Automatic control function programming manual ladder language

Programming error causing a CPU fault
Access to a prohibited address:
- *pOld_Ptr parameter error.
16.4.9.12 Directory Management
Only the user directory is accessible. Three primitives are available to read the contents of this directory.
Open User Directory USER_OPEN_DIR
Syntax
Parameters
Inputs: None
Outputs: None
REMARK A directory is open for read only.
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SINT32 USER_OPEN_DIR()
Close User Directory USER_CLOSE_DIR
Syntax
SINT32 USER_CLOSE_DIR()
Description
Closes the user directory opened by the primitive «USER_OPEN_DIR».
Parameters:
Inputs: None
Outputs: None
Read User Directory USER_READ_DIR
Syntax
SINT32 USER_READ_DIR(UINT8 *pBuf, UINT32 No_Requested, UINT32*No_Read)
Parameters
Inputs: pBuf: Data receive buffer.
No_Requested: 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 directory was reached.