Function Call in ST

READ_OUTPUT
     (EN  := READ_OUTPUT_EN,
     SLOT := READ_OUTPUT_SLOT,
     SLV  := READ_OUTPUT_SLV,
     DATA := ADR(READ_OUTPUT_DATA));


READ_OUTPUT_DONE:= READ_OUTPUT.DONE;
READ_OUTPUT_ERR := READ_OUTPUT.ERR;
SYSDIAG_ERNO:= SYSDIAG.ERNO;
READ_OUTPUT_DATA_LEN:= READ_OUTPUT.DATA_LEN;