One control engineer, one live outage on a power plant's transformer bank, no vendor ticket, no 2 a.m. page to the one person who usually knows how.
A 450 MW combined-cycle plant feeding the grid through a step-up transformer bank. Aveva Historian logs everything on it — required reading for NERC CIP compliance, not just operations. Tonight it's one control engineer covering the whole site, and the admin who usually untangles Historian problems is on vacation.
At 02:14, an alarm fires: Historian stops storing tags from the transformer bank. Not a safety event — but a blind spot during a demand peak the grid operator is watching, with a compliance clock quietly running underneath it.
Every read is automatic and local. The one step that changes something on the server is flagged, and waits for a yes. →
Plain language — no log paths, no vendor jargon.
Parses the Historian log locally, in seconds.
Read-only disk check finds the runaway log.
Approved, then confirmed with a read-only query.
The engineer never left the terminal, never escalated, and never sent a byte of plant data anywhere it shouldn't go.
The fix and the reasoning behind it are sitting in the session transcript — it becomes the runbook entry for the next engineer who hits the same alarm, senior admin or not.
An engineering estimate, not a lab result — every plant, historian, and failure mode differs. It's the shape of the problem Rung is built to compress.
| Criteria | Without Rung | With Rung |
|---|---|---|
| First look at the logs | ✕15–30 min opening ArchestrA logs by hand | ✓Under a minute — parsed and summarized automatically |
| Who's needed | ✕Often the one person who "knows the historian" — not always on shift | ✓Whoever is on duty, on the terminal they already have |
| Escalation path | ✕Page a senior admin, or open a vendor ticket (hours, per typical SLA) | ✓None required for this incident |
| Data leaving the site | ✕Sometimes — log excerpts pasted into a ticket or a general AI chat tool | ✓None — diagnosis runs locally, read-only by default |
| Compliance exposure | ✕Risk of a NERC CIP data-retention gap needing formal reporting | ✓Resolved inside the safe window |
| Total time to resolution | ✕60–120+ min, sometimes into the next shift | ✓11 min |
This is a composite scenario grounded in real Historian failure modes, not a specific customer's numbers — every plant and incident differs. A control engineer is commonly a six-figure loaded resource on a site where an hour of blind spot during a demand peak carries real risk; the value here is measured in time and exposure avoided, not a fabricated dollar figure.
Install Rung today, or talk to us about a design partnership for your site.