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Power Plant Instrumentation and Control Handbook by Ajay Kumar Debnath, Swapan Basu

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2. PLC System: Introduction

What is PLC system? A programmable control system is a digital computer deployed for automation and monitoring of electromechanical and/or electrochemical processes. The applications of PLC in power plants includes a burner management system (BMS)/automatic turbine run up system (ATRS) etc. Because of its versatility often people refer to them as the “Cinderella of control.”
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FIGURE VII/2.0.1-1 Basic PLC configuration.
Normally when ratio of the digital to analog signal is high, PLCs find their applications from an economical point of view. On the other hand, DCSs are used for data acquisition systems (DASs), PIDs, and ...

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