Iec 61508 pdf

While this is allowed in the standard, It may lead to greater complexity and increase the difficulty In carrying out E1EPE system safety lifecycle activities for example design. NOTE 1 Sufficient independence of implementation Is established by showing that Ihe probability of a dependent failure between the parts Implementing safety functions of different Integrity levels is sufficiently low in companson with the highest safety integrity level associated with the safety functions involved, NOTE 2 Where several safety functions are implemented in an EIEIPE safety-related system then ii will be necessary to consider the possibility that a single fault could cause a failure of several safety functions.

In such a situation, it may be appropriate to determine the requirements for hardware and software on the basis of a higher safety integrity level than is associated with any one of the safety functions, depending on the risk associated with such a failure. Related Information Download. Functional safety. Methods of test for petroleum and its products — BS Bestsellers Editors' Picks All audiobooks.

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