The concept FMEA was based on IEC 61800-5-2: 2016 paragraph D.3 Fault Models shown in
the following list. The concept GMEA also considers 61508-2 table A1, discrete
hardware DC fault models for drift and oscillation.
- D.3.8 Resistors: The requirements of ISO 13849-2:2012, Table D.14
apply.
- D.3.11 Capacitors: The requirements of ISO 13849-2:2012, Table D.17
apply.
- D.3.12 Discrete semiconductors: For example diodes, Zener diodes,
transistors, triacs, GTO thyristors, IGBTs, voltage regulators, quartz crystal,
phototransistors, light-emitting diodes [LEDs]. The requirements of ISO
13849-2:2012, Table D.18 apply.
- D.3.13 Signal Isolation components: The requirements of IEC 61800-5-2
Table D.5 apply.
- D.3.14 Non-programmable integrated circuits (IC): The requirements of IEC
61800-5-2: 2016 Table D.6 applies. In this standard, ICs with less than 1
000 gates, less than 24 pins, or both, operational amplifiers, shift registers
and hybrid modules are considered to be non-complex. This definition is
arbitrary.
- D.3.15 Programmable ICs, complex ICs, or ICs that are both programmable and
complex: The requirements of Table D.7 apply. In this standard,
an IC is considered to be complex if it consists of more than 1 000 gates, more
than 24 pins, or both 1 000 gates and more than 24 pins. This definition is
arbitrary. The analysis should identify additional faults which should be
considered if they influence the operation of the safety sub-function.
This FMEA considers comparators, logic
gates, and load switches (less than 24-pins) type A per IEC 61800-5-2 D3.14, ISO1211
and ISO5852S (or ISO5452) are part of D3.13 and D.3.14.