Tag: Programmable Logic Controller

Basis of PLC Programming

Basis of PLC Programming: 1.Processor Memory Organisation:The term processor memory organization refers to how certain areas of memory in a given Basis of PLC Programming are used. Different PLC manufacturers organize their memories in different ways. Even though they do not use the same memory make up and terminology, the principles involved are the same. […]

PLC Operation

PLC Operation: To understand the PLC Operation, consider the simple process shown in Fig. 21.63 In this process a mixer motor is to be used to automatically stir the liquid in a vat when the temperature and pressure reach a preset values. In addition, direct manual operation is also provided by means of a separate […]

PLC Components

PLC Components: A PLC is a solid state device designed to perform logic functions previously accomplished by electro-magnetic relays. Basically, the PLC Components is an assembly of solid state digital logic decisions which provides outputs. PLCs are used for the control and operation of manufacturing, process equipment and machinery. A typical PLC can be divided […]

PLC Hardware

PLC Hardware: PLC hardware falls into the following physical configuration: 1. Fixed Input/ Output (I/O) and 2. Modular I/O. 1.Fixed 1/0 PLCs A fixed PLC Hardware consists of a fixed, or built-in, input/output section. There is one fixed or built-in, non removable screw terminal strip containing all input signal screw terminal connections and another terminal […]

PLC Programming Languages

PLC Programming Languages: The term PLC programming languages refers to the method by which the user communicates information to the PLC. The two most common language struc­tures are ladder diagram language and Boolean language. Ladder diagram language is by far the most commonly used PLC Programming Languages.Figure. 21,53, shows a comparsion of the ladder diagram […]

PLC System Operation

PLC System Operation: A PLC System Operation works by continually scanning a program. This scan cycle can be considered as made up of three important states as shown in Fig. 21.23. In addition there are also more than three states and these are used for checking the system and updating the internal counter and timer […]

PLC Definition

PLC Definition(Programmable Logic Controller or Program­mable Controller): PLC Definition – Programmable Logic Controller (PLC) or commonly simply called a Program­mable Controller, is a solid state, digital, industrial computer. It is a device that was invented to replace the necessary sequential relay circuits for machine control. The PLC basically operates by looking at its inputs and […]