Control engineering has evolved over time. In the past, it was the main way for humans to control the system. Recently electricity has been used for control, and early electrical control was based on relays. These relays allow the power to be switched on and off without a mechanical switch. It is common to use relays to determine simple logical controls. The development of low-cost computers has brought the latest revolution, programmable logic controllers (PLCs).
The advent of PLC began in the 1970s and became the most common choice for manufacturing control. PLCs are gaining popularity on factory floors and will probably continue to dominate for some time.
About the Book
It is difficult to design software for control systems. Experienced control engineers have learned a lot of techniques that allow them to solve problems. This book was written to present how to design control software using a programmable logic controller (Plc). It is my personal hope by adopting knowledge in a book that will allow you to write a control program that will quickly work as expected (and avoid learning by costly mistakes).)
This book is designed for students with limited electrical-containing technical knowledge who want to learn the discipline of practical control system design on commonly used hardware. To this end, the book uses the Allen Bradley Control Logix processor to allow depth. Although this chapter focuseson specific hardware, this technique is portable to other PLCs. Whenever possible, the IEC 61131 programming standard will be used to assist in the use of other PLCs.