Chapter 7 Function Block and Library 2x10 13 Bytes The calculation for the example is as follows. Function block instance INS_A 4 Bytes (DWORD x 1), total 5 (Bytes) Function block instance INS_B 8 Bytes (LREAL x 1), total 8 (Bytes) Function block instance INS_C1/INS_C2 In BOOL array. The BOOL element in each array is fixed to occupy 1 Byte. Calculation are as followed. 2 Bytes (BOOL array x 1, length is 2), total is 2; function block C produces 2 instances in total. So, the two function block instances total is 2x2=4 (Bytes) i. In short, the total memory size of the occupied section that corresponds to the function block is 5+8+4=17 (Bytes). 7-31