Automating with STEP 7 in STL and SCL: SIMATIC S7–300/400 Programmable Controllers

Automating with STEP 7 in STL and SCL SIMATIC is the worldwide established automation system for implementing industrial control systems for machines, manufacturing plants and industrial processes. Relevant open–loop and closed–loop control tasks are formulated in various programming languages with the programming software STEP 7. Now in its sixth edition, this book gives an introduction into the latest version of engineering software STEP 7 V5.5. It describes elements and applications of text–oriented programming languages statement list (STL) and structured control language (SCL) for use with both SIMATIC S7–300 and SIMATIC S7–400, including the new applications with PROFINET and for communication over industrial Ethernet. This book is aimed at all users of SIMATIC S7 controllers. First–time users are introduced to the field of programmable controllers, while advanced users learn about specific applications of the SIMATIC7 automation system. All programming examples found in the book – and even a few extra examples – – are available over the publisher’s website under Downloads. Enclosed with the book is a demo DVD of STEP 7 Professional

Preface 5 Automating with STEP 7 10 Introduction 21 1. SIMATIC S7–300/400 Programmable Controller 22 2. STEP 7 Programming Software 51 3. SIMATIC S7 Program 102 Basic Functions 138 4. Binary Logic Operations 139 5. Memory Functions 149 6. Move Functions 159 7. Timer Functions 171 8. Counter Functions 187 Digital Functions 196 9. Comparison Functions 197 10 Arithmetic Functions 201 11. Math Functions 208 12. Conversion Functions 211 13. Shift Functions 216 14. Word Logic 221 Programming Flow Control 224 15. Status Bits 225 16. Jump Functions 233 17. Master Control Relay 239 18. Block Functions 243 19. Block Parameters 261 Program Processing 276 20. Main Program 277 21. Interrupt Handling 373 22. Restart Characteristics 393 23. Error Handling 409 Variables Handling 422 24. Data Types 423 25. Indirect Addressing 436 26. Direct Variable Access 449 Structured Control Language (SCL) 465 27. Introduction, Language Elements 466 28. Control Statements 478 29. SCL Blocks 483 30. SCL Functions 492 31. IEC functions 505 Appendix 513 32. S5/S7 Converter 514 33. Block Libraries 528 34. STL Operation Overview 538 35. SCL Statement and Function Overview 542 Index 545 Abbreviations 553

Hans Berger was a very experienced developer of automation systems and software and is still just a most successful author of technical books. He has published more than 30 books on automation technology. Including all editions in English, German and Spanish, his total book record comprises more than 75 editions.