Configure retrieval options

You can define data retrieval options at the application level. These options are used for all tags that do not have their own settings defined.

Application-level retrieval options are not saved in trend files. Therefore, trend files with tags that rely on application-level retrieval settings may look different depending on the retrieval options that are configured in the Trend application that they are opened in. To make sure that your tags are using specific retrieval options, define these options individually for each tag. For more information, see Configure trend options for a tag.

Most retrieval settings that you configure here only apply if you are retrieving data from a Historian with a version of 9.0 or later. If you are using an earlier Historian version, see Configure other options and Work with retrieval styles for details.

To configure retrieval options

1. On the Tools menu, click Options. The Options dialog box appears with the Retrieval tab selected.

   

2. Do one of the following:

   • To use a predefined retrieval style, click its name in the Retrieval style list. For more information on retrieval styles, see Work with retrieval styles.

   • To use custom retrieval settings, click Custom style in the Retrieval style list.

3. Specify any additional settings required.

   • If you are using custom retrieval settings, select a retrieval mode and specify all the settings that are relevant to it. For more information, see Understanding Retrieval Modes.

   • If you are using one of the predefined styles, you can edit all settings that are not covered by the style definition. For information on which settings are covered by style definitions, see Work with retrieval styles.

     Because a style definition can contain multiple sets of retrieval settings with different retrieval modes, some of the settings available for editing here may turn out to be irrelevant for the retrieval mode that actually gets used for a given query. However, because there is no way to know in advance whether this will be the case, the settings are still available for editing.

     For more information on the various retrieval options, see Understanding Retrieval Options.

By default, the retrieval settings that you specify here are used for all tags on all trend charts. However, you can override these settings individually for each tag. For more information, see Configure trend options for a tag.