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* Remote terminal units (RTUs) connecting to sensors in the process, converting sensor signals to digital data and sending digital data to the supervisory system. | * Remote terminal units (RTUs) connecting to sensors in the process, converting sensor signals to digital data and sending digital data to the supervisory system. | ||
* Programmable Logic controller or [[PLC Controllers]] used as field devices because they are more economical, versatile, flexible, and configurable than special-purpose RTUs. | * Programmable Logic controller or [[PLC Controllers]] used as field devices because they are more economical, versatile, flexible, and configurable than special-purpose RTUs. | ||
* Communication infrastructure connecting the supervisory system to the remote terminal units. | * Communication infrastructure connecting the supervisory system to the remote terminal units. | ||
* Various process and analytical instrumentation | * Various process and analytical instrumentation |