Fault Consideration & Fault Exclusion ISO 13849 – 1, Chapter 7 [1, 7] discusses the need for fault consideration and fault exclusion. Fault consideration is the process of examining the components and sub-systems used in the safety-related part of the control system (SRP/CS) and making a list of all the faults that could occur in each one. This a definitely non-trivial […]
Safety-Related Software Up to this point, I have been discussing the basic processes used for the design of safety-related parts of control systems. The underlying assumption is that these techniques apply to the design of hardware used for safety purposes. The remaining question focuses on the design and development of safety-related software that runs on that […]
Electrical Equipment of Machinery Most modern machinery is controlled electrically, or electronically. There are a number of standards that apply to the design of control systems for machinery, with IEC 60204 – 1 and it’s EN equivalent, along with IEC 61439 – 1 and IEC 61439 – 2 as the predominant standards internationally, and NFPA 79 as the predominant standard in the […]