Modbus has been used in recent work, so there are many arrays and strings, but they are not understood very much, so the process of understanding is recorded.
The use of the fill quality FILL_N directly in 200plc enables the emptying and assignment of multiple consecutive data.
There is similar processing in the 300PLC:
1. Use SFC21 (FILL_MOVE): to achieve the transfer of the source address to the destination address;
Example: CALL "FILL"//SFC21
BVAL :=P#M 0.0 INT 1
RET_VAL:=MW900
BLK :=P#M 10.0 INT 20
(Continuous transmission of MW10 to consecutive 20 INTs starting at MW10)
2. Use SFC20 (BLOCK_MOVE): to achieve replication of the source data DB and the target data DB.
For example: source data DB1 and target data DB2 creation
DB1 does not operate, so all are 0, use DBC20 to transfer DB1 to DB2
Call sfc21
Srcblk:=P#db1.dbx0.0 byte 1200
Ret_rel:=mw0
Dstblk:=p#db2.dbx0.0 byte 1200
About the use of strings
Can be used in 200PLC string
1. String connection instruction STR_CAT
Can input string (for example, display device name in hmi)
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