ISA 5.1-2009

Establishes a uniform means of designating instruments and instrumentation systems used for measurement and control. The different needs of various organizations are recognized (where not inconsistent with the objectives of the standard) by providing alternative symbolism methods. A number of options are provided for adding information or simplifying the symbolism, if desired. Includes additional information on symbolism for function blocks, function designations, computer functions, and programmable logic control.