IEC 61508-3: 1997 Functional safety of electrical/electronic/programmable electronic safety-related systems Part 3: Software requirements

The International Electrotechnical Commission (IEC). Version 12.0 05/12/97. 45p. This part of this standard:
a) is intended to be utilised only after a thorough understanding of parts 1 and 2.
b) applies to any software forming part of a safety-related system or used to develop a safety-related system within the scope of parts 1 and
2. Such software is termed safety-related software.
c) requires that the software safety functions and software safety integrity levels are specified.
d) establishes requirements for safety lifecycle phases and activities that are to be applied during the design and development of the safety-related software (the software safety lifecycle model). These requirements include the application of measures and techniques, which are graded against the safety
integrity level, for the avoidance of and control of faults and failures in the software.
e) provides requirements for information relating to the software safety validation to be passed to the
organisation carrying out the E/E/PES integration.
f) provides requirements for the preparation of information and procedures concerning software needed
by the user for the operation and maintenance of the E/E/PE safety-related system.
g) provides requirements to be met by the organisation carrying out modifications to safety-related software.
h) provides, in conjunction with parts 1 and 2, requirements for support tools such as development and
design tools, language translators, testing and debugging tools, configuration management tools.