Technical Reference Manual - InduSoft

Tags and the Project Database
Configure the parameters as follows:
• Alarms Enabled checkbox: Click (check) to enable checking according to configuration.
• Remote Ack tag field: Type a tag to enable remote alarm acknowlegement, which occurs when the tag values
change.
• Translation Enabled checkbox: Click (check) to enable the translation of messages defined on the Options tab
in the Project Settings dialog. For additional information about translations, see Translation Tools.
Note: IWS saves Alarm messages with the Translation Enabled attribute enabled in a file called
Alarm.TXT located in your project's \DATABASE\ directory.
• Off checkbox: Click (enable) to generate an alarm message always when the tag value is zero.
• On checkbox: Click (enable) to generate an alarm message always when the tag value is one.
• Changed checkbox: Click (enable) to generate an alarm message always when the tag value changes.
• Text value pane: Use the Off, On, and Ack fields to configure mnemonics (for example, Closed or Open) for the
Off, On, and Ack alarm states (Boolean tags only). During runtime, the Alarm Control object will display
this text in the Value column of the alarm message. You can also access this text using the tag fields.
Note: If you do not configure a mnemonic, the Alarm Control object displays the tag value (0 or
1) in the Value column.
Using Tag Properties: History
Use the Tag Properties dialog to view the history for a selected tag. IWS disables this command if there are
open trend worksheets. Before using this dialog, you should have already created the trend groups.
Note: History does not support string-type tags. See Recipes folder for information about storing
string values.
Integer and Real Type History
From the Tag Properties dialog, enable history for integer and real-type tags as follows:
• History Enabled checkbox: Click (check) to enable storage of the selected tag value samples.
• Group Number field: Specify the group number to which this tag is associated.
• Log Dead Band field: Specify a value sample taken when the variation value is equal to, or greater than, the
Log Dead Band.
Boolean Type History
From the Tag Properties dialog, enable history for Boolean-type tags as follows:
• History Enabled checkbox: Click (check) to enable storage of the selected tag value samples.
• Group Number field: Specify the group number to which this tag is associated.
List of Tag Properties
Tag properties (also known as "tag fields") are metadata attached to each tag in the database. Most of these
properties can be set using the Tag Properties dialog, which you can open by clicking the Tag Properties button
on the Tag Properties toolbar.
To access a tag property during runtime, use the following syntax (without spaces) anywhere that you would
normally specify a tag:
tag_name->property_name
You can access the following tag properties during runtime:
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