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A circle inside a square, marking a shared control system.
Also known as: DCS instrument symbol, Distributed control symbol, Shared control symbol
On a piping and instrumentation diagram a circle drawn inside a square denotes a function implemented in a shared display and control system rather than as a discrete instrument.
Denotes a function implemented in a shared display and control system rather than in dedicated hardware.
Contexts: Technical drawing
Records that the instrument has no separate physical existence, which matters when tracing a fault: there is no box in the field to inspect.
Contexts: Technical drawing
A circle drawn inside a square, the two sharing a centre, containing the tag letters and number.