Chapter 15 Continuous Function Charts Method 2: Keyboard Type an instruction in the function block definition box, and press Enter on the keyboard, or click OK . If users move the mouse cursor and click where you’d like to add the function block, the function block will be inserted. (The function block that users type in is not case-insensitive. If the users type an incorrect function block, or an incorrect device name, an error message will appear after they click OK .), as the image shown below. 15-15