Digital States 20 System Digital State Set Similar to digital state sets is the system digital state set. This
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.
PI Interface for Bailey Infi90 21Chapter 6. PointSource The PointSource is a single, unique character that is used to identify the PI point as a point that belongs to a particular interface. For example,
the letter R
may be chosen to identify points that belong to the
MyInt interface. To implement this, set
the PointSource attribute to R
for every PI point that is configured for the
MyInt interface. Then,
/ps=Ris used on the startup command-line of the
MyInt interface, the interface will search the PI Point Database upon startup for every PI point that is configured with a PointSource of R. Before an interface loads a point, the interface usually performs further checks by examining additional PI point attributes to determine whether a particular point is valid for the interface. For additional information, seethe
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