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Answer Posted / delta_v
Maybe you are referring to the main components of DCS...
1. Engineering Workstation - where you create your programs/FBD, etc.
2. Operator Workstation - monitoring and operation only, some call it as HIS/HMI
3. Network Communication - to communicate your workstations and field control stations
4. Field Control Stations - that's where your field control units are installed
"You cannot control, what you cannot measure"
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