00-0AA0 Serial No.: S C_L9403540 Hardware Version (E-Stand): 01 Application This module is ideal for expanding the I/O capability of an S7-300 controller in various applications such as manufacturing lines, process control, building automation, and material handling systems. Country of Origin Made in Germany. CO2 Impact Opting for this pre-owned module instead of a new one prevents the emission of approximately 10 kg of CO2, contributing to a more sustainable industrial sector. Availability This module is a legacy component but is available as a tested, used spare part. Order now from profideals for expert support and fast delivery. FAQ What is the required front connector for this SM 321 module?This module requires a 40-pin front connector, such as the Siemens part number 6ES7392-1AM00-0AA0, for wiring the field signals. Is this module compatible with S7-400 systems?No, this module is specifically designed for the SIMATIC S7-300 PLC series and the ET 200M distributed I/O system. It is not compatible with S7-400 central racks. What is the typical input delay for this module?The input delay for the 6ES7321-1BL00-0AA0 is configurable in the hardware settings of your STEP 7 project, typically ranging from 0.1ms to 20ms to filter out signal noise. Last Update: Friday, March 13, 2026 profideals is not an authorized distributor, reseller or representative of the products featured on this website. All product names, trademarks, brands and logos used on this site are the property of their respective owners.