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PROFIBUS CALBE

Created by: Ashok Naphade at: 5/25/2014 8:37 PM (14 Replies)

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5/25/2014 8:37 PM	Rate (1)
Ashok Naphade Bronze Member Joined: 6/8/2013 Last visit: 12/26/2024 Posts: 158 Rating: (9)	HI, IT IS POSSIBLE TO USE PROFIBUS PA CALBE FOR PROFIBUS DP COMMUNICATION ?

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5/25/2014 8:54 PM	Rate (0)
SMHZ Bronze Member Joined: 10/19/2012 Last visit: 4/17/2022 Posts: 315 Rating: (9)	Although both are 2-wire cables i guess there will be some differences like EMC compatibility etc. .

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5/25/2014 9:03 PM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 12/13/2024 Posts: 728 Rating: (43)	Can I install PROFIBUS DP cable in a PA network? Lots of users have the impression this will never cause a problem because of the high speed signal characteristics of DP cable (even if the impedance is not correct), but there are other factors that could make it very unstable: • There will be too much voltage loss at the end of the cable because of the higher loop resistance of standard DP cable (110 Ohm/km). PA cable has a loop resistance of 44 Ohm/km. When it is an Ex coupler with only 12.xV output, there is a change the last devices "get lost" all the time". • The DP cable gets over-powered because of its "thin" 0.64 mm diameter wires. PA cable wires have a diameter between 0.8 to 1.5 mm. • PA Coupling components cannot handle the "thin" wires of the DP cable. • When it is an Ex installation, the DP cable is probably not blue and not suitable for the FISCO Ex specs. Our advice is to use only cable that complies with the PA specifications! Source:http://www.procentec.com/faq/profibus/

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5/25/2014 10:46 PM	Rate (0)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 1/2/2025 Posts: 4518 Rating: (841)	Ashok Naphade HI, IT IS POSSIBLE TO USE PROFIBUS PA CALBE FOR PROFIBUS DP COMMUNICATION ? SMHZ Although both are 2-wire cables i guess there will be some differences like EMC compatibility etc. . The issue is not number or wires, shielded or not. The issue is the cable specification for both applications. I have never tried coz I never thought in thins way, but both cables are different in thier specifications. And I am sure that Siemens and other manufactureres of Profibus DP and PA cables are not doing that just for fun. Profibus DP cable. Profibus PA cable. Hope this helps.
	Ayman Elotaify
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This contribution was helpful to 1 thankful Users Thangabali

5/26/2014 6:13 AM
SMHZ Bronze Member Joined: 10/19/2012 Last visit: 4/17/2022 Posts: 315 Rating: (9)	Ayman Elotaify Ashok Naphade HI, IT IS POSSIBLE TO USE PROFIBUS PA CALBE FOR PROFIBUS DP COMMUNICATION ? SMHZ Although both are 2-wire cables i guess there will be some differences like EMC compatibility etc. . The issue is not number or wires, shielded or not. The issue is the cable specification for both applications. I have never tried coz I never thought in thins way, but both cables are different in thier specifications. And I am sure that Siemens and other manufactureres of Profibus DP and PA cables are not doing that just for fun. Profibus DP cable. Profibus PA cable. Hope this helps. I agree that we must not use PA cable for DP & vice versa . . .

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5/26/2014 6:33 AM	Rate (0)
Ashok Naphade Bronze Member Joined: 6/8/2013 Last visit: 12/26/2024 Posts: 158 Rating: (9)	Dear, Practically i tested it up to 4m it work but if distance increase then is it work ?

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5/26/2014 7:33 AM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 12/13/2024 Posts: 5697 Rating: (715)	Hello, You can use any cable you like and it might work, but not without the risk of errors. There is a standard and not without reason. So let's not try to proof they are wrong. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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5/26/2014 7:46 AM
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 1/2/2025 Posts: 4518 Rating: (841)	Hello, Please read the following info: Frequently Asked Profibus Questions Can I install PROFIBUS DP cable in a PA network? Lots of users have the impression this will never cause a problem because of the high speed signal characteristics of DP cable (even if the impedance is not correct), but there are other factors that could make it very unstable: • There will be too much voltage loss at the end of the cable because of the higher loop resistance of standard DP cable (110 Ohm/km). PA cable has a loop resistance of 44 Ohm/km. When it is an Ex coupler with only 12.xV output, there is a change the last devices "get lost" all the time". • The DP cable gets over-powered because of its "thin" 0.64 mm diameter wires. PA cable wires have a diameter between 0.8 to 1.5 mm. • PA Coupling components cannot handle the "thin" wires of the DP cable. • When it is an Ex installation, the DP cable is probably not blue and not suitable for the FISCO Ex specs. Our advice is to use only cable that complies with the PA specifications! Hope this helps.
	Last edited by: Ayman Elotaify at: 5/26/2014 9:26 AM Ton Verra... Good morning. I just noticed now that the content of my post is exactly as yours. I can not delete my post now coz it is not the last one. In any case, for more info, readers can see the link provided in my post. Good bye Ayman Elotaify
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5/26/2014 7:47 AM	Rate (0)
SMHZ Bronze Member Joined: 10/19/2012 Last visit: 4/17/2022 Posts: 315 Rating: (9)	Ashok Naphade Dear, Practically i tested it up to 4m it work but if distance increase then is it work ? You could even use a simple 2-wire cable to lay Profibus Network on it but there are certain standards with one must comply to ensure safety & proper working of equipment.

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5/26/2014 7:56 AM	Rate (0)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 1/2/2025 Posts: 4518 Rating: (841)	SMHZ Ashok Naphade Dear, Practically i tested it up to 4m it work but if distance increase then is it work ? You could even use a simple 2-wire cable to lay Profibus Network on it but there are certain standards with one must comply to ensure safety & proper working of equipment. Hello, Normal Cables and Profibus PA are not released for using in Profibus DP networks. Normal Cables and Profibus DP are not released for using in Profibus PA networks. Each cable of the above have its own specification complied with IEC61158 for Profibus DP or IEC61158-2 for Profibus PA. Please download the attached manual. Hope this helps. Attachment InstallationGuideV9_2.pdf (288 Downloads)
	Ayman Elotaify
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This contribution was helpful to 1 thankful Users Thangabali

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