FUNCTION_BLOCK DirOpen EXTENDS CBM.ETrig
This function block opens a directory. The entries (files and sub-directories) of which should be read with the help of the function block ”FILE.DirList”. The return value is a handle. There may be restrictions concerning the specification of the directory name, e.g. only capital letters allowed, for different targets. The function ”FILE.GetProperty” shows these restrictions.
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InOut:
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Scope
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Name
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Type
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Comment
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Inherited from
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Input
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xExecute
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BOOL
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Rising edge: Action starts
Falling edge: Resets outputs
If a falling edge occurs before the function block has completed its action, the outputs operate in the usual manner and are only reset if either the action is completed or in the event of an error. In this case, the corresponding output values (xDone, xError) are present at the outputs for exactly one cycle.
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ETrig
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Output
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xDone
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BOOL
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TRUE: Action successfully completed
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ETrig
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xBusy
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BOOL
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TRUE: Function block active
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ETrig
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xError
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BOOL
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TRUE: Error occurred, function block aborts action
FALSE: No error
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ETrig
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Input
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sDirName
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CAA.FILENAME
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Directory name, absolute or relative path specification
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Output
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eError
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ERROR
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Local library error ID (0: no error; 5101: time out)
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hDir
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CAA.HANDLE
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Directory handle
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