This PLC-basic course explains the logic control with SIMATIC S7-300. For all programming examples from the practice, also a solution is provided. This book is suitable for trade schools, technical colleges and others, as well as for private study. It contains: Arrangement and functioning of a PLC Program processing and programming Logic operations an program input Momentary impulses, timing functions, clock generators, comparators Practical examples with simulators Sequence control systems Safety regulations Appendix with solutions