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There are 3 types of rules for OPC-server elements of Data Access standard:

  1. Change of element state while taking the element a value from the specified range.
  2. Set the specified card value to the element (see the Working with OPC-server elements of Data Access standard on the map section).
  3. Change of indicator state while taking the element a value from the specified range (see the Working with OPC-server elements of Data Access standard on the map section).

Configuring of rules is performed on the basis of the OPC DA State rule object which is created on the basis of the OPC Wrapper object. This object is a group of rules in which rules of all types can enter. Only one group of rules can be specified to each OPC-server element of Data Access standard.

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