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Abstract
Safety instrumented systems (SISs) component failure rate is extremely important for discussions on SIS components. In modern SIS, safety instrument function (SIF) components are connected by safe fieldbus, so detailed discussions on the requirements of safe fieldbus have been covered. The discussions also encompass details about EDDL, FDT, and various requirements of FF, PI OPC and HART so that FDI is possible. Alarms in SIS are important because it forms an IPL, therefore detailed discussions on alarm life cycle and alarm realization along with alarm management has been covered. Various technical aspects of sensors are also important part of SIF. Safe PLC is a requirement of SIS, so now the same can be realized has been covered. Also discussions on pros and cons of integration of BPCS and SIS via safe PLC have been covered. Final element which is the most vulnerable in SIS have been discussed at length with special reference to partial stroke testing full stroke testing and smart digital positioner. The chapter will be helpful in understanding the entire SIF loop thoroughly.
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