Function Call in ST

WRITE_SD(EN := EN_SD_WRITE,
     ATTRIB := ATTRIB_SD_WRITE,
     FILENO := FILENO_SD_WRITE,
     SEG := SEG_SD_WRITE,
     FORMAT := FORMAT_SD_WRITE,
     NVAR := NVAR_SD_WRITE,
     ADRVAR := ADRVAR_SD_WRITE);
DONE_SD_WRITE := WRITE_SD.DONE;
ERR_SD_WRITE := WRITE_SD.ERR;
ERNO_SD_WRITE := WRITE_SD.ERNO;