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| 7/8/2009 3:51 PM | |
Joined: 10/7/2005 Last visit: 9/13/2024 Posts: 3020 Rating:
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Hello cheetous it has to with the fact that the safety related communication between the F-CPU and the F-I/O cards adds additonal checks into the message (e.g. Status/Control bytes, CRC's, message Sequence numbers)to achieve the required SIL3/CAT4 rating. For this "extra safety related data" every F-DI or F-AI card needs also "outputs" and every F-DQ card needs also inputs. You will also notice that the amount of input bytes for a safety Input card is greaterthanwhat is required for the pure amount of inputs (e.g. a 24 channel F-Di has 3 Bytes ofinputs, butoccupies 10 bytes in the configuration). No need to worry about this too much though, you'll only use the "real" inputs and/or outputs which alwasy are the first ones in the address range per card. I hope this answers you question. |
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| 7/9/2009 3:52 AM | |
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Joined: 10/7/2005 Last visit: 9/13/2024 Posts: 3020 Rating:
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Hello again Cheetous PI (Profibus & Profinet International) has quite a nice"Profisafe system decription" pdf which contains the more technical info on Profisafe that you are after. The pdf is a free downloadfrom their webpage (www.profibus.com) andthe direct link it isTHIS. I trust this helps |
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| 7/20/2009 7:55 AM | |
Joined: 7/8/2009 Last visit: 9/20/2022 Posts: 56 Rating:
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Thank You man for your Perfect and Helpfull Answer Thanks |
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