contains PERSISTENT data [...] header in the data
_READ4 (FunctionBlock) SDO_READ_DATA [...] _WRITE4 (FunctionBlock) SDO_WRITE_DATA
slave output data max [...] slave input data max
address itemType PlcData [...] released by calling SysMemFreeData
data to the serial [...] the data to write
, where the data has to [...] data udiValue UDINT