Rockwell-automation Logix5000 Controllers Function Block Diagram Progr Instrukcja Użytkownika Pobierz pdf (Strona 13)

Program a Function Block Diagram Chapter 1

The new tagA value of 50.9 is not used by any IREFs in this routine until the start

of the next scan.

Order of execution

The Logix Designer application automatically determines the order of execution

for the function blocks in a routine.

• When you verify a function block routine.

• When you verify a project that contains a function block routine.

• When you download a project that contains a function block routine.

Define the order of execution by wiring function blocks together and indicating

the data flow of any feedback wires, if necessary.

If function blocks are not wired together, it does not matter which block executes

first. There is no data flow between the blocks.

If the blocks are wired sequentially, the order of execution moves from input to

output. The inputs of a block require data to be available before the controller can

execute that block. In this example, block 2 has to execute before block 3 because

the outputs of block 2 feed the inputs of block 3.

Rockwell Automation Publication 1756-PM009E-EN-P - October 2014 13

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Rockwell-automation Logix5000 Controllers Function Block Diagram Progr Instrukcja Użytkownika Strona 13