Chapter 11 Function Block Diagram (2) In addition to the structure in the figure above, users may be allowed to insert the mark S/R into another structure. If users are allowed to insert the mark S/R into the position selected, on the toolbar can be clicked. After users click , the mark S will be inserted. If the users click again, the mark R will be inserted. 11.2.7 API, Comparison Contact and Function Block In a function block diagram in ISPSoft, the applied instructions, the comparison contacts, and the function blocks are represented by blocks. Besides, users can type function block instances in the boxes above the function blocks.
If the logic state connected to the En pin of a block representing an applied instruction or a function block is ON, the applied instruction or the function block will be executed. A function block diagram is flexible in that users can put a logical operation, e.g. inverse logic or an AND/OR block, between two function blocks, between two applied instructions, or between a function block and an applied instruction in a network. Graphic representation 11-21