FUNCTION WDELETE : WSTRING(255)
Delete LEN wcharacters of STR, beginning at the POS-th character position. POS = 1 is the first character.
The current implementation is unfortunately not correct for the case Pos=0. The implementation cannot be changed for compatibility reasons.
If Pos=0 is used, the parameter LEN is internally reduced by one!
It is generally recommended to use values in the range specified by IEC 61131-3. The smallest value for Pos is specified there as 1.
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