SIS documentation, from your P&IDs.
Extract the candidate SIS instrument subset from P&IDs and cause and effect matrices. Annotated SIL, voting logic, ESD trip points and the BPCS and SIS markings the drawings carry, structured into an I/O list your safety engineer confirms before it goes into IEC 61511 and ANSI/ISA-84 work.
Three drawings included on a new account.
What SIS documentation captures.
Extract SIS tags, SIL ratings, voting logic, and ESD trip points from P&IDs and cause-effect matrices for IEC 61511 audit work.
Fields.
- Instrument tag and its signal classification (ZSH, ZSL, PSH, PSL, etc.)
- SIL rating where annotated on the drawing
- Voting architecture (1oo2, 2oo3, etc.) from the drawing symbol or annotation
- BPCS vs SIS domain assignment per instrument
- ESD loop number and associated final element tag
- Cause-effect matrix: initiator tag to final element cross-reference
- Trip-point annotation where present on the P&ID
Sample output.
Representative SIS rows from a process P&ID set. Values are illustrative.
| Tag | SIL (as annotated) | Voting | Final Element | Trip Class | PHA Item |
|---|---|---|---|---|---|
| XS-101A | SIL 2 | 2oo3 | XV-101 (ESD valve) | LL trip on level | LOPA Node 4 |
| PSH-201 | Review | 1oo2 | XV-202 (blowdown valve) | HH trip on pressure | LOPA Node 7 |
| TSH-301 | Review | 1oo1 | XV-301 (fuel shutoff) | HH trip on temperature | LOPA Node 12 |
| ZSL-401A | SIL 2 | 2oo3 | K-501 (compressor ESD) | LL position on valve | LOPA Node 15 |
| FSL-501 | Review | 1oo2 | XV-502 (flare isolation) | LL trip on flow | LOPA Node 18 |
| LSH-601 | SIL 2 | 2oo2 | XV-601 (tank overflow) | HH trip on level | LOPA Node 21 |
Source documents.
- P&IDs with SIS boundary markings (CAD-exported PDFs and scanned drawings)
- Cause-effect matrix drawings (ESD logic diagrams)
- Safety requirements specifications (SRS) uploaded as reference documents
- Existing SIS I/O lists uploaded as Excel ground-truth for gap analysis
Standards.
The exported columns use the vocabulary of IEC 61511-1:2016, IEC 61508-2 and ANSI/ISA-84.00.01, so the output reads in the terms your functional safety process already uses. ISA 5.1 and IEC 81346-2 cover the tagging conventions a drawing may follow, and IEC 61511-1 describes how a P&ID represents the boundary between the BPCS and the SIS.
That alignment is terminology. Which functions are safety instrumented, and what SIL each one carries, is determined by your hazard study, your LOPA and your safety requirements specification, and is owned by your process safety team and your functional safety engineer. Tagsight reproduces what your documents state and makes no representation that its output conforms to any standard.
Workflow.
- Upload your P&IDs and cause-effect matrices (PDF or image). Include safety-layer drawings if produced separately from the process P&IDs.
- Review the extracted SIS instrument rows. Verify SIL rating, voting logic, and BPCS/SIS assignment. Add or correct any misclassified tags.
- Export the SIS I/O list to Excel. Use the BPCS/SIS filter to produce a standalone SIS I/O list for IEC 61511 documentation.
Common questions
How does Tagsight identify SIS instruments on a P&ID?
Can Tagsight extract SIL ratings from the P&ID?
What voting logic notations are supported?
How is BPCS vs SIS separation captured?
Can Tagsight read cause-effect matrices?
What standards govern the extraction and review process?
Is the SIS I/O list kept physically separate from the BPCS list?
Run it on your drawings.
Upload your P&IDs and cause-effect matrices, get SIL ratings, voting logic, and BPCS vs SIS separation structured into an I/O list, export to Excel.
Three drawings included on a new account.