dl-breadcrumbs__homedl-breadcrumb-item__separatorConfiguration and programmingdl-breadcrumb-item__separatorProgramming with CODESYSdl-breadcrumb-item__separatorAutomation Builderdl-breadcrumb-item__separator...dl-breadcrumb-item__separatorReference: Programming dl-breadcrumb-item__separatorProgramming Languages and Editors dl-breadcrumb-item__separatorCODESYS LD FBD editordl-breadcrumb-item__separatorOverview dl-breadcrumb-item__separatorFunction Block Diagram (FBD)
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Function Block Diagram (FBD)

The function block diagram is a graphically oriented IEC 61131 programming language. It works with a list of networks. In this way, each network contains a structure that can contain logical and arithmetic expressions, calls of function blocks, a jump or a return instruction.

Boxes familiar from Boolean algebra are used here. Boxes and variables are connected by connecting lines. The signal flow in the network runs from left to right. The signal flow in the editor runs from top to bottom, starting with network 1.

Example

_cds_img_fbd_example.png

CFC is also a programming language based on the same principle as FBD, but with the following differences:

  • The CFC editor is not network-oriented.

  • You can freely place the elements in the CFC editor.

  • Direct insertion of feedbacks is possible.

  • The order of execution is determined by a list of currently inserted elements, which you can change.

For more information, see: ⮫ “Programming in the Function Block Diagram (FBD) ”