MVME7100-0173工控备件模块
将显示“桌面首选项”对话框。“桌面首选项中的项目更新”选项指定在项目集窗格更改时如何更新项目集窗格中显示的值。该设置实际上是默认值，可以由每个项集中的相应属性覆盖。更改的原因多种多样，但最常见的是在浏览参数和信号时在浏览树窗格中进行选择更改。参数、信号和故障4-140 DriveWindow 2您必须选择其中一个选项：•从OPC服务器缓存中获取项目值。例如，如果您正在进行快速监控，则建议使用此选项以减少通信流量。然而，显示的项目值可能很旧。•项目值从驱动器获取（默认选项）。此选项引起的意外最少，因为在项目集窗格中进行更改后，您总是会看到新的值。在这种情况下，很少需要update命令。请注意，锁定项目的值也会更新。•项目值已联机。此选项会导致大量通信流量，我们建议您谨慎使用。桌面首选项还允许您以与驱动器的操作员面板显示的格式相同的格式显示和打印项目值（驱动器参数）。该选择还影响趋势显示窗格中图形光标显示的未缩放值以及驱动器或所有驱动器的参数打印。不幸的是，操作员面板格式仅适用于新驱动器。但是，用户可以临时覆盖选定项目的显示格式（请参见更改项目值的显示格式）或图形光标值（请参见改变图形光标值的显示形式）。用户定义的项集中的每个模板也可以永久指定使用特定格式。对于项目集，该设置实际上是一个默认值，可以由使用该设置的每个项目集中的相应属性覆盖。选择“状态刷新”涉及在打开状态刷新时刷新浏览树窗格中显示为图像的驱动器的状态。选项包括：•仅刷新所选驱动器的状态图像。请注意，同样的图像也显示在状态栏中。如果有大量驱动器，则使用此选项，在这种情况下，刷新所有驱动器的状态可能会导致通信负载过重。•刷新所有驱动器的状态映像。这是通常使用的选项。请注意，即使状态刷新处于关闭状态，也会在浏览树窗格和驱动器面板工具栏中始终刷新驱动器的状态图像（对其进行控制）。请注意，尽管在DriveWindow会话之间保留桌面首选项中的状态刷新设置，但也会将其保存并与工作区一起恢复。但是，从工作空间文件恢复的值仅在工作空间打开时有效。当您重新启动DriveWindow时，您在桌面首选项中所做的上次状态刷新设置将再次生效。选择项目名称允许您指定用户定义的项目集的名称列中项目名称的显示方式。该设置是默认值，可以由每个用户定义的项集中的相应属性覆盖。
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.
