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1756-RM001B-EN-P, Using ControlLogix in SIL2 ... - Tuv-fs.com

1756-RM001B-EN-P, Using ControlLogix in SIL2 ... - Tuv-fs.com

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E-4 Sample Probability of Failure on Demand (PFD) CalculationsTable E.4 shows an example of a PFD calculation for a safety loop<strong>in</strong>volv<strong>in</strong>g two DC <strong>in</strong>put modules used <strong>in</strong> a 1oo2 configuration and aDC output module us<strong>in</strong>g a proof test <strong>in</strong>terval of 4 years.Table E.4Catalog Number: Description: MTBF: Calculated PFD:<strong>1756</strong>-Axx <strong>ControlLogix</strong> Chassis 40,143,900 2.19E-05(average)<strong>1756</strong>-L55M16 <strong>ControlLogix</strong> 5555 2,855,348 3.09E-04Controller<strong>1756</strong>-OB16D DC Output 4,520,534 1.95E-04<strong>1756</strong>-IB16D DC Diagnostic Input 7,386,774 9.79E-06Total PFD calculation for a safety loop consist<strong>in</strong>g of these products: 5.36E-04Publication <strong>1756</strong>-<strong>RM001B</strong>-<strong>EN</strong>-P - October 2003

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