ABB FSO-21, User Manual

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Verification and validation 457
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Verification and validation
Contents of this chapter
This chapter describes verification and validation of the implemented safety
functionality.
Verification and validation produce documented proof of the compliance of the
implementation with specified safety requirements.
Further information can be found in Technical guide No. 10 - Functional safety
(3AUA0000048753 [English]).
Verifying the achieved SIL/PL level
Verification of the functional safety system demonstrates and ensures that the
implemented safety system meets the requirements specified for the system in the
safety requirements specification phase.
The most convenient way to verify the required SIL/PL level reached with the
implemented system is to use a specific safety calculator software.
Purpose of the validation testing
The purpose of the validation testing is to verify that the safety functions which are
used in the safety system, operate as required in the application, and that the safety
requirements specification (SRS) arising from the risk assessment is fulfilled. By
testing, the plausibility of the safety functions is ensured against the SRS
requirements. All situations relevant to the application according to the risk
assessment must be tested. For example, possible configuration errors of the safety
functions should be found by the validation testing.