3511/4 OSL nternational Standard NTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEXAYHAPOAHAR OPIAHM3ALWA NO CTAHAAPTW3ALMWORGANISATION INTERNATIONALEDE NORMALISATION Industrial process measurement control functions and instrumentation - Symbolic representation Part 4: Basic symbols for process computer, interface, and shared display/control functions Fonctions de regulation, de mesure et d'automatisme des processus industriels - Representation symbolique Partie4:Symboles debasepourlareprésentation desfonctions calculateur First edition - 1985-08-15 0 3511/4-1985 (E) UDC 744.43 : 62-52 : 003.62 Ref. No. ISO 3511/4-1985 (E) Descriptors : technical drawing, graphic symbols, control functions, measuring instruments, control devices, adjusting systems. Price based on 8 pages Not for Resale Foreword Iso (the lnternational Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with isO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approvai before their acceptance as International Standards by least 75 % approval by the member bodies voting. Technical drawings. This part of ISO 3511 was developed by sub-committee 3, Graphical symbols for instrumentation. The symbols are intended to be used to represent functions and, in special cases, equipment on technical drawings such as schematic diagrams or process flow-diagrams. However, this field of engineering is closely related to electrical instrumentation dealt with by IEC/TC 65 or in part by IEC/SC 3A. For this reason there has been close coordination in a joint working group and the results were accepted by members of ISO and IEC. International Organization for Standardization, 1985 Printed in Switzerland Copyright Intenatinal Organization for Standardization ed without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 3511/4-1985 (E) Industrial process measurement control functions and instrumentation - Symbolic representation Part 4: Basic symbols for process computer, interface, and shared display/control functions 0 Introduction computer and/or shared display/control functions in the field This International Standard has been devised to provide a of process measurement and control and may be used with the symbois of ISO 3511/1 and ISO 3511/2. They will enable users universal means of communication between the various in- to show and identify in simple form the functions of instru- terests involved in the design, manufacture, installation and operation of measurement and control equipment used in the ments, the process computer, and shared display/controi func- tions, or any combination of these. process industries. It is permissible to use the basic symbol for computer-based Requirements within the industries vary considerably; in functions (see 3.1) throughout for any software-based digital recognition of this, this International Standard is presented in system. This is not intended to preclude the use of the basic four parts as follows: symbol for shared display/control functions (see 3.2) if the user considers this to be appropriate. Part 1: Basic requirements (directed towards the needs of those employing comparatively simple measurement and The symbols are intentionally limited to identification on pro control means). cess flow diagrams, piping and instrument diagrams, etc. and do not provide means of ilustrating specific instruments or Part 2: Extension of basic requirements. parts thereof. Part 3: Detailed symbols for instrument interconnection The letter code for function identification shall be taken from diagrams. table 1 of ISO 3511/1 and ISO 3511/2. Part 4: Basic symbols for p