5/12/2014 7:45 AM | |
Joined: 12/4/2012 Last visit: 4/30/2024 Posts: 5 Rating: (0) |
R J, thanks for the info. svn_1 |
5/12/2014 9:04 AM | |
Joined: 5/28/2008 Last visit: 9/21/2024 Posts: 4515 Rating: (839) |
Hello, There's no special racks or power supplies for use with fail safe systems. According to IEC 61508, safety functionality should cover the safety loop from sensor to the actuator including, digital input or analog input, logic processing and digital output. To reilaize the standard IEC 61508 for certain loop, digital / analog module should be fail safe, the blocks used for programming should be certified, and if you used certified blocks the CPU is Fail safe and you can put TUV stickers on it, digital output module should be fail safe. Please doenload theexamination reportand see chapter 2.2
Hope this helps.
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Ayman Elotaify |
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This contribution was helpful to1 thankful Users |
5/12/2014 10:21 AM | |
Joined: 9/7/2007 Last visit: 8/30/2023 Posts: 550 Rating: (61) |
Any power supply will do the job, but take into consideration to use a trusted power supply which is not affected to small power variance at supply voltage or field short circuit. You may refer to thetechnical data as a reference.
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Best Regards |
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5/13/2014 9:38 AM | |
Joined: 5/28/2008 Last visit: 9/21/2024 Posts: 4515 Rating: (839) |
Hello svn_1, You are right. But if you paied a lot of money to purshase a fail safe system (CPU and IOs, software packages), you should select a trused power supply which should meet these requirements. What you have to check is the field power supply if it is not in your scope of supply. In any case, please look on the attachment, it is written clearly "The fail-safe signal modules and all their standard components can be operated in standard and safety mode on a single or on several shared power supply modules" For some cases -"if you would like to increase SIL to SIL3"-, a safety protector should be added in a slot before fail safe modules.The safety protector is used to protect the F-SMs from any overvoltage developing in thecase of a fault/error. Hope this helps.
Attachment19026151_s7300_failsafe_signal_modules_manual_en-US_en-US.pdf (271 Downloads) |
Last edited by: Ayman Elotaify at: 5/13/2014 9:40 AMLast edited by: Ayman Elotaify at: 5/13/2014 9:39 AMLast edited by: Ayman Elotaify at: 5/13/2014 9:39 AMAyman Elotaify |
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5/20/2014 8:26 AM | |
Joined: 10/20/2009 Last visit: 4/3/2017 Posts: 215 Rating: (12) |
Hi all, Just for information. GO through below link http://en.wikipedia.org/wiki/Extra-low_voltage Here they have explained about the concept of PELV & SELV |
Regards, |
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5/29/2014 8:01 AM | |
Posts: 63 Rating: (4) |
SITOP modular redundancy module for decoupling of 2 sitop power supplies: 6EP1961-3BA21 |
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