SIS documentation, from your P&IDs.

Extract the SIS instrument subset from P&IDs and cause-effect matrices. SIL ratings, voting logic, ESD trip points, and BPCS vs SIS separation structured into an I/O list formatted for IEC 61511 and ANSI/ISA-84 audit work.

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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 Rating	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	SIL 1	1oo2	XV-202 (blowdown valve)	HH trip on pressure	LOPA Node 7
TSH-301	SIL 1	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	SIL 1	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 SIS extraction and classification workflow references IEC 61511-1:2016 for SIS lifecycle documentation requirements and instrument-tag classification conventions. IEC 61508-2 governs the hardware fault tolerance and SIL assignment vocabulary used in the review columns. ANSI/ISA-84.00.01-2004 (the US equivalent of IEC 61511) uses identical instrument-classification terms and the same SIL tier definitions. For shutdown valve tagging, ISA 5.1 first-letter conventions (Z for position/final element, S for safety) and IEC 81346-2 classification for safety functions both apply. IEC 61511-1 Part 3 guidance on P&ID representation of SIS boundaries informs the BPCS vs SIS separation detection logic.

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?

SIS instruments are identified by a combination of drawing annotation (SIL rating bubbles, safety-layer hatching, shutdown-tag prefixes such as ZSH, ZSL, PSH, PSL) and position relative to the SIS boundary. The review step lets the safety engineer verify every classification before export.

Can Tagsight extract SIL ratings from the P&ID?

SIL designations annotated on the drawing (e.g. SIL 1, SIL 2, SIL 3 in a bubble or table) are extracted and attached to the corresponding instrument row. SIL ratings not annotated on the drawing require a separate safety requirements specification; Tagsight does not infer SIL from process conditions.

What voting logic notations are supported?

1oo1, 1oo2, 2oo2, 2oo3, and 2oo4 voting notations in standard ISA 5.1 format are parsed from the drawing. KKS and IEC 81346 notation variants for voting architecture are also resolved. Non-standard notations are preserved as-is in the voting_logic column.

How is BPCS vs SIS separation captured?

Instruments whose drawing symbol includes the SIS-loop indicator (dashed boundary, double-line circle, or explicit SIS label) are classified as SIS in the signal_class_domain column. BPCS instruments use the standard AI/AO/DI/DO classification. The review step shows both layers simultaneously so you can verify separation.

Can Tagsight read cause-effect matrices?

Yes. Cause-effect matrix drawings are a supported document type. The extracted output maps each initiator (cause) row and each final element (effect) column to the corresponding instrument tag, producing a structured trip-logic table you can cross-reference against the P&ID extraction.

What standards govern the extraction and review process?

The functional safety extraction workflow references IEC 61511-1:2016 (safety instrumented systems for the process industry) and IEC 61508 (functional safety of electrical/electronic/programmable systems) for tag classification and SIL assignment conventions. ANSI/ISA-84.00.01 (equivalent to IEC 61511) is the US counterpart and uses identical instrument-classification vocabulary. The exported I/O list columns map to the terminology in those standards.

Is the SIS I/O list kept physically separate from the BPCS list?

By default the exported Excel workbook has a single I/O list sheet with a BPCS/SIS column. If your project requires physical segregation, the review step supports filtering by SIS flag and exporting the filtered set as a standalone workbook.

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.

Upload a drawing Pricing

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