1. http://www.electropedia.org/
2. EN 954‐1:1996.Safety of machinery – safety‐related parts of control systems – general principles for design.
3. IEC 60204‐1:2016.Safety of machinery – electrical equipment of machines part 1: general requirements.
4. IEC 61508‐0:2010.Functional safety of electrical/electronic/programmable electronic safety‐related systems – Part 0: Functional safety and IEC 61508.
5. IEC 61508‐1:2010.Functional safety of electrical/electronic/programmable electronic safety‐related systems – Part 1: General requirements.