Safe Input/Output Modules are a category of industrial automation products designed to ensure secure and reliable signal transmission in hazardous environments. These modules are produced by various global companies, such as Siemens (Germany), Rockwell Automation (USA), and Phoenix Contact (Germany). They serve industries like manufacturing, oil and gas, and chemical processing, where safety and precision are critical. Key products include isolated I/O modules, safety relays, and barrier modules, which protect equipment and personnel from electrical faults and explosions. Brands like Pepperl+Fuchs (Germany) and R. STAHL (Germany) specialize in explosion-proof and intrinsically safe solutions, complying with international standards like ATEX and IECEx.