SIEMENS 6ES7321-1BH02-0AA0 SM 321

Siemens SIMATIC S7-300 16-Channel Digital Input Module Description This is the Siemens SM 321 digital input module, part number 6ES7 321-1BH02-0AA0, for the SIMATIC S7-300 PLC system. It provides 16 optically isolated inputs for 24V DC signals, ensuring reliable and safe signal acquisition from various field devices like sensors and switches. It is a fundamental component for expanding the capabilities of your automation projects. Specifications Manufacturer: Siemens Product Line: SIMATIC S7-300 Model: SM 321 Part Number: 6ES7 321-1BH02-0AA0 Number of Digital Inputs: 16 Input Voltage: 24V DC Isolation: Optically Isolated Connector: 1x 20-pole Label Info E-Stand: 3 Serial Number: S C-S8F60196 Application Designed for use in the SIMATIC S7-300 and ET 200M automation systems. Ideal for applications requiring the acquisition of digital control signals in manufacturing, process control, and machine building. Country of Origin Made in Germany. CO2 Impact By purchasing this pre-owned module, you help avoid the emission of approximately 8 kg of CO2 associated with the production of a new one. This saving is comparable to the emissions of a 40 km car journey. Availability This is an obsolete item but is available from our stock. Order now from profideals for expert support and fast delivery. FAQ Is this module compatible with an S7-400 system?Yes, the S7-300 I/O modules, including the 6ES7 321-1BH02-0AA0, can be used as distributed I/O on an S7-400 system using an ET 200M interface module (e.g., IM 153). What is the input delay for this module?The standard input delay for the 6ES7 321-1BH02-0AA0 is typically 1.2 to 4.8 ms, which is configurable in the hardware settings of your programming software (e.g., SIMATIC Manager or TIA Portal). Can this module be used in safety-related applications?No, this is a standard digital input module. For safety-related applications, you must use Siemens F-series (Failsafe) modules, which are specifically designed and certified for that purpose. 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