ability of a safety instrumented system to perform the required safety instrumented functions as and
Note 1 to entry: This definition is equivalent to the dependability of the SIS (Safety Instrumented System) with
regard to the required safety instrumented function. Dependability, being often understood as an economical
rather a safety concept, has not been used to avoid confusion.
Note 2 to entry: The term “integrity” is used to point out that a SIS aims to protect the integrity of the operators
as well as of the process and its related equipment from hazardous events.
Source: ISO/TR 12489:2013(E), Global Standards
The attribute of an information system when it performs its intended function in an unimpaired manner, free from deliberate or inadvertent unauthorized manipulation of the system.
From: CNSSI 4009.
Source: NICCS™ Portal Cybersecurity Lexicon, National Initiative for Cybersecurity Careers and Studies (https://niccs.us-cert.gov/glossary) as of 11 November 2015, Global Standards