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PI Interface for Performance Monitor

Learn about status points

  • Last UpdatedJan 22, 2025
  • 1 minute read

Status points contain information about the state of a specified Windows performance counter. To verify that a Windows performance counter is active and returning good data to its data point, you can define a corresponding status point. Like data points, the ExDesc attribute of a status point contains the performance counter path of the counter being monitored. If you omit the name of the target computer, the default is localhost. The data type of a status point must be digital and its Location2 attribute must be set to 1. The status point must be assigned to the same scan class as its corresponding data point. Status points do impose an additional overhead on the network or target computer since it must be read twice.

To define the digital states that the interface uses for status tags, use PI System Management Tools to import the PI_PIPerfMon_DS.csv file, which reside in the interface installation directory (by default, %PIHOME% \Interfaces\PIPerfMon\).

If the performance counter is functioning correctly, the status tag is set to Good. If the interface cannot initialize the tag, it sets the tag to Configure. If the tag status is Configure, check its attributes to determine whether it is configured correctly.

Set the attributes of status tags as follows:

Tag Attribute

Setting

Location1

Interface ID

Location2

1

Location4

Scan class (1 or greater)

Point Type

Digital

DigitalSet

PIPerfMon

ExDesc (Extended descriptor)

Performance Counter Path

Span

11 (The number of the last digital state from the PIPerfMon digital state set.)

Step

1

Zero

0

TypicalValue

11

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