Modern power monitors or circuit monitors measure basic parameters such as voltage, current, and kW, but also have additional capa-bilities including alarm logging, power quality measurement, data storage, oscillography, and waveform capture. Provided with input/output mod-ules and various communication options, these devices can be networked together into a dedicated supervisory control and data acquisition (SCADA) system.
Human machine interface (HMI) software running on a PC can present the information available on graphical screens as well as provide the same alarm reporting, trending, and data historian functions that are common to BMS.