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.

  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 OSIsoft applications.

For more information regarding digital states, refer to the PI Data Archive installation and upgrade user guide.