# IEC 61511-1:2016 Functional safety – Safety instrumented systems for the process industry sector – Part 1

Standards · `IEC 61511-1:2016` · verification: source checked

IEC 61511-1:2016 is an international standard that gives requirements for the specification, design, installation, operation and maintenance of a safety instrumented system (SIS) so that it can be entrusted to achieve or maintain a safe state of the process. It was developed as a process sector implementation of IEC 61508:2010. It is Part 1 of the IEC 61511 series and covers framework, definitions, system, hardware and application programming requirements.

## Specification

| Property | Value |
|---|---|
| Body | IEC |
| Reference | IEC 61511-1 |
| Edition year | 2016 |
| Status | published |

## Connected

- Related: [IEC 61508-1:2010](https://machineschema.com/standard/iec-61508.md)

## Safety

- Establishes performance targets based on safety integrity levels (SIL) to manage risk.
- Covers the SIS lifecycle from initial specification through decommissioning.

## Study notes

- Prepared by technical committee TC 65/SC 65A, System aspects.
- Publication date 2016-02-24; second edition (2.0), 175 pages.
- A consolidated version exists as IEC 61511-1:2016+AMD1:2017 CSV, edition 2.1, dated 2017-08-16.
- The corrigendum of September 2016 (COR1:2016) is included in this copy.
- ICS classifications: 13.110 and 25.040.01; stability date 2029; ISBN 9782832231593.
- Adopted in the US as ANSI/ISA-61511-1-2018/IEC 61511-1:2016+AMD1:2017 CSV.
- Part 2 of the series (IEC 61511-2:2016) gives guidelines for the application of Part 1; Part 3 covers determination of required safety integrity levels.

## Sources

1. [IEC 61511-1:2016](https://webstore.iec.ch/en/publication/24241) (accessed 2026-10-25)
2. [ISA-84 Series of Standards](https://www.isa.org/standards-and-publications/isa-standards/isa-84-standards) (accessed 2026-10-25)

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