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redirect taken off and text and diagram added, inlcuding table from P&ID diagram article. Control loop is an important building block of automatic control and should not just re-direct. It can now also be linked to other articles that use this term |
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The controller function can be a discrete controller, or a function block in a computerised control system such as a [[distributed control system]] or a [[programmable logic controller]]. In all cases the control loop is a very convenient and useful way of representing the control function. In practice at a process control level the control loops are normally abbreviated using standard symbols in a [[Piping and instrumentation diagram]], which shows all elements of the process measurement and control based on a [[process flow diagram]].<ref>{{cite web|title=Piping and instrumentation diagram P&ID|url=http://processflowsystems.com/piping-instrumentation-diagram-pid/|website=Process Flow Systems|accessdate=16 September 2017}}</ref>
At a detailed level the control loop connection diagram is also amended to show the electrical and pneumatic connections which greatly aids diagnostics and repair, as all the connections for a single control function are on one diagram.
==Tagging==
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