The Alarm Analysis Report is an ISA-18.2 compliance tool built into Control Architect. It reads every alarm block configuration from the active MongoDB asset collection, evaluates each block against the ANSI/ISA-18.2-2016 standard, and produces a multi-worksheet Excel workbook that engineering teams can use for rationalization reviews, management reporting, and trend tracking.
What the Report Produces
Every generated report creates the following worksheets:
Worksheet
Purpose
Alarm Summary
Fleet-wide alarm type, priority and state counts. Includes an ISA-18.2 §5.3 / §5.6 compliance section with a Rationalization Score and trend indicators versus the previous collection snapshot.
ISA-18.2 KPIs
Structured compliance data rows — Critical%, Suppressed%, priority distribution benchmarks, completeness, and a PNG snapshot of the rationalization panel (export only).
Template Breakdown
Per-template ISA-18.2 §4.3 offender ranking. Each row is one Control Architect template, sorted worst-first by Rationalization Score. Includes a fleet Totals row.
Tpl Breakdown — Legend
Formula reference sheet documenting every computed column in the Template Breakdown worksheet.
Tag Data
One row per alarm block — all raw alarm parameters for every entity in the collection. This sheet is present in the exported Excel file only; it is not shown in the in-app spreadsheet viewer.
ISA-18.2 Compliance at a Glance
The report evaluates three key compliance dimensions from ANSI/ISA-18.2-2016:
§5.3 — Priority compliance: URGENT + EMERGNCY alarms as a percentage of total actionable alarms. Target ≤ 5% (site-configurable).
§5.6 — Suppression compliance: Disabled + Inhibited alarms as a percentage of total state alarms. Target ≤ 5% (site-configurable).
§4.3 — Rationalization completeness: Alarms with priority NOACTION or NONE that have not yet been assigned a rationalized priority.
All three dimensions feed a single Rationalization Score (0–100) with weighted deductions:
A consistent three-band colour scheme is used throughout all worksheets:
Color
Meaning
Green
Compliant — metric is within the ISA-18.2 target threshold.
Amber
Marginal — metric exceeds the threshold but remains within the configurable marginal band (default 2× threshold).
Red
Non-compliant — metric exceeds the marginal band. Immediate attention recommended.
Note Default thresholds: ISA Compliance Threshold = 5.0%, Marginal Threshold = 10.0%. Both values are site-configurable via Report Settings → ISA Compliance Threshold and are persisted to MongoDB per collection.
