FileReadBinData

Description

This function block reads binary data from a file. FileReadBinData stops reading from the file if it fills the passed FrameIn networking dialect, a message is called a frame array, reads FrameSize bytes, or encounters the end of file, whichever comes first.

After a successful call to FileReadBinData, one may use SerializeIn to extract variable data from the binary data read from a file.

Figure 7-200: The FileReadBinData Function Block

Related Functions

FileClose, FileEOF, FileOpenA, FileOpenR, FileOpenW, FileReadLine, FileSeek, FileWriteBinData, FileWriteLine, SerializeIn

See also: File Management

Arguments

Input

Execute	Description	On the rising edgeA rising edge is the transition of a digital signal from low to high. It is also called positive edge read the size of a file.
	Data Type	BOOL
	Range	0, 1
	Unit	N/A
	Default	—
ID	Description	ID of the open file.
	Data Type	UDINT
	Range	N/A
	Unit	N/A
	Default	—
Frame	Description	Where the binary data will be stored
	Data Type	USINT[]
	Range	N/A
	Unit	N/A
	Default	—
FrameSize	Description	Number of bytes to store in the Frame array.
	Data Type	DINT
	Range	N/A
	Unit	N/A
	Default	—

Output

Done	Description	If TRUE, then the command completed successfully
	Data Type	BOOL
Error	Description	If TRUE, an error has occurred
	Data Type	BOOL
ErrorID	Description	Indicates the error if Error output is set to TRUE. See the table in Search IndexFile and TCP/IP Function Block ErrorID Output
	Data Type	DINT
NbRead	Description	The number of bytes read from the file.
	Data Type	STRING

Example

Structured Text

(* FileReadBinData example *)
CASE StepCounter OF
0:
   Inst_FileReadBinData(TRUE, MyInputFileID, InputFrame, 128);
   StepCounter := StepCounter + 1;
1:
   Inst_FileReadBinData(TRUE, MyInputFileID, InputFrame, 128);
   IF Inst_FileReadBinData.Done THEN
      BytesRead := Inst_FileReadBinData.NbRead;
      Inst_FileReadBinData(FALSE, 0, InputFrame, 0);
      StepCounter := StepCounter + 1;
   END_IF;
END_CASE;