Regarding the relationship between STEP7 DB blocks and WCC DB blocks
Thread Content
In step, there are only DB1 and DB2, but in WCC, it is connected to DB1.DD4, DB1.DD12, DB2.DW0, and DB2.DW4. What’s going on here?
In WCC, “DB1.DD4” refers to the fact that the address corresponding to this symbol is a 2-byte data type located at address 4 within the DB1 data block in the step. ““DB2.DW0” refers to the data type of a single word whose address corresponds to 0 in the DB2 data block within the step. 1 binary digit is called 1 bit, 8 binary digits are called 1 Byte; 8 bits = 1 Byte. A byte is equivalent to 1 Word (1 character, 16 bits); DWORD (Double Word) refers to two words, which means four bytes (32 bits). 2 bytes = 1 word = 16 binary bits
It is estimated that your DB1 and DB2 are the background data blocks of FB; each DB can store a large amount of data – for example, DB1.DD4 might be used to store a long integer or a real-number value.
Thank you. Why is it necessary in WCC to specify the data type of the data blocks corresponding to those in STEP7?