Chapter 11 Function Block Diagram (2) There are three ways to insert an applied instruction, a comparison contact, or a function block in a function block diagram. Method 1 Unfold the APIs section or the Function Blocks section in the project management area, and find the item which will be inserted. Select the item, and drag it to the position in which it will be inserted. Function block definitions can be dragged, but function block instances can not be dragged. 11-23