How do the various modules of a distributed control system communicate with each other in order to ensure proper integrity as well as proper interfaces(e.g., Engineering interface , operator interface etc.) ?
It depends on the distributed control system (DCS) and where the module/function resides.
Communications between nodes (i.e., controller and operator interface) of proprietary systems use vendor designed, built, and supported protocols.
Communication between nodes of systems assembled using different supplier's "open" products will likely use OPC (OLE for Process Control, visit http://www.opcfoundation.org to learn more).
Communication between functions/blocks (i.e., analog input block => PID block => analog output block) within the same node (controller) use what the supplier deems best. Visit http://www.controleng.com to learn all about control system idiosyncrasies.
It depends on the distributed control system (DCS) and where the module/function resides.
Communications between nodes (i.e., controller and operator interface) of proprietary systems use vendor designed, built, and supported protocols. Communication between nodes of systems assembled using different supplier's "open" products will likely use OPC (OLE for Process Control, visit http://www.opcfoundation.org to learn more). Communication between functions/blocks (i.e., analog input block => PID
block => analog output block) within the same node (controller) use what the supplier deems best. Visit http://www.controleng.com to learn all
about control system idiosyncrasies.
Simple it's just a matter of matching Protocols, well protocols are rules of conventions define by a specific organizations or in Layman's Term Languages modules must speak the same languages to be able to communicate these protocols have different capabilities in terms of speed, distance and reliability
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