CALL "SWR_START"
AG_KENNUNG :='A'
DB_WORK_NO :=DB1
DB_SEND_NO :=DB2
DB_RCV_NO :=DB3
MPI_ADR :=3
LADDR :=512
VERB_ID :=1
DP_MASTER_SYS_ID:=1
DB_COM_NO :=DB5
DP_KOMMUN :=1
ADR_MODUS :=1
PAA_FIRST :=0
PAA_LAST :=31
MB_NO :=30
MB_LEN :=0
IEC_NO :=0
IEC_LEN :=0
DB_NO :=21
DB_NO_LEN :=80
SLAVE_NO :=4
SLAVE_LEN :=1
SLAVE_DISTANCE :=1
DB_A_B_NO :=DB11
DB_A_B_NO_LEN :=W#16#0
DB_B_A_NO :="WINCC_DO_OUTPUT"
DB_B_A_NO_LEN :=W#16#0
RETURN_VAL :=MW2
EXT_INFO :=MW4
谁能分条告诉什么意思？？？？？？？？？