ISO 3511-4:1985

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ISO 3511-4:1985 defines basic symbols for representing process computer, interface, and shared display/control functions in industrial process measurement and control. These symbols are intended for use in flow diagrams, piping diagrams, and instrument diagrams to identify process computer, interface, and shared display/control functions. The standard is part of a larger series (ISO 3511) that provides a standardized system for symbolic representation in this field.