Author

• Muhanad Dhiya Hashim

Abstract

In the industrial world the computers and microprocessors have become popular for use in automatic control systems, thus we have a new generation of control systems which is called Programmable Logic Controller . These systems has plenty of control components )Timers, Counters, Registers, Comparator, Clock, …(inside the software of the PLC instead of the classical components , and the
contacts of the relay ) Normal open and Normal close ) have been replaced by the orders which are saved in memory. The updating and modification of the system is easy to obtain by rewriting the program.Another advantage of the PLC is that the input of the PLC is photo isolated and shielded , but the most important advantage is that we can test the program befor it's using in the machine by using the simulator which is included with the PLC program

Keywords

• Programmable Logic Controller
• Ladder Language
• Function Black Diagram
• Structured Text
• Insturction List
• secquential Function Chart