Function Block Diagrams are graphical programs that allow you to define a series of processes that are dependent on a flow. The flow of a signal from one function block to another means that you can create complex relationships between values, functions and so on to define the Logic behavior of your program.
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You must have the required user permissions on the database items that a Logic program references, and (if applicable) the Configure Extended Logic feature enabled in order to successfully compile, execute, or save a Logic program (see User Permissions Required for Working with Logic Programs).
For information on the properties of the Function Block Diagram database items, see Logic Program Properties and Values.