METHOD OF PRESERVING THE SAFE STATE OF A REDUNDANT PROCESSOR AFTER OCCURENCE OF A FAILURE

摘要

The invention concerns the method of retention a safe state after a failure of electronic safety- relevant equipment and systems, in which processor technology with the use of principles of composite fail-safety is used in order to ensure a safety- relevant activity. This safe state is preserved after a failure so that the safety-relevant information that is necessary for performing the safety-relevant activity of the redundant processor part of the electronic safety-relevant equipment is transferred from the non-volatile memory to the volatile operating memory of the redundant processor part of the electronic safety- relevant equipment after initiating the activity and corrupted from the given non- volatile memory. When the redundant processor part of the electronic safety-relevant equipment transits to a safe state after a failure the appropriate safety-relevant information stored in the volatile operating memory is encrypted, which ensures that it is no longer possible to restore this safety-relevant information, thus continuing in the safety-relevant activity, even in the event that the redundant processor part of the electronic safety-relevant equipment is re-initialised.