applications of plc's

Introduction and Research Objectives

Nowadays, the PLCs have substituted most of the control elements used to conduct the device logic. The word logic is used because the programming relates primarily to logic implementation and switching operations. Controlled input devices such as switches and output devices such as motors are connected to the PLC and then the controller monitors the machine or process inputs and outputs. PLCs were originally developed as a replacement for forward wired relay and timer logic control systems.(Hard cabling means all the components were connected manually by wires).Technological progress in recent years has led to the development of a programmable logic control unit (PLC) and a subsequent revolution in control engineering.

This research explains some applications to show the developed programs

To complete specific tasks. These include tasks that include filling bottles and operating the parking barrier using valves. But before all this, several important elements must be known before speaking. Applications are the definition of programmatic logic control and its different types.

Sequence of operation PLC’s

Basic A typical PLC function

Read all field input devices from the input interfaces, run the user software stored in the computer memory, then turn on or off the field output devices, or execute whatever control is required for the process operation, depending on whatever control scheme the user has configured.

This process of reading the inputs sequentially, executing the program in memory,

and updating the outputs is called the scanning