Icons Section 4 Engineering Interface48 3BSE042835-600A control module type that represents the interaction window should contain arectangle with the following properties:• Line color: -3 (Foreground color)• Area color: -1 (Transparent)This means that the area in the window will have window background color. It alsomeans that the window border is visible in layer 2 of the control module.Interaction object in layer 1A non-visible interaction object should be somewhat smaller than the iconrepresenting it. The reason is that the frame that indicates interaction should beclearly visible.TextsText boxes should be used instead of vertical text lines to display variables.Otherwise the text may overwrite other graphical objects. The text box should bemade wide enough for the text size to be determined by the height of the text box. Itis then easier to combine it with text in other text boxes.Texts that are too long will cause font reduction for text boxes. For text lines the fontwill remain constant, which means that the text will not fit in the operator window,which is worse than font reduction. Therefore text boxes should be used instead oftext lines for presentation of variables in operator windows.Even though it is possible for an operator to zoom the module, the operator must beable to control it without using zoom. The zoom facility is only intended forprogrammers and service personnel.IconsIcons are used to distinguish objects, for example control modules and interactionbuttons, and to indicate their functionality.For display elements icons and display element reduced icons, which are used whenbuilding graphics displays for operators.