Programmable logic controllers (PLCs) now have capabilities once found only in distributed control systems (DCSs), while a DCS can handle many functions previously thought more appropriate for PLCs.
VSD’s (variable speed drives) adjust the speed and torque in an electric motor according the parameters with which they are programmed. VSD programming works by helping convert electrical power of a certain frequency level to variable frequency levels and thereby gives you the ability to run a motor at a speed you choose.
Supervisory Control and Data Acquisition (SCADA) is a control system architecture that uses computers, networked data communications and graphical user interfaces for high-level process supervisory management, but uses other peripheral devices such as programmable logic controller (PLC) and discrete PID controllers to interface with the process plant or machinery. The use of SCADA has been also considered for management and operations of project-driven-process in construction.
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