S7-200: SIMATIC S7-200 applications range from replacing relays and contactors to handling less complex automation tasks in standalone mode, in networks and within distributed configurations.  To save costs, the S7-200 is increasingly being employed in areas that previously required special electronics.  In addition to the comprehensive basic functionality of the five available CPUs a wide range of I/O and function modules provides solutions tailored to the customers requirements. S7-300: