Tycho Data Announces Data Quality for PI Vision Displays

PI Vision displays are often the final interface between PI data and the person making a decision. Display reliability therefore requires more than checking whether the page loads.

Teams need visibility into the health and source of the data behind each important display.

Check source freshness

A value can remain visible after the source stops updating.

For important signals, compare the last update with the expected update interval. Make stale conditions visible to administrators and, where appropriate, to display users.

Check bad states and gaps

Review whether the underlying PI Points contain bad states or missing periods that can affect trends and calculations.

A current good value does not prove that the full historical period is complete.

Check AF mappings

If a display uses AF, confirm that attributes point to the intended tags and servers.

This is especially important after migrations, template changes, and equipment replacement.

Check analysis health

Calculated values can remain stale or misleading when an analysis fails.

Monitor important analysis status and trace the inputs used by the displayed result.

Track display dependencies

Maintain an inventory of which tags and AF attributes each display uses.

This supports impact analysis before tag cleanup, server retirement, and AF changes.

Review high-value displays first

Focus validation on displays that support operations, reliability, production, environmental reporting, and critical maintenance decisions.

Define an owner for these displays and review them after material upstream changes.

Expose trust context

A display trust indicator can show whether defined checks passed and provide access to source, data-quality, and change information.

The status must have a clear definition. It should not imply that the underlying physical measurement has been independently calibrated or certified.

The practical objective

PI Vision data quality means that users can see whether the displayed information is current, connected to the correct source, and supported by healthy upstream calculations and data.