AS-Interface gateways with fail-safe PLC are industrial automation products primarily associated with brands like Siemens (Germany), Pepperl+Fuchs (Germany), and Bihl+Wiedemann (Germany). These gateways serve as communication interfaces between AS-Interface (Actuator-Sensor-Interface) networks and higher-level PLC (Programmable Logic Controller) systems, ensuring fail-safe operation in critical applications. They are widely used in manufacturing, process automation, and logistics industries for real-time control and safety monitoring. Key products include AS-i safety monitors, gateways with integrated PLC functionality, and diagnostic tools. Companies like Siemens offer solutions such as the SIMATIC AS-Interface range, while Pepperl+Fuchs specializes in robust AS-i safety components. These products comply with international standards (e.g., IEC 62026) and enable seamless integration with industrial networks like PROFINET or PROFIsafe.