DCS is generally used for plants having a large number of inputs and outputs. DCSĭCS stands for Distributed Control System. So, in a simple language, PLC will have a program written in its processor, which will keep communicating/controlling with the inputs and outputs connected to the input and output cards and thus keep the plant running as per the logic written in the controller. Other protection/control systems like Bentley Nevada Machine Condition Monitoring System, Woodward control system, and many more are used with PLC for achieving the desired purpose of running a compressor or other equipment. One should also note that Safety PLC is also available in the market and used in plants for taking action very quickly (10 to 100 milliseconds) and running plants smoothly. PLCs are used to control plants or units like compressors, nitrogen generation units, hydrogen generation units, desalination units, and other units having limited input and output which requires controlling with a high scan rate (near 100 milliseconds). PLC has its own controller, input-output cards, and communication cards to communicate with other systems. PLC is mainly used for performing certain functions or in other way we can say that we use a single PLC to run small to medium-sized plants. PLC stands for Programmable Logic Controller. PLC, DCS, RTU, SCADA, and PAC which often create confusion in our minds when we want to differentiate between them. Today in this article we will have a look at some most commonly used technologies i.e.
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