Interface to the pi system
Testing Connection to ICI
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- Digital States
- System Digital State Set
- System Digital States Written to Tags
Testing Connection to ICIBailey created a connection test utility called Talk90. This utility was distributed with the runtime kit in the past, but as of Bailey semAPI 2.0, it is no longer distributed in the runtime kit. It is still distributed with the supervisory control kit. Running the test utility looks similar to this:
Option: 100 Logical ICI: 1 Timeout is in seconds. Timeout: 5 Valid Users: 0 = SHARED 1 = EXCLUSIVE Type of User: 1 Tagnames: 0 = DO NOT RETURN TAGNAMES, 1 = RETURN TAGNAMES Tagnames: 0 Option 100 should be used to make sure that at least a connection to the ICI can be made. If the connection is not successful, Bailey should be contacted. Digital StatesFor more information regarding Digital States, refer to the Data Archive Manuals. Digital State SetsPI digital states are discrete values represented by strings. These 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 Server manuals. An interface point that contains discrete data can be stored in PI as a digital tag. A Digital tag associates discrete data with a digital state set, as specified by the user. A PI tag for the Station Status is normally defined as a digital point. A set should be defined with these states in this order:
System Digital State SetSimilar to digital state sets is the system digital state set. This set is used for all tags, regardless of type to indicate the state of a tag at a particular time. For example, if the interface receives bad data from an interface point, 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 Data Archive Manuals. System Digital States Written to TagsDuring normal operation, the interface may set the status of PI tags to a system digital state under the following circumstances:
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