It can refer to a device or component used to regulate and control the operation of electronic systems.
For example, in electronics and automation, a controller might be a microcontroller or programmable logic controller (PLC) used to control machinery, appliances, or processes.
It uses electrical signals and digital algorithms to perform its receptive, comparative and corrective functions.
Principles of Operation. An electronic sensor (thermocouple, RTD or transmitter) installed at the measurement location continuously sends an input signal to the controller.
There are three basic types of controllers:Â on-off, proportional and PID. Depending upon the system to be controlled, the operator will be able to use one type or another to control the process.
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