SIMATIC Safety Integrated for Process Automation offers a comprehensive range of safe, fault tolerant and high-availability products for the process industry. All system components are certified by TÜV according to IEC 61508 up to SIL 3 and meet the highest safety class for process applications. The safety instrumented system of Siemens includes safe controllers, safe bus systems and I/O devices as well as safe instrumentation, for example, for pressure measurement. Safety Integrated can be used to implement flexible, modular and integrated solutions for the process and manufacturing industry. Safety Integrated for Process Automation offers optimum integration of the safety instrumented system into the process control system: The basic process control system (BPCS) and safety instrumented system are based on shared hardware. The modularity and flexibility of Safety Integrated permit individual definition of the degree of integration. The basic process control functions can be executed in one controller (automation system) or in separate controllers.