What is PD IEC/PAS 63131 - System control diagram about?
PD IEC/PAS 63131 is intended to cover functional as well as drawing-related requirements for use of SCDs.
PD IEC/PAS 63131 gives a standardized operator interface on a functional level. The logic diagrams carry a simplified process sketch as background, inherited from PFD/P&ID’s, which enables reviews of the control applications in a multi-discipline environment.
Who is PD IEC/PAS 63131 - System control diagram for?
PD IEC/PAS 63131 on system control diagram is useful for:
- Control system engineers
- Control application suppliers
- Oil and Gas industry
Why should you use PD IEC/PAS 63131 - System control diagram ?
The SCD combines all functional design requirements into a common unambiguous document and represents a top-down approach to the design of the system.
Because the SCDs can be developed in parallel with the P&IDs, introduction of the SCD approach facilitate a parallel development of both the physical and functional relationships visualised on dedicated documents. This approach encourages team work between different disciplines during the process development phases and the traditional artificial split between the development of physical and functional relationships may be eliminated. Thus enhanced overall quality is achievable.
The main objective for this PAS is to define a limited set of complete operational control functions (objects) and an explanatory condensed logical diagram, suitable for use in the continuous control process industry – e.g. Oil and Gas processes. This PAS also includes a method of documenting sequences (ref. IEC 60848) and their interaction with the control objects.
PD IEC/PAS 63131 will provide the means to fill the gap between the P&ID’s and the Functional requirement diagrams. (Ref IEC 61804.) The control functions definitions include required behavior descriptions of control modes, interlocking (Safeguarding), blocking and other operator commands. PD IEC/PAS 63131 can also be used as the basis for defining a companion standard to OPC-UA (IEC 62541).
The main drivers for establishing PD IEC/PAS 63131 are the advantage of efficient engineering, implementation, and commissioning, as well as reuse of the control application across different suppliers of control systems. The diagrams give an unambiguous logical representation that is suited for data transfer.
