Automatic control function programming manual ladder language

Programming in C Language
REMARKS If the filename already exists, the function returns error code «UF_ERRNAME». An
existing file must first be deleted by function «USER_REMOVE_F» before the name
can be reused for another file.
After execution of function «USER_CREATE_F», the new file is empty. Function
«USER_CREATE_F» is only used for data files. Function «USER_CREATE_F»
does not automatically open the file. To open it, use function «USER_OPEN_F».
Programming error causing a CPU fault
Access to a prohibited address:
- *pfilename parameter error.
Delete a File USER_DELETE_F
Syntax
Parameters
SINT32 USER_DELETE_F(SINT8 *pfilename)
Inputs: pfilename: The path must not be specified because the user files are necessarily stored in a
particular directory.
Output: None
REMARK If a file is always open, it is not deleted.
Programming error causing a CPU fault
Access to a prohibited address:
- *pfilename parameter error.
Open a File USER_OPEN_F
Syntax
Description
SINT32 USER_OPEN_F(UINT32 *pF_id, SINT8 *pfilename)
Opens the file identified by pfilename. This file is accessible for read and write. If the operation is executed normally,
the file manager returns an identifier pF_id used by functions «USER_CLOSE_F», «USER_READ_F»,
«USER_WRITE_F» and «USER_SEEK_F».
Parameters
Inputs: pfilename: The path must not be specified because the user files are necessarily stored in a
particular directory.
Output: pF_id: File identifier if the operation was correctly completed.
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