In this article, we will learn about why we prepare Functional Design Specifications for DCS and SIS Projects. What are the basic purposes and requirements considered in Functional Design Specifications?
Functional Design Specifications (FDS) are vital in DCS (Distributed Control System) and SIS (Safety Instrumented System) projects as they provide a detailed description of the system’s functional requirements.
The FDS is an essential document that guides the development process and ensures that the system built meets the operational needs of the project.
The main purposes of the Functional Design Specifications (FDS) include:
The FDS provides a detailed explanation of how the system should behave, which is essential for project stakeholders to understand the intended operation of the system. It helps reduce misinterpretations and ambiguities about system requirements.
The FDS serves as a guide for the system developers to ensure that the system built aligns with the documented specifications.
The FDS provides the foundation for creating test cases to validate the functionalities of the system during the testing phase.
The FDS document can also be used as a reference in the future for system upgrades, maintenance, or troubleshooting.
The following requirements are typically considered in a Functional Design Specification:
A general description of the control system, its purpose, and its expected behavior.
Detailed specifications of what functions the system should perform, under what conditions, and how the system should react to specific inputs. This could include control loops, alarm management, sequence of operations, interlocks, etc.
Descriptions of how the system should operate under normal and abnormal conditions. This includes procedures for startup, shutdown, and emergencies.
Specifications about how the system interacts with other systems and how data should be exchanged. This could include details about communication protocols, data formats, etc.
Particularly in SIS projects, safety is a critical aspect. Therefore, the FDS should define the safety functions and performance levels needed, along with specifying any safety-related features like fail-safe operations, redundancies, etc.
Definitions of the system’s required performance levels. This could involve specifications about system response times, throughput, availability, reliability, etc.
Descriptions of the data to be used by the system, including input data, output data, and how this data should be managed.
Details about how the system should interact with the user, which includes design considerations, interaction modes, and display formats.
Note: The level of detail in the FDS can vary from project to project. It should be sufficient enough to ensure that everyone involved understands how the system should function and should form the basis of the agreement between all stakeholders.
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