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

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12.0. Boiler OLCS: Introduction to Interlock and Protection of Boiler BMS, SADC, and SB Control

12.0.1. General

The closed-loop control always takes feedback from the process for which it is employed and readjusts the control output accordingly to obtain the desired process parameter. In other words when a more accurate or adaptive control is necessary, it is imperative that the output signal system back to the controller be measured as another input of the control system. This type of system is referred to as a closed-loop control (CLC). Normally, CLC is regarded as a regulatory part of total control systems and is accommodated in the auto control loops. An open-loop control (OLC); in contrast, does not utilize the same (feedback) and so is also ...

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