9/28/2021 3:44 PM | |
Joined: 9/27/2006 Last visit: 10/10/2024 Posts: 12285 Rating: (2685)
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Hello Rodrigo; In my experience, Sieens (and most other PLC manufacturers) do not provide lifetime limits for their equipment. When you listen to the rumors on the web, you will hear horror stories of multiple sequences of CPU failures in some cases, others will tell you that their processes are still properly controlled by CPUs over 20 years old. But nothing from the manufacturers along those lines. The only (statistical) information you will find from any automation manufacturer on their products' (satatistical) lifespan would be the MTTF (Mean Time to Failure) value for each individual equipment. Siemens does not provide general tables for the MTTF, but allows you to ask for it in a Support Request, if you provide them with part number and serial number of the equioment. - General: Special tool with which the user can evaluate by itself the MTTF values (Mean time to failure)? https://support.industry.siemens.com/cs/ww/en/view/61454653 Hope this helps, Daniel Chartier |
9/28/2021 5:32 PM | |
Joined: 9/27/2006 Last visit: 10/10/2024 Posts: 12285 Rating: (2685)
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Hello Rodrigo; I agree, Siemens provides tables for MTBF of most of their automation equipment. Very useful information to validate the reliability of your type of CPU,but not if you want to know how long your particular PLC is estimated to last.. It may be confusing, but I am talking about the MTTF data for your PLCs, which you must request from Siemens Support. See this Safety FAQ for the difference between the 2 measuements: https://www.kollmorgen.com/en-us/developer-network/what-difference-between-mtbf-and-mttf-0/ Hope this helps, |
Last edited by: dchartier at: 09/28/2021 17:37:50 |
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