The languages defined by the standard IEC 6-1131 for Programmable Logic Controllers (PLCs), have both benefits and drawbacks compared to object-oriented programming languages. This is a book for beginners and therefore advanced techniques such as ARRAY, LOOPS, STRUCT, ENUM, STRING, PID and FIFO are not included.
In addition, there is a difference in how the individual PLC type shows graphic symbols and instructions used in Ladder programming. This means that some of the program examples in this book may not work as intended in the PLC type you are using. This will be clear through material from the vendor. PLC vendors understand this standard in different ways, and not all vendors follows the standard exactly. The book describes Ladder programming as described in the standard IEC 61131-3. Please note that the book can easily be used for the many other educations and institutions that teach PLC programming including educations such as electrician, electrical engineer, automation control, PLC programmer, instrument technician and process electrician, automation technician and electrician. The book was developed for the full-time “Academy Profession (AP) Graduate in Automation Engineering” course and the part-time “AP Degree in Automation and Operation” course at the Dania Academy, Randers, Denmark. There are several explanations to the program code examples, and there is a focus on the program code being clear, readable and structured. Afterwards, the book can be used as a reference to solve specific problems. Therefore, it is recommended to read the book from the beginning, as the first chapters are a general introduction to PLC programming, which is the basis for being able to write a good PLC program.
The book systematically describes basic ladder programming, which means that knowledge is built and deepened throughout the book. The book provides a general introduction to Ladder programming with a focus on enabling learners without an electrical engineering education to learn Ladder programming. This book is an introduction to the programming language Ladder Diagram (LD) used in Programmable Logic Controllers (PLC).
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