
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: The block diagram can use additional schematic symbols to show particular properties. Functional block diagrams have been used in a wide range from...
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http://en.wikipedia.org/wiki/Functional_block_diagram

One of the IEC 61131-3 programming languages.
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http://www.youngco.com/young2.asp?ID=4&Type=3
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