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The programming language STEP7 is an advanced development of STEP5 and it is applied for the controller generation "SIMATIC S7". The "SIMATIC S7" is the most widely spread Programmable Logic Controller (PLC) in Europe. This book should help beginners to quickly get used to working with the programming language STEP7. By means of numerous examples the individual topics are introduced to the reader in detail. The book does not only impart the language of STEP7, but also the handling of control devices of the S7-300 series. The chapters Indirect Addressing, Analog Value Processing, Hardware Configuration, Global Data Communication, Profibus DP Configuration, Ethernet Networking and Remote Maintenance are of interest for advanced learners. Using the demo version of WinPLC7 V4(*) you can reproduce the examples on a Windows-PC. Since the simulation software (Software-PLC) is to be operated just like a real S7-PLC, the reader will simultaneously also practice the handling with a real S7 controller. An Overview of S7 Instructions, an overview of S7- PLCs and a Glossary in the appendix complete the book. Topics from this book: · Introduction topics: PLC Technical Basics, Types of Operands, Set-up of an S7 Program, Logic Operations, Timers, Counters, Symbolic Programming, Linear- and Structured Programming, Sequencer Programming, Differences to S5. · Advanced Programming: Block Parameter, Function Blocks, Data Blocks, Jump Instructions, Arithmetic Instructions, Definition of Variables, Analog Value Processing, Indirect Addressing. · Handling of S7 Controllers: Error Diagnostic Options, Call Environment, Hardware Configuration, Profibus-DP Configuration, Diagnostic of DP-Systems, Use and Handling of Profibus-CPs (e.g. CP342), Startup of CPUs with Ethernet Interface, Use and Handling of Ethernet-CPs (e.g. CP343), SPEED7 Configuration · Networking of S7 Controllers: Global Data Communication via MPI, Exchange of Data via Profibus-DP (Master-ISlave-Communication), Projected Connection via Ethernet. · General Automation Topics: Remote Maintenance of S7 Controllers via Analog/ISDN, Remote Maintenance of S7 Controllers via the Internet, Application of a PLC-Analyzer for Error Detection and Process Optimization *The time limit of 60 days can be derestricted via the Internet. By means of the demo version it is possible to enter and simulate app. 90% of the examples. Some examples are too large for the demo version.