CAAPE User's Manual - ALSTOM Signaling Inc.

Using CAAPE Graphics6.5.1.2. CommentsComment are text-only statements that are used to document the logic but do not affectits operation. Multiple lines of text can be entered.6.5.1.3. Group RecordsA group record gives a user-entered name to a related group of logic statements. Eachgroup record has a corresponding Group End statement; any statements between thegroup record and the group end are considered part of the group. Group records areuseful for identifying groups of statements that should be manipulated as a unit. All thestatements in a group can be moved, copied or deleted at once. Like comments, grouprecords do not affect logic operation.6.5.1.4. Function StatementsFunction statements are text-only statements that represent various types of specializedor advanced operations in the application logic. Two important categories of functionstatements are VPI Library statements and the advanced programming statements inCTC2.These statements are just entered as text, and are displayed that way in the ladder logicediting screen.When function statements such as IF, ELSE or WHILE enclose blocks of statements,the enclosed logic block must end with an END BLOCK function statement.6.5.2. Caret PositioningA flashing caret symbol indicates the current active editing position. As in a text editor,the caret position can be changed by clicking on the screen, using the arrow keys, etc.When the caret is placed over a display item on the screen, various editing functions areenabled. For example, when the caret is placed over a branch on a Boolean equation,insertion of parallel branches and parameters is possible. The editing functions allowedat the current caret position are enabled in the main and popup menus and the logictoolbar, and hotkeys for performing the functions are enabled as well.6.5.3. General Editing Techniques6.5.3.1. Using Hotkeys and the Hotkey BarHotkeys are available for various editing functions depending on the caret position. TheHotkey Bar lists the hotkeys that are available to use on the data at the current caretlocation. Its contents change as the caret is moved over different types of logic displayitems.The View | Hotkey Bar main menu item can be used to show or hide this bar.P2512A, Rev. Oct/09 6–21 Alstom Signaling Inc.