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We are glad to introduce the fifth release of the Programmable Logic Controllers which continues to be very easy-to-use book, providing readers with the very basic principles of such controllers without tying to any particular manufacturer of PLC. The present volume contains a truly extensive number of various examples and solved problems intended to assist in better and more thorough understanding of the theory provided, and utilizes various popular controllers, trying to highlight the fundamental knowledge to be used without having to address any of the PLC manufacturers. The publication is intended to help the readers to understand the basic principles of the design and internal architecture, principles of operation of the controllers and to identify the associated safety issues as well as fault diagnostics methods, ways of proper testing and debugging. Numerous case studies have been included in this edition of the book to supplement the theory; the title also features the extended coverage of the sequences, and much more details have been provided there relating to the programming using the sequential function charts, testing inputs and outputs, comparison of various relay-controlled systems etc.; the IEC programming standard has also been touched in this publication together with the programming devices, security issues etc.