Advantages of PLCs

   Reference : Siemens Basics of Plc  

    a PLC can  do complex tasks, replacing wiring between devices and relays by PLC

    program.Modifying the application and correcting errors are easier . program in

    a PLC easy to create and change  .

START With Programmable Logic Controller (PLC)

 

Introduction to PLC and Types of Control System

Programmable Logic Controllers ( PLCs ), are in the computer family. They are used in industrial applications. A PLC oversee inputs, run its control program then makes decisions , and controls outputs to make a process or machine run automatically. I will discuss basic information on the  of  PLCs functions and configurations

HISTORY OF AUTOMATIC CONTROL

 Reference : Applied Optimal Control and Estimation, Prentice-Hall, 1992 

Feedback (Automatic) control

is an engineering discipline. As such, its progress is closely tied to the practical problems that needed to be solved during any phase of human history. The key developments in the history of mankind that affected the progress of feedback control were:

1-The Water Clocks of the Greeks and Arabs.

2-The Industrial Revolution. 

3-Age of Computer and programmable devices