Siemens Simatic ET200 series includes a wide variety of I/O systems available for standard and fail-safe automation. The modular design allows you to scale the ET 200 systems in small steps, for example, to expand with fail-safe I/O modules. Built-in design features include: one system for standard and safety automation; uniform safety functionality for all Simatic devices; uniform operating capability of the TIA Portal enabling intuitive safety function engineering; compact design to reduce space required; seamless system; and external safety solutions not required.