There are three types of rules for the elements of the OPC server of the Data Access standard:

1. Change the state of an element when an element accepts a value from a certain range.
2. Set the specified value to an element from the map (see Working with OPC-server elements of Data Access standard on the map).
3. Change the state of the indicator when an element accepts a value from a certain range (see Working with OPC-server elements of Data Access standard on the map).

You can configure rules on the basis of the OPC DA State rule object that is created on the basis of the OPC Wrapper object. This object is a group of rules that can include rules of all types. You can assign only one group of rules to each element of the OPC server of the Data Access standard.