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- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
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Hi,
I am new in PROFIBUS PA, and I know that it is possible to have up to 10 devices per segment in an EEx ia area. My question is, how many segments can I have in this EEx ia area? If I want to have 300 devices, and all of them in EEX ia area, that means that I can have 30 DP/PA couplers.
Another thing that is not clear is: when should I use barriers, and when segment protectors and so on? In general I understand the PA principle, but if somebody could give me real examples, I will appreciate it.
Thanks in advance.
Benjamin
I am new in PROFIBUS PA, and I know that it is possible to have up to 10 devices per segment in an EEx ia area. My question is, how many segments can I have in this EEx ia area? If I want to have 300 devices, and all of them in EEX ia area, that means that I can have 30 DP/PA couplers.
Another thing that is not clear is: when should I use barriers, and when segment protectors and so on? In general I understand the PA principle, but if somebody could give me real examples, I will appreciate it.
Thanks in advance.
Benjamin
I will recommend the following PROFIBUS in process brochure pages 12 and 18:
https://www.automation.siemens.com/infocenter/order_form.as px?Lang=en&tab=3&nodeKey=key_517576&docID=582
Call me if you need further assistance.
Regards
Moin
Cell: 215-9174989
https://www.automation.siemens.com/infocenter/order_form.as px?Lang=en&tab=3&nodeKey=key_517576&docID=582
Call me if you need further assistance.
Regards
Moin
Cell: 215-9174989
Thanks it was very helpful.
I also found this formula on the Siemens hompage:
https://support.automation.siemens.com/WW/llisapi.dll/2156 2130?func=ll&objId=29421329&objAction=csView&ClusterID=294209 74&nodeid0=23654018〈=en&siteid=cseus&aktprim=0& extranet=standard&viewreg=WW&load=treecontent&subtype=133000< br>
You can use the following formula for the theoretical maximum number of PA slaves per PROFIBUS master system (max. 125 DP slaves per master system):
* Ex version (hazardous area) of the DP/PA link (6ES7 157-0AD82-0XA0):
Number = 125 DP/PA links * 5 DP/PA couplers * 10 PA slaves (per DP/PA coupler) = 6250 PA slaves.
* Non-Ex version of the DP/PA link (6ES7 157-0AD82-0XA0):
Number = 125 DP/PA links * 64 PA slaves per IM157 = 8000 PA slaves.
Regards,
benjas
I also found this formula on the Siemens hompage:
https://support.automation.siemens.com/WW/llisapi.dll/2156 2130?func=ll&objId=29421329&objAction=csView&ClusterID=294209 74&nodeid0=23654018〈=en&siteid=cseus&aktprim=0& extranet=standard&viewreg=WW&load=treecontent&subtype=133000< br>
You can use the following formula for the theoretical maximum number of PA slaves per PROFIBUS master system (max. 125 DP slaves per master system):
* Ex version (hazardous area) of the DP/PA link (6ES7 157-0AD82-0XA0):
Number = 125 DP/PA links * 5 DP/PA couplers * 10 PA slaves (per DP/PA coupler) = 6250 PA slaves.
* Non-Ex version of the DP/PA link (6ES7 157-0AD82-0XA0):
Number = 125 DP/PA links * 64 PA slaves per IM157 = 8000 PA slaves.
Regards,
benjas
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