PI Source

The PI Source node reads data from an OSI PI Historian Server.

Configuration

Basic

Group By Granularity Mode

Use End

The data of the containing data points will be timestamped at the end of the configured granularity.

Use Start

The data of the containing data points will be timestamped at the beginning of the configured granularity.

Data Granularity

Represents the granularity within a data group. For Example: The Data Group has a time range from 01:00 - 02:00 (Granularity 1h) The node fetches data for every 5 min within tha data group range: 01:05, 01:10, 01:15….

Data Retrieval

Retrieval Mode

Recorded Value

Retrieves only recorded values. Provides additional options.

Interpolated Value

Retrieves interpolated values for the provided timestamps.

Recorded Value Mode

Additional configuration option for Retrieval Mode: Recorded Value

Auto

Automatically determine the best retrieval mode.

At Or Before

Return a recorded value at the passed time or if no value exists at that time, the previous recorded value.

Before

Return the first recorded value before the passed time.

At Or After

Return a recorded value at the passed time or if no value exists at that time, the next recorded value.

After

Return the first recorded value after the passed time.

Exact

Return a recorded value at the passed time or return an error if none exists.

Filter Expression

Additional configuration option for Retrieval Mode: Interpolated Value A filter expression that follows the performance equation syntax.

Include Filtered Values

Additional configuration option for Retrieval Mode: Interpolated Value Specify true to indicate that values which fail the filter criteria are present in the returned data at the times where they occurred with a value set to a “Filtered” enumeration value with bad status. Repeated consecutive failures are omitted.

Connection

PI Connection

Select a PI Configuration configured in the Global Configurations

Signals

Define the signals to retrieve from the PI Historian.

Signal Name

The name of the requested signal in the PI Historian

Flow Name (Optional)

The name of the signal in the node output, visible in subsequent nodes. If this field is empty the Flow Name is the same as the Signal Name