Key Parameters

Key Parameters As previously seen, to design the SIS (“Safety Instrumented System”) according to IEC 61511, several requirements must be met throughout its life cycle. Compliance with the SIL level assigned to each SIF (“Safety Instrumented Function”) is one of these requirements, and is performed by calculating the Average Probability […]

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Architectures

Most used Architectures In the following table we show the most used architectures when designing Safety Instrumented Functions (SIF). LogicChannelsHFT (S)HFT (A)ObjetivesUsed for1oo1100 sensor, actuator1oo2210More Safetysensor, actuator2oo2201More Availabilitysensor, actuator2oo3311Safety+Availabilitysensor, PLC1oo2D210Safety with high diagnosticsPLC (DMR)2oo4D421/2Safety+Availab. with high diagnosticsPLC (QMR)2oo3D31/21/2Safety+Availab. with high diagnosticsPLC (TMR) HFT(S)= Hardware Fault Tolerant for Safety HFT(A)= Hardware Fault […]

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