IO-Link - M21 modules are a range of industrial communication devices designed for seamless integration into automation systems. These modules are typically associated with brands like ifm, Balluff, or Pepperl+Fuchs, which are renowned companies in the industrial automation sector. ifm, for instance, is a German-based company, while Balluff and Pepperl+Fuchs also originate from Germany, specializing in sensor technology and industrial communication solutions. IO-Link - M21 modules serve industries such as manufacturing, automotive, and logistics, enabling smart sensor and actuator connectivity. Their primary products include IO-Link masters, hubs, and interface modules, which facilitate real-time data exchange and device parameterization in Industrial Internet of Things (IIoT) environments. These modules are widely used for their reliability, interoperability, and compliance with the IO-Link standard (IEC 61131-9).