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104595 Datasheet(PDF) 36 Page - PHOENIX CONTACT |
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104595 Datasheet(HTML) 36 Page - PHOENIX CONTACT |
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36 / 41 page  Appendix - Safety-related applications (SIL 2) en Version 04 PHOENIX CONTACT A-2 Summary: Together with the actual signal transmission, continuous checks and diagnostic functions are performed in the mea- suring transducers in order to detect faulty behavior. The internal failure monitoring time (diagnostics test in- terval) is the time taken to carry out and repeat these tests in full. Random hardware faults are detected during this time. The internal failure monitoring time is 50 seconds. A1.2 Safety integrity requirements A1.2.1 Failure rates: MACX MCR(-EX)-T-UIREL-UP (-SP)(-C) – Type B device (according to EN 61508-2) – Safety Integrity Level (SIL) 2 –HFT = 0 – 1oo1d architecture The total failure rate is: 1.34 * 10 -6 The MTBF (Mean Time Between Failures) is therefore 85 years. The probability of a dangerous failure per hour for “continu- ous demand” mode and the average probability of failure of the specified function for “low demand” mode are deter- mined from the error rate: PFD avg values PFH* = 4.3 * 10 -8 /h The calculation is performed assuming a checking interval (T PROOF) of 1 year and a repair time (MTTR) of 24 hours, a test coverage (CPT) of 95% and a life time (LT) of 10 years. On the basis of the value determined for the average proba- bility of failure PFD avg, the checking interval can be in- creased to up to 5 years. The values are valid under the following conditions: – The failure rates of the components used remain con- stant throughout the period of use. – The propagation of failures by the device in the system is not taken into consideration. – The repair time (replacement) is 24 hours. – The failure rates of the external power supply unit are not taken into consideration. – The average temperature at which the device is to be used is 40°C. In this case, normal industrial conditions are assumed. – The specified failure rates are based on an average am- bient temperature of 40°C. For an average ambient temperature of 60°C, the failure rates must be multiplied by factor 2.5. Factor 2.5 is based on guide values. Safety/monitor- ing function Output sig- nal range Safe state Reason Safety function 4 ... 20 mA < 3.6 mA; or > 21 mA Relay is not con- trolled Deviation > 5% Input monitoring 4 ... 20 mA 2 - 3.6 mA; > 21 mA Line fault input Output monitoring 4 ... 20 mA = 0 mA Line fault out- put As a result of the multiple connection options, only two device types are considered in the con- figurations for “RTD 3-wire” or “mV” in the follow- ing. They represent all configurations with a variable resistance at the input terminals or volt- age or thermocouple inputs and always indicate the most conservative case. The two device types are: 1. MACX MCR(-EX)-T-UI-UP(-SP)(-C) 2. MACX MCR(-EX)-T-UIREL-UP(-SP)(-C) FIT (Failure In Time) 1 FIT is 1 failure in 10 9 hours Input: RTD 3-wire connection method Output: Switching output 2 and 3 (redundant) λ SD λ SU λ DD λ DU SFF DC D 0 2.34 * 10 -7 5.43* 10 -7 0.43 * 10 -7 94% 92 % 0 FIT 234 FIT 543 FIT 43 FIT T[PROOF] = 1 year 2 years 5 years PFD avg = 2.88 * 10 -4 4.67 * 10 -4 1.01 * 10 -3 |
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