Digital states

PI digital states are discrete values represented by strings.

• Digital State Sets

  Strings are organized in PI as digital state sets. Each digital state set is a user-defined list of strings, enumerated from 0 to n to represent different values of discrete data. For more information about PI digital tags and editing digital state sets, see the PI Data Archive user guide.

  An interface point that contains discrete data can be stored in PI as a digital point. A digital point associates discrete data with a digital state set, as specified by the user.

• System Digital State Sets

  Similar to digital state sets, the system digital state set is used for all points, regardless of type, to indicate the state of a point at a particular time. For example, if the interface receives bad data from the data source, it writes the system digital state Bad Input to PI instead of a value. The system digital state set has many unused states that can be used by the interface and other PI clients. Digital states 193-320 are reserved for AVEVA applications.

For more information regarding Digital States, refer to the PI Data Archive documentation in the PI Server user guide.