5/6/2008 11:10 AM | |
Joined: 9/27/2006 Last visit: 8/23/2024 Posts: 12279 Rating:
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Hello gcavallotti; First point, the CPU 315-2DP cannot be used in any certified safety application. Second point, Siemens offers alternatives that do offer safety certification, with redundancy (F/H systems) or stand-alone (F-CPUs + F-I/Owith Distributed Safety package). See the following: 2.3 Fail-Safe Systems in SIMATIC S7 Which Fail-Safe Systems Are Available in SIMATIC S7? Two fail-safe systems are available for integrating safety engineering into SIMATIC S7 automation systems: 1. The S7 Distributed Safety system is used to implement safety concepts for protection of machines and personnel (for example, emergency OFF devices for operation of machine tool and production equipment) and in the process control industry (for example, for the execution of protection functions for measurement and control protection equipment and burners). 2. The fail-safe and, in particular, fault-tolerant S7 F/FH systems are available for automation of plants in the process control industry and in the oil industry. Fail-Safe, Fault-Tolerant S7 FH Systems To increase availability of an automation system and thus to prevent process failures due to errors in the F-system, S7 F-Systems can be optionally equipped with a redundancy feature (S7 FH Systems). Increased availability is achieved through component redundancy (power supply, central processing unit, communication and I/O). Achievable Safety Requirements S7 Distributed Safety and S7 F/FH systems can satisfy the following safety requirements: • Requirement class AK1 to AK6 in accordance with DIN V 19250/DIN V VDE 0801 • Safety class (Safety Integrity Level) SIL1 to SIL3 in accordance with IEC 61508 • Category 2 to Category 4 in accordance with EN 954-1 In the attached file you will have a list of available CPUs for either F or F/H applications. If you would like to readmore on the subject, download the files Safety Engineering in Simatic S7and Distributed safety: Configuring and programming Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 10/26/2010 6:33 PMa bit late, perhaps... Last edited by: dchartier at: 5/6/2008 11:14 AM |
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5/29/2008 3:44 PM | |
Joined: 9/27/2006 Last visit: 8/23/2024 Posts: 12279 Rating:
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Hello gcavallotti; I had seen a SIL-assistant software on the net a while back, it is used to calculate the SIL level of a safety loop. Have a look at their manual, it gives a presentation of the calculations and the evaluationsinvolved n such a procedure. Maybe it will help ou in your research. http://www.tmartin.de/SIL-Assistant%20Manual.pdf Hope this helps, Daniel Chartier |
5/30/2008 6:34 AM | |
Posts: 5 Rating:
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Hello Daniel, thank you for the information. I´ll study it. Their approach is quite clear, and surely it will help to semplify the item. Regards, Gabriele Cavallotti |
5/30/2008 10:29 AM | |
Posts: 5 Rating:
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Hello Daniel, Interesting stuff. I spent a while looking for software on net. It seems it´s not available. Do you know anything? Thank you. Regards, Gabriele |
5/30/2008 1:20 PM | |||
Posts: 124 Rating:
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Hello again Please read
You can search news about Bhopal in India, and other catastrophic accidents that could be avoid with the right Risk analysis.
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