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    What is the FFB execution order on Unity Pro FBD section?

    Goals and Symptoms
    What is the FFB execution order on Unity Pro FBD section?

    Facts and Change
    Unity Pro all versions
    .

    Causes and Fixes

    The execution order is determined by the position of the FFBs in the section (executed from left to right and from top to bottom) and is displayed with execution numbers on the top right corner of the FFB. When your logic has FFB inputs that comes from another FFB, the execution order will be as bellow:
    1. Execute from top to bottom all FFBs that don't have another FFB as input (on the left side)
    2. Execute from top to bottom all FFBs that have another FFB as inpput
    ​The picture bellow shows the execution order and you can see that the FFB 13 will be executed before the 11 that is above.

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