ISPSoft User Manual If the same operation is required, and a different memory block is also required, users can make use of the characteristic of a function block instance. After a different symbol is declared for a function block which requires a different memory block, the system will regard the different symbol as a different function block instance. When the program is compiled, a different memory block is assigned to the different function block instance. As shown in the figure below, only the function block definition is under Function Blocks in the project management area before the program in the project is compiled.
After the program is compiled, the function block instances will be under the function block definition. The format of a function block instance is Instance name[POU name] . 7-20