Understanding Results
Reading Your I/O List
Excel Export Columns
Your exported I/O list contains these columns:
| Column | Description |
|---|---|
| Tag Number | The instrument's unique identifier (e.g., FIT-101) |
| Instrument Type | ISA 5.1 letter code (e.g., FIT = Flow Indicating Transmitter) |
| Signal Class | AI (Analog Input), AO (Analog Output), DI (Digital Input), DO (Digital Output), or REVIEW |
| Description | What the instrument measures or controls |
| Page | Which P&ID page the instrument was found on |
| Confidence | AI confidence score from 0.0 to 1.0 |
| Review Status | Whether the instrument has been reviewed/edited |
Signal Classes Explained
- AI (Analog Input) — Transmitters that send continuous signals (4-20mA). Examples: PT, FIT, LT, TT
- AO (Analog Output) — Controllers that send continuous control signals. Examples: FIC, PIC, LIC, TIC
- DI (Digital Input) — Switches that send on/off signals. Examples: PSH, FSL, LSH, ZSO
- DO (Digital Output) — Valves and solenoids that receive on/off commands. Examples: XV, SOV, MOV
- REVIEW — Instruments that need manual classification (indicators, gauges, recorders)
Summary Sheet
The second sheet in the Excel export contains:
- Total instrument count
- Breakdown by signal class (how many AI, AO, DI, DO, REVIEW)
- Count of instruments needing review (low confidence)