Thread Starter: Safety-Man Started: 2/5/2010 1:56 PM Replies: 2
Hi,I was calculating the SIL according IEC 62061 standard for a system, composed by:2 x failsafe Position Switches 3SE51x PLC S7-315F2DP1x Fail-safe Module 4/8 F-DI - ET200S1x Sinamics G120 with CU240 DP-FUsing the safety Evaluation Tool I got a PFHD total of 7.59 E-08, however the Safety Evaluation tool give me a SIL 2, when according IEC 62061 SIL 3 is (>/=1.00E-08 to <1.00E-07). Someone told me that happens because of Sinamics G120 only has an approval for SIL2. Shouldn't the global value (which is inside SIL 3) prevail? Why don't happens?Which measure I should take to increase the SIL level for SIL3 - We need SIL 3!