西门子1200 PLC CRC效验程序功能块

添加变量 #crc_v := word#16#FFFF; FOR #i := 0 TO #length - 1 BY 1 DO #crc_v := #crc_v XOR BYTE_TO_DWORD(“DB_CRC”.buffer[#db_offset + #i]); FOR #j := 0 TO 7 BY 1 DO IF ((#crc_v & 1) <> 0) THEN #crc_v := SHR

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