The development of a control system may be divided into various stages as
shown in the project development life cycle . A management
decision, based on timing and resource availability, is made as to the
best stage to obtain competitive tenders for remaining design, supply
or installation work from specialist contractors. The first step is to
carefullydetail the system to be controlled together with possible future
expansion requirements. This initial description must carefully detail
the hardware and software interfaces and addresses such questions
as the physical location of devices, supervisory control connections,
motor or actuator loads and physicalenclosure protection.
The second step is to define the operational control requirements in a concise
and accurate descriptive form. At this second stage, it is essential that full
consultation is made with operatives and maintenance crews as well as the
engineers in order to ensure the correctness of the descriptions and definitions
of the user’s wishes. These descriptive control requirements are then converted
in a particular format as a sequence of logical events. A specification (sometimes
termed Functional Design Specification orFDS) is next prepared for both the
hardware and software. The hardware specificationshould cover the following points:
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