This book will provide the basic knowledge of PLC programming to reader. Information provided in this book is to the point and easy to understand. All the topics are explained with sufficient number of pictures so that reader will be able to understand the topic more clearly. Present book explains the programming of S7-300/400 family PLC using SIMATIC MANAGER software. Information about hardware is also given so that reader will be easily able to relate the information with actual hardware available to them. Basic explanation of ladder logic programming and its components is also given in this book. This book is specially written for the beginners who are new in the automation world. They will be able to create & test PLC programs themselves after reading this book. This book will provide sufficient guidance and work as handbook for newcomers. The steps and sequence provided in this book is same as actual practice generally followed by professionals. So that readers will be able to move swiftly towards professional practice of PLC programming.