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Defining User and Functional Requirements for Process Manufacturing
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Defining User and Functional Requirements for Process Manufacturing
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This web is provided by ControlDraw Ltd to support the community of engineers who write Requirements Specifications for Process Control Systems.
At present this is focused on developing User Requirements Specifications (URS's) and Functional Requirements Specifications (FRS), in general for Process automation systems such and DCS and PLC's.
It is primarily designed for Process and Control Engineers who have to develop a specification from Process Descriptions and Piping and Instrument Diagrams.
If is also for those people who want to write better Process Descriptions.
The Life Cycle provides some explanation of the stages in developing a Process Automation System.
But Life Cycles are a recent concept compared with Process Control existed before there were PLC's, DCS's or Microcomputers. A Brief History of Instrument Specifications describes how we managed before them.
For a more modern approach, see the Requirements Analysis Process
The ISA S88.01 standard (S88) is an important international standard for describing batch processes but it is also highly applicable to other processes including continuous and discrete ones. It is good practise to write the URS using the terminology defined in S88.
Establishing the Requirements
The detailed requirements are to be found in several places including
Engineering diagrams such as Process Flow Diagrams and Piping & Instrument Diagrams
The Control and Operability Philosophy if one exists (if it does not the write one first)
Peoples Heads
Company Standards
Equipment suppliers control definitions
Elucidating the detailed requirements is where methodology such as a model based approach and a good Model Review Process is essential
Documenting the Requirements can be done using text and various types of diagrams.There are some software tools that can help too.
See more on the URS Links page
Note that this web is still being developed, check What's New for recent changes.
If you have any questions, or suggestions for this web site please email us.