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FSM TA HOME PAGE > ADDRESSING YOUR CHALLENGES > ARE YOU CONFIDENT THAT SIL VERIFICATION FOR YOUR SIS COMPLIES WITH IEC 61511 REQUIREMENTS?

 

 

Addressing your challenges

 

 
 

Are you confident that SIL verification for your SIS complies with IEC61511 requirements?

 

What do we mean by SIL verification?

Commonly, the ‘SIL Verification’ term is used for describing the reliability calculation of the Safety Instrumented System (SIS) hardware random failure measure. This means either calculating the average probability of dangerous failure on demand (PFD), or the average frequency of dangerous failures (PFH), which is then compared against the target value as derived from the Hazard and Risk Assessment.

For overall compliance to the safety standards, the SIL Verification process also includes two further requirements:

1. Evaluation of the Safety Instrumented Function (SIF) safety devices Hardware Fault Tolerance (HFT) requirements for a given SIL.

2. Assessment of the SIS capability of the safety devices within the SIF to withstand systematic faults (SC) made during the manufacturing design and engineering process.

The SIL verification process should also include an assessment for whether the SIS devices have been properly selected. Devices shall either be manufactured to comply with IEC 61508 requirements or provide substantiated evidence of successful device performance (in safety and non-safety applications) in the targeted operating environment (prior-use evidence).

 

1. What mistakes are commonly made when it comes to SIL verification of an SIS? 

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2. How can ABB FSM TA help?

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