The book “PROFIBUS PA” by Christian Diedrich, ThomasBangemann and several co-authors is available now in a revised andupdated English version. This book is a must for all, who need in-depthinformation about PROFIBUS in the process industries. It is just asuseful for developers of PA devices as for planners, endusers ormaintenance staff. The introductory chapters give an overview about thefundamental functionality of process devices with PROFIBUS PA interfaceand the general automation principles in process engineering andespecially in hybrid applications. The transmission and installationtechnology with special consideration of the ex zones existing inchemical plants are treated in detail, including the MBP transmissionand the FISCO concept which both play a special role in processautomation with fieldbusses. After the description of the PROFIBUS DP -protocol, which is the basis of all PROFIBUS communication, the profile“PA Devices”, developed particularly for processautomation, is introduced. The current amendments of the PA-profile,“PROFIsafe for PA Devices”, “Condensed Status andDiagnostic Messages", based on the VDI/VDE/NAMUR/WIB 2650guideline, and "Identification and Maintenance Functions" arecomprehensively considered. Chapters for device integration, devicedevelopment and interoperability testing as well as a glossary roundout the contents of this book and make it an indispensable referencefor experienced engineers as well as for newcomers to the field ofprocess automation.