page_title: Function block diagram
hierarchical_section_title: Function block diagram
caption_attribution_description: English: function block language, search for maximum Deutsch: Funktionsbausteinsprache, Maximumsuche
context_page_description: The Function Block Diagram is a graphical language for programmable logic controller design, 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:
  An input variable and an input of a block
  An output of a block and an input of another block
  An output of a block and an output variable
  The connection is oriented, meaning that the line carries associated data from the left end to the right end. The left and right ends of the connection line must be of the same type.
  Multiple right connection, also called divergence can be used to broadcast information from its left end to each of its right ends. All ends of the connection must be of the same type.
  Function Block Diagram is one of five languages for logic or control configuration supported by standard IEC 61131-3 for a control system such as a Programmable Logic Controller or a Distributed Control System.
context_section_description: The Function Block Diagram  (FBD) is a graphical language for programmable logic controller design, 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:
  An input variable and an input of a block
  An output of a block and an input of another block
  An output of a block and an output variable
  The connection is oriented, meaning that the line carries associated data from the left end to the right end.  The left and right ends of the connection line must be of the same type.
  Multiple right connection, also called divergence can be used to broadcast information from its left end to each of its right ends.  All ends of the connection must be of the same type.
  Function Block Diagram is one of five languages for logic or control configuration supported by standard IEC 61131-3 for a control system such as a Programmable Logic Controller (PLC) or a Distributed Control System (DCS).  The other supported languages are ladder logic, sequential function chart, structured text, and instruction list.
caption: Simple function block diagram
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