Control Systems

DCS System

DCS System: A DCS System is preferred over a central computer system for the following reasons. Central Computer System (CCS) exposes the plant to the risk that the system might fail. This can be minimized by having one or more back up schemes. A back up computer Analog controller Manual loading stations Various combinations of the …

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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 …

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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 …

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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 …

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PLC Basic Process

PLC Basic Process: A PLC Basic Process is basically made up of the following sections, each of which has a unique function to perform in its operation. The sections are: Sensing inputs or controlling hardware PLC input hardware Controller or CPU Hand held programming device or personal computer Output PLC hardware Hardware output devices Sensing …

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