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6/16/2014 4:12 PM | |
Joined: 10/26/2009 Last visit: 5/28/2024 Posts: 63 Rating: (11) |
Hi Jota.Catrileo, thank you for your answer. I'm agree with you, I've seen the electric diagrams from Siemens manuals... You say "[...] since they are electrically isolated from the backplane bus", but how much is this isolation safe? In other words, how can I calculate the Performance Level (according to UNI EN ISO 13849-1) - or SIL - of a safety function realized by de-energizing the "L+" terminal of a DO module (through adeguate external safety circuit)? I' ve tried to perform the PL calculation with the online Siemens Safety Evaluation Tool, but I'm not been able to insert the S7-300 DO module in the safety-relevant components list... I'm looking for a "official Siemens documentation" who explain how to calculate the PL in such circuit... |
Last edited by: mircoaie3 at: 6/16/2014 4:14 PM |
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