SIEMENS 6ES7321-1BL00-0AA0

Siemens SIMATIC S7-300 Digital Input Module SM321 Description The Siemens 6ES7321-1BL00-0AA0, also known as SM321, is a digital input module for the SIMATIC S7-300 PLC series. It features 32 optically isolated inputs designed for 24V DC operation. This module is ideal for acquiring binary control signals from sensors and switches in a wide range of industrial automation applications. Its proven reliability makes it a valuable component for maintaining and extending existing S7-300 control systems. Order now from profideals for expert support and fast delivery. Specifications Manufacturer: Siemens Product Series: SIMATIC S7-300 Module Type: Digital Input Module SM321 Part Number: 6ES7321-1BL00-0AA0 Number of Inputs: 32 Input Voltage: 24V DC Isolation: Optically Isolated Required Front Connector: 40-pin Label Info Model: 1P 6ES7 321-1BL00-0AA0 Serial Number: S C_LO473830 Hardware Revision (E-Stand): 01 Application This module is used in various industries including manufacturing, automotive, logistics, and process control for tasks such as machine control, signal monitoring, and interlocking safety functions within an S7-300 based system. Country of Origin Made in Germany. CO2 Impact By purchasing this pre-owned module, you contribute to the circular economy and prevent the emission of approximately 10 kg of CO2, which would have been generated during the production of a new unit. This is equivalent to the CO2 absorption of a mature tree over a full year. Availability This product is a readily available spare part for the phased-out S7-300 series. While no longer in active production, it is essential for the maintenance of existing installations. FAQ What front connector is required for this S7-300 module?This module requires a 40-pin front connector. The Siemens part number for a compatible screw-type connector is 6ES7392-1AM00-0AA0. Is this module compatible with a SIMATIC S7-400 system?No, this module is specifically designed for the SIMATIC S7-300 system or the ET 200M distributed I/O system, which uses S7-300 series modules. It is not compatible with the S7-400 backplane. What is the significance of “E-Stand: 01″ on the label?”E-Stand” refers to the hardware revision or engineering status of the module. E-Stand 01 indicates it is an early production version. While fully functional, later revisions may have had minor hardware updates or component changes. 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. Last Update: Friday, March 13, 2026