OPC Data Point Filters
In the Multi Datachange Trigger and the OPC Read Multiple Transfer Object, it is possible to create filters for data points in order to control exactly which data points are to be read.
Filter Types
| Filter Type | Explanation |
|---|---|
| Contains | This filter applies if the path or name of the data point contains this value. |
| Equals | The filter applies if the path or name exactly matches the filter. |
| Regex | The filter applies if the regex expression is found in the path or name. |
Configuration options
Exclude filter only (default)
Recommended if, with a few exceptions (e.g., subdirectories), values are to be read from all data points.
If only the exclude filter is active, all data points that are not excluded by the exclude filter are read.
With this filter, values are read from all data points whose path or name does not contain "_Statistics," "_System," or "_Hints."
Include filter only
Recommended if values from specific data points or subdirectories are to be read selectively from a set of data points.
If only the include filter is active, all data points to which at least one of the include filters applies are read.
With this filter, only values from data points whose path or name contains the word "temperature" would be read.
Include and exclude filters in combination
Recommended if values from specific data points or subdirectories are to be selectively read from a set of data points, with some data points or subdirectories additionally to be excluded.
If both filters are active at the same time, all data points to which the include filter applies are read, minus the data points that are excluded by the exclude filter.
With these filters, only values from data points containing the word "machine" would be read, but only if they do not contain the word "machine12".
Testing and previewing filters
The "Data Point Preview" button opens an overview of the data points that would be read at runtime.
