IEC 61508-2: 1999 Functional safety of electrical/electronic/programmable electronic safety-related systems. Part 2: Requirements for electrical/electronic/programmable electronic safety-related systems

The International Electrotechnical Commission (IEC). 69 p. This part of IEC 61508:
a) is intended to be used only after a thorough understanding of IEC 61508-1, which provides the
overall framework for the achievement of functional safety;
b) applies to any safety-related system, as defined by IEC 61508-1, which contains at least one electrical, electronic or programmable electronic based component;
c) applies to all subsystems and their components within an E/E/PE safety-related system (including
sensors, actuators and the operator interface);
d) specifies how to refine the information developed in accordance with IEC 61508-1, concerning the
overall safety requirements and their allocation to E/E/PE safety-related systems, and specifies how the overall safety requirements are refined into E/E/PES safety functions requirements and E/E/PES safety integrity requirements;
e) specifies requirements for activities that are to be applied during the design and manufacture of the
E/E/PE safety-related systems (i.e. establishes the E/E/PES safety lifecycle model), except for software, which is dealt with by IEC 61508-3 (see figures 2 and 3) – these requirements include the application of techniques and measures, which are graded against the safety integrity level, for the avoidance of, and control of, faults and failures;
f) specifies the information necessary for carrying out the installation, commissioning and final safety
validation of the E/E/PE safety-related systems;
g) does not apply to the operation and maintenance phase of the E/E/PE safety-related systems –
this is dealt with in IEC 61508-1 – however, IEC 61508-2 does provide requirements for the preparation of information and procedures needed by the user for the operation and maintenance of the E/E/PE safety-related systems;
h) specifies requirements to be met by the organisation carrying out any modification of the E/E/PE safety-related systems.