Technical Reference Manual - InduSoft

Tags and the Project Database
Changing How Boolean Tags Receive Numeric Values
By default, if any numeric value other than 0 (i.e., ≠0) is written to a Boolean tag, then the tag automatically
assumes a value of 1. You can change this behavior, if necessary, by editing the project_name.app file to
change the following setting:
[Options]
BooleanTrueAboveZero=value
If BooleanTrueAboveZero is set to the default 0, then the project will behave as described above. If
BooleanTrueAboveZero is set to 1, then the project will behave as follows:
• When you write any numeric value less than or equal to 0 (i.e., ≤0) to a Boolean tag, the tag assumes a
value of 0 (false).
• When you write any numeric value greater than 0 (i.e., >0) to a Boolean tag, the tag assumes a value of 1
(true).
Caution: This is a global runtime setting. If you only want to change how certain tags are handled,
then you should not change this setting.
Choosing the Tag Scope
IWS allows you to decide whether a tag "lives" on the project server or on each local station:
• Server (default): The tag is maintained on the project server and it's shared by all connected clients (e.g.,
Thin Client, Secure Viewer). A change to the tag value affects the entire project.
• Local: A virtual copy of the tag is maintained separately on each local station (server + clients), and a
change to the tag value affects only the station on which the change was made.
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