UniInt End User

PI Point Configuration What are PI Points?

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PI Point Configuration What are PI Points? The PI point is the basic building block for controlling data flow to and from the PI Data Archive. Whereas a point in geometry has coordinates associated with it that define its position in space, a PI point has attributes associated with it that determine the source and destination of data, the means by which the data is transmitted, how the data is stored in PI, etc. A single point is configured for each measurement value that needs to be archived. For example, one point can be configured to store temperature readings from a thermocouple. Another point could be configured to store temperature readings from a second thermocouple. The purpose of most UniInt based interfaces is to move data from a device to PI and, to a lesser extend, to move data from PI to a device. OSIsoft publishes more than 400 standard interfaces to PI so the list of devices is long on diverse. Each interface uses specific PI point parameters for configuring data collection on a per point basis. The interface manual will have to be consulted for information on a specific interface. This section will list the attributes that are common to most interfaces. Each interface is different so check the interface manual to ensure the interface does not deviate from the standard use of these attributes. Points for UniInt-based interfaces can be split into two broad classes: interface points and UniInt points. Interface points are the main means of controlling data transfer for an interface. As the name implies, the configuration of interface points depends upon the interface in question. UniInt points are used exclusively by UniInt for moving standard data such as I/O Rates, performance and health monitoring information, or control points such as Failover Control points (UniInt failover is discussed starting on page 75). Interface Points Interface points can be subdivided into input points and output points. A PI point is called an input point when the flow of data is from some external source to the PI Data Archive specified with the /host command-line parameter. A PI point is called an output point when the flow of data is from the PI Data Archive to a destination that is external to the Archive. The mechanism for determining which points are input points and which points are output points is specific to each interface. Please consult the interface user’s manual for detailed discriptions of the PI point attributes that are relavant to the interface. The following section describes common point attributes. The second and third sections describe how input and output points are configured and used. Download 1.93 Mb. Share with your friends: