How can I create links between I/O tags and objects already added to the screen, at runtime?
Solution:
To do so, use the object’s CreateLink method.:
CreateLink (Property, Source[, Type])
Where:
- Property: name of the property for which the link will be created
- Source: name of the link’s source object
- Type (optional): type of link to be created. When this parameter is omitted, a simple link will be created
Available options for Type parameter:
0 – Simple Link: source value is copied to the property whenever it is modified.
1 – Bidirectional Link: same as above; however, if the property changes, its value is copied to the source, thus generating a bidirectional link.
2 – Analog Link: establishes a conversion scale between the source’s variable and the property.
3 – Digital Link: fixed or alternant values are specified for the property, and they are attributed according to the source (true or false).
4 – Table Link: where conditions between variable, values, and destination can be established. Minimum and maximum values are specified on the table, in addition to other settings.
5 – Reverse Link: this is a unidirectional link from property to source.
6 – Multiple Link: this is similar to a table link, except that each line on the link is able to retrieve value from a different source.
Sample script between a screen display and a demo tag, creating a simple link:
