IEC PAS 62424:2005 pdf download Representation of process control engineering requests in P&I diagrams and data exchange between P&ID tools and PCE-CAE tools
This specification describes how process control engineering requests are represented in a P&diagram.
it also defines the exchange of process control engineering request relevant data between aprocess control engineering tool and a P&l tool by means of a data transfer language (calledCAEX). These provisions apply to the export/import applications of such tools.
The representation of the PCE functionality in P& diagrams is defined by a minimum number ofrules to clearlv indicate their cateaory and processing function, independent from the technique otrealization (see Clause 6). The definition of graphical symbols for process equipment (for examplevessels, valves, columns, etc.), their implementation and rules for the numbering system are notthe scope of this standard. These rules are independent from this standard and can be found, forexample,within DIN ENISO 10628 or ISO 14617
Clause 7 specifies the data flow between the different tools and the data model CAEX
2 Normative references
The following referenced documents are indispensable for the application of this document. Fordated references, only the edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.
IEC 60050-826,International Electrotechnica/ Vocabulary – Part 826: Electrical installations ofbuildings
IEC 61346-1 (all parts), Industrial systems, installations and equipment and industrial products -Structuring principles and reference designation
IEC 61511-1 (all parts) , Functional safety – Safety lnstrumented Systems for the process industrysector
ISO 10628,Flow diagrams for process plants – General rules
ISO 14617 (all parts), Graphical symbols for diagrams
EN 13480-1, Metallic industrial piping – Part 1: General
EN 1594, Gas supply systems – Pipelines for maximum operating pressure over 16 barFunctionalrequirements
EN 982, Safety of machinery – Safety requirements for fluid power systems and their components-Hydraulics
Extensible Markup Language (XML) 1.0 (Third Edition), W3C Recommendation 04 February 2004(available at )
3 Terms and definitions
For the purpose of this document, the following terms and definitions, as well as those given in60050-826apply
3.1
process control equipment
equipment,having a process control function
3.2
process control function
function to work on process variables, which is composed of basic functions of process controlspecific to units of the plant
NOTE in addition to process control functions associated with single sensors and actuators, there can also be processcontrol functions that link input and output variables across several sensors and actuators, For instance, a processcontrol function in the feedback path with the controlled variable as input variable and the manipulated variable as outputvarlable, describes the action path from the sensor via the controller to the final controlling element.
3.3PCE request
a PCE request describes requirements for process control equipment, Each PCE request isgraphically represented by a bubble which collects all information on the functional requirements
3.4
sensor
functional unit that senses the effect of a measured variable at its input and places acorresponding measurement signal at its output
NOTEExamples of sensors are:
a) Thermocouple; b) Foil strain gauge; c) pH electrode
3.5
Actuator
functional unit that generates from the controller output variable the manipulated variable requiredto drive the final controlling element
NOTE If the final controling element is mechanically actuated, it is controlled via an actuating drive. The actuator drivesthe actuating drive in this case.
EXAMPLEA practical exampl of an actuator acting directly on the final controlling element is a d.c. drive. The controlunit takes the function of an actuator. The fnal controlling element is formed by the thyristor assembly that delivers avarlable d.c. voltage as an output variable. The control unit and the thyristor assembly together form the final controlindequipment.
3.6
CEloop
collection of PCE requests and PCE control functions depicting their functional coherence