How many levels of control requires a critical safety system?
A safety-critical system need the following controls? "My experience with contaminants and electronic systems has led me to the conclusion that 4 levels of security are required to stop the effects adverse way out to the outside world. 4 is the minimum control stations or decontamination necessary safety assessments. 11 is unrealistic, but the test stupid. "
It is safe, 11 no doubt would be fool proof. In the real world, however, at least in their vehicle, is often only three. The airbag system in your vehicle is an example of a series of run crash sensors that require the activation of a sensor for self plus at least one accident sensor for the airbags deploy. This system is also turned off if the difference is in the components or wiring on the key in the computerized test of self. The system Antilock braking also has three – a test of self so that the system is activated, plus a redundant equipment in case of failure of the first and a warning lamp should any malfunction occur – which incorporates the braking system back to "normal" operation (ie without anti-lock function). Although the available technology is certainly, I doubt there could see the email address or throttle control (no mechanical linkage), by example, because any failure would most certainly result in injury or death – and control levels required would make the system cost prohibited.
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