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A functional block diagram in systems engineering and software engineering is a block diagram, that describes the functions and interrelationships of a system. The functional block diagram can picture:〔James Perozzo (1994) ''The complete guide to electronics troubleshooting''. p. 72〕 * Functions of a system pictured by blocks * input and output elements of a block pictured with lines, and * the relationships between the functions * the functional sequences and paths for matter and or signals〔William H. Von Alven (1964) ''Reliability engineering'' explains: "Functional block diagrams show functional sequences and signal paths, and items which are wired in parallel are drawn in parallel" (p. 286)〕 The block diagram can use additional schematic symbols to show particular properties. Functional block diagrams have been used in a wide range from systems engineering to software engineering since the late 1950s. They became a necessity in complex systems design to "understand thoroughly from exterior design the operation of the present system and the relationship of each of the parts to the whole."〔Harry H. Goode, Robert Engel Machol (1957) System engineering: an introduction to the design of large-scale systems. p. 306〕 Many specific type of functional block diagrams have emerged. For example the functional flow block diagram is a combination of the functional block diagram and the flow chart. Many software development methodologies are build with specific functional block diagram techniques. An example from the field of industrial computing is the Function Block Diagram (FBD), a graphical language for the design of programmable logic controllers. ==See also== * Function block diagram * Function model * Functional flow block diagram 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Functional block diagram」の詳細全文を読む スポンサード リンク
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