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{{About|the graphical programming language|the block diagram used in systems engineering|Functional block diagram}}
[[File:FBS Maximum.jpg|thumb|Simple function block diagram]]
The '''function block diagram''' ('''FBD''') is a [[Visual_programming_language|graphical language]] for [[programmable logic controller]] design,<ref>R. W Lewis (2001) ''Modelling Distributed Control Systems Using IEC 61499''. p. 9</ref> that can describe the function between input variables and output variables. A function is described as a set of elementary blocks. Input and output variables are connected to blocks by connection lines.
Inputs and outputs of the blocks are wired together with connection lines or links. Single lines may be used to connect two logical points of the diagram:
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