FileExists

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Function Block - Tests if a file exists.

Inputs

Input	Data Type	Range	Unit	Default	Description
Execute	BOOL	0 to 1	N/A	No default	On the rising edge, test to see if a file exists.
Path	STRING	N/A	N/A	No default	The path to the file.

Outputs

Output	Data Type	Description
Done	BOOL	If TRUE, the command completed successfully.
Error	BOOL	If TRUE, an error has occurred.
ErrorID	DINT	Indicates the error if Error output is TRUE. See the table in File and TCP/IP Function Block ErrorIDs.
Exists	BOOL	The existence of the file. TRUE: Indicates the file exists FALSE: Indicates the file does not exist.

Remarks

Figure 1: FileExists

FBD Language Example

Not available.

FFLD Language Example

Not available.

IL Language Example

Not available.

ST Language Example

(* FileExists example *)
CASE StepCounter OF
0:
   Inst_FileExists(TRUE, 'Test.txt');
   StepCounter := StepCounter + 1;
1:
   Inst_FileExists(TRUE, 'Test.txt');
   IF Inst_FileExists.Done THEN
      TestFileExists := Inst_FileExists.Exists;
      Inst_FileExists(FALSE, '');
      StepCounter := StepCounter + 1;
   END_IF;
END_CASE;