1769-OF8C1 A-B  Circuit Board

This model allows for the interaction of activities at the different levels. Each section represents an activity that you perform. Prepare a functional specification to start; then, prepare the detailed analysis. Based on the detailed analysis, you can also develop your programs, enter your programs, and test them. When testing is complete, you are ready to implement the programs in your application. The detailed analysis can be used as the basis for developing your testing procedures and requirements. Because the functional specification is well thought out, it can be used as the program sign-off document.

Functional Specification Content The functional specification represents a very general view of your process or a description of operation. Identify the events and the overall order in which they must occur. Identify the equipment that you will need for your process/operation. Generally indicate the layout of your system. If your application requires a distributed control system, for example, indicate where you will need remote I/O links. Also, you can have a process that is located close to your processor. The process can require faster update time than that provided by a remote I/O link, so you can select an extendedlocal I/O link for that process. Important: Choose a communication rate for your remote I/O link at which every device on the link can communicate.

The program-development portion of your functional specification can be in any form: written statement; flowchart; or rough-draft MCPs, SFCs, and subroutines. Use the form that is most familiar to you. We recommend, however, that you generate rough-draft SFCs and subroutines so that you have a better correspondence between your beginning diagrams and your finished program.

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