Segment : POINTER TO BYTE; udiSize [...] String.GetSegment(udiSize=>udiSize [...] present udiSize = 128
_udiMaxIndex] OF __XWORD; udiSize [...] 内存的处理(例如类型 ARRAY OF BYTE [...] ..32] OF BYTE
在数字范围内 UDINT (4 ≦ udiSize [...] .IString; udiLength, udiSize [...] String.GetSegment(udiSize=>udiSize