Book; it consists of nine sections under the titles of Control Circuits, Simatic S7-200 Control Unit, Basic Control Applications, Design and Implementation, Program Control Operations, Numerical Operations, Real Time Operations, Interrupted Operation and Questions. In the book, it is shown how the mathematical expressions obtained for the design of a control system are realized with the Simatic S7-200 family PLC using standard (IEC 61131) PLC languages (such as LAD, FBD). However, since the expression of the obtained logic functions in standard PLC languages is the same, it is also valid for PLC models of other companies that can be programmed with all standard PLC languages. Many examples in the book can be easily adapted and applied to other PLC models with simple editing.