winsem2012 13 cp0285-04-feb-2013_rm01_3_evolution-of-ncs
TRANSCRIPT
DISTRIBUTED CONTROL SYSTEM
• A system of dividing plant or process control into several areas of responsibility, each managed by its own controller, with the whole system connected to form a single entity, usually by means of communication buses..
Localized vs DistributedLocalized Distributed
Processing tool
Programmable logic controller / Programmable controller
Remote Terminal Unit
Priority Data AcquisitionLocal AutomationData Transmission (Opt)
Data AcquisitionData TransmissionLocal Automation (Opt)
•Both PLC/PC and RTU support all automation functions only the priority/ sequence differ.•In practice, it is possible to use a Controller as RTU or RTU as Controller