Chapter 14, Problem 16RQ

Program Plan Intro

Programmable Logic Controller (PLC):

• PLC is a specialized computer used in industrial segments to control machines and process.
• PLC is program that consists of a set of instructions which resembles the controlling functions needed to perform specific tasks.
• The function of PLC is similar to that of a relay and hence, in an industrial segment a relay is greatly replaced by a suitable PLC.
• When compared to general Personal Computer (PC), a PLC is available in small and tiny sizes.
• The basic architecture of a PLC consists of an input-output interface module and a small Central Processing Unit (CPU) that runs by controlling programming language.

PID Control:

• The Proportional Integral Derivative (PID) control refers to a feedback control method.
• It performs the combined actions of proportional, integral, and derivative controls.
• It is one of the most widely used process controller.
• The PID control is used to maintain a process variable within the limits of a specified set point. These process variables can be temperature, flow, level, or speed.
• It also allows the control process operations to take place outside the Central Processing Unit (CPU), which in fact, greatly reduces the additional burden of CPU.