The textbook covers topics from control and regulation technology as necessary for the use of programmable logic controllers (PLCs). The first part of the book explains the fundamentals of control technology, the structure, and the functioning of a PLC. The second part deals with linking and sequential controls. The third part introduces the processing of digital signals to present the basic operations for digital controls, word processing, description methods, and design methods for digital control programs. The concluding fourth part addresses the basic concepts of regulation technology. It demonstrates how the fundamental elements of regulation technology are implemented in a PLC. The book includes a complete operation list of the STEP-5 programming language and a commented program directory.