MVME7100-0173工控備件模塊
將顯示“桌面首選項”對話框。“桌面首選項中的項目更新”選項指定在項目集窗格更改時如何更新項目集窗格中顯示的值。該設置實際上是默認值，可以由每個項集中的相應屬性覆蓋。更改的原因多種多樣，但最常見的是在瀏覽參數(shù)和信號時在瀏覽樹窗格中進行選擇更改。參數(shù)、信號和故障4-140 DriveWindow 2您必須選擇其中一個選項：?從OPC服務器緩存中獲取項目值。例如，如果您正在進行快速監(jiān)控，則建議使用此選項以減少通信流量。然而，顯示的項目值可能很舊。?項目值從驅動器獲?。J選項）。此選項引起的意外最少，因為在項目集窗格中進行更改后，您總是會看到新的值。在這種情況下，很少需要update命令。請注意，鎖定項目的值也會更新。?項目值已聯(lián)機。此選項會導致大量通信流量，我們建議您謹慎使用。桌面首選項還允許您以與驅動器的操作員面板顯示的格式相同的格式顯示和打印項目值（驅動器參數(shù)）。該選擇還影響趨勢顯示窗格中圖形光標顯示的未縮放值以及驅動器或所有驅動器的參數(shù)打印。不幸的是，操作員面板格式僅適用于新驅動器。但是，用戶可以臨時覆蓋選定項目的顯示格式（請參見更改項目值的顯示格式）或圖形光標值（請參見改變圖形光標值的顯示形式）。用戶定義的項集中的每個模板也可以永久指定使用特定格式。對于項目集，該設置實際上是一個默認值，可以由使用該設置的每個項目集中的相應屬性覆蓋。選擇“狀態(tài)刷新”涉及在打開狀態(tài)刷新時刷新瀏覽樹窗格中顯示為圖像的驅動器的狀態(tài)。選項包括：?僅刷新所選驅動器的狀態(tài)圖像。請注意，同樣的圖像也顯示在狀態(tài)欄中。如果有大量驅動器，則使用此選項，在這種情況下，刷新所有驅動器的狀態(tài)可能會導致通信負載過重。?刷新所有驅動器的狀態(tài)映像。這是通常使用的選項。請注意，即使狀態(tài)刷新處于關閉狀態(tài)，也會在瀏覽樹窗格和驅動器面板工具欄中始終刷新驅動器的狀態(tài)圖像（對其進行控制）。請注意，盡管在DriveWindow會話之間保留桌面首選項中的狀態(tài)刷新設置，但也會將其保存并與工作區(qū)一起恢復。但是，從工作空間文件恢復的值僅在工作空間打開時有效。當您重新啟動DriveWindow時，您在桌面首選項中所做的上次狀態(tài)刷新設置將再次生效。選擇項目名稱允許您指定用戶定義的項目集的名稱列中項目名稱的顯示方式。該設置是默認值，可以由每個用戶定義的項集中的相應屬性覆蓋。
The Desktop Preferences dialog box is displayed. The selection Item Update in Desktop preferences specifies, how to update the values shown in the item sets pane, when the item sets pane changes. The setting is actually a default value and can be overridden by the corresponding property in each item set. The causes of changes are various, but the most common is making a selection change in the browse tree pane while browsing parameters and signals. Parameters, Signals, and Faults 4-140 DriveWindow 2 You have to select one of the options: ? The item values are fetched from the OPC Server cache. This option causes least communication traffic and is recommended, if you are doing fast monitoring, for example. However, the item values shown can be very old. ? The item values are fetched from drives (default option). This option causes least surprises, because after changes in the item sets pane you always see fresh values. The update command is seldom needed in this case. Note that also values of locked items are updated. ? The item values are put on-line. This option causes much communication traffic and we recommend that you use it sparingly. Desktop preferences also allow you to display and print item values (drive parameters) in the same format as the operator panel of the drive shows them. The selection also affects the unscaled values shown with the graph cursor in the trend display pane and printing of parameters of a drive or all drives. Unfortunately, the operator panel format is only available in new drives. However, the user can temporarily override the display format of selected items (see Changing Display Format of Item Values) or graph cursor values (see Changing Display Format of Graph Cursor Values). Each of the templates in a user defined item set can permanently specify to use a specific format, too. For item sets, the setting is actually a default value and can be overridden by the corresponding property in each item set that uses it. The selection Status Refresh concerns refreshing of the status of the drive displayed as images in the browse tree pane when status refreshing is on. The options are: ? Only the status image of the selected drive is refreshed. Note that the same image is also shown in the status bar. Use this option if there is huge number of drives, in which case refreshing status of all of them could cause too heavy communication load. ? Status images of all drives are refreshed. This is the option normally used. Note that the status image of the drive, control of which is taken, is always refreshed - both in the browse tree pane and in the drive panel toolbar - even when status refreshing is off. Note that although status refresh setting made in desktop preferences is preserved between DriveWindow sessions, it is also saved and restored with the workspace. However, the value restored from a workspace file is in effect only while the workspace is open. When you restart DriveWindow, the last status refresh setting that you made in desktop preferences is effective again. The selection Item Names allows you to specify, how the name of the item in the Name column of user defined item sets is displayed. The setting is a default value and can be overridden by the corresponding property in each user defined item set.
