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PI Interface for OPC Alarms and Events

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Buffering services

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  • Last UpdatedOct 20, 2026
  • 1 minute read

The PI System offers two services to implement buffering at interfaces:

  • PI Buffer Subsystem (PIBufss)

  • API Buffer Server (Bufserv)

PI Buffer Subsystem is the best option for most environments.

Use API Buffer Server only if one or more of the following conditions is true:

  • The version of PI Data Archive receiving the buffered data is earlier than 3.4.375

  • Your interfaces run on a non-Windows platform

If any of the above conditions apply to you, see the PI Buffering Manager Help (PIPC/HELP/ BufferManager.chm) documentation for PI Server. Otherwise, use PI Buffer Subsystem.