Automatic control function programming manual ladder language

REMARKS Function «USER_OPEN_F» does not check the file type.
Function «USER_OPEN_F» sets the file pointer to the first byte in the file.
Programming error causing a CPU fault
Access to a prohibited address:
- *pF_id parameter error,
- *pfilename parameter error.
Close a File USER_CLOSE_F
Syntax
Description
Closes a file opened by function «USER_OPEN_F».
Parameters
Inputs: pF_id: File identifier
Outputs: None
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SINT32 USER_CLOSE_F(UINT32 F_Id)
REMARK Since only a limited number of files can be opened simultaneously, function
«USER_CLOSE_F» must be used as soon as it is no longer necessary to have the
file open.
Read the Data in a File USER_READ_F
Syntax
SINT32 USER_READ_F(UINT32 pF_Id, UINT8 *pBuf, UINT32 Requestno, UINT32 No_read)
Parameters
Inputs: pF_id: File identifier returned by USER_OPEN_F.
pBuf: Received data buffer.
Requestno: Number of bytes to be read.
Outputs: No_read: Number of bytes effectively read. If this number is less than the number requested, the
end of the file was reached.
REMARKS The data are read from the current position of the file pointer. The file pointer is
automatically repositioned after the read.
Programming error causing a CPU fault
Access to a prohibited address:
- *pBuf parameter error,
- *pBuf+Requestno outside authorised area,
- *No_read parameter error.