Rockwell-automation DeviceLogix System User Manual Manual do Utilizador descarregar pdf (Página 71)

Publication RA-UM003B-EN-P - February 2010 71

Bind Function Blocks with I/O Chapter 3

Set Assume Data Available

The Assume Data Available feature should be used when feedback

paths are involved in your logic; this feature assists the Function Block

Editor in determining the function block process order. When

feedback paths are used, the Function Block Editor’s execution order

algorithm may be unable to determine which function block needs to

be resolved first. In this case, you must specify which function block

will be evaluated first by designating that the Function Block Editor

should assume that data is available at a specific input. Once selected,

a double-headed arrow appears at the end of the wire indicating that

it has precedence in the logic.

TIP

Following a verify operation, the software may indicate that it

could not resolve the execution order. In this case, you just use

the Assume Data Available feature to resolve the conflict.

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Rockwell-automation DeviceLogix System User Manual Manual do Utilizador Página 71