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cable spesification from CPU 317 2PN/DP to DP Slave (ET200)

11/27/2009 3:18 AM	Rate (0)
usen Posts: 17 Rating: (1)	Dear All, My CPU 317 PN/DP going error with SF & BF led Light because can`t detect their DP Slave (ET200). I connect the CPU and ET200 with general 0.75mm 2 cores control cable. This configuration was running well for 6 monthsuntil this day the error occur. The problem solve when i replace the cable with profibus cable. is any technical requirement for the cable? if yes, why our previous configuration 9with 0.75mm control cable) work well for 6 months? Thank for your help. salam
usen Posts: 17 Rating: (1)
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11/27/2009 4:41 AM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 3/18/2025 Posts: 12344 Rating: (2707)	Hello usen; Yes, there are some norms for Profibus-DP cabling, covered in the EN 50170 standard. The physical layer can be either RS-485 (which concerns your case with copper wire) or Fiber-optic cabling. Profibus cable is very stricty defined; Profibus connectors are also part of the recommendations of the standard. You can have a look at profibus.com/Technology to have some of your questions answered by the accreditation body for Profibus networks. The following attachment will show you some of the specifications of a certified Profibus-DP cabling, manufactured by Belden. Now, proper cabling is highly recommended, especially in industrial projects.Unshielded, 2-core analog cablemight work, under certain circumstances, which seems to have happened to you; it will depend on the stray capacitances on the cable, the bus length, the bus speed, and the number of nodes on the bus. At 9,6 kB, any RS-485 network is most forgiving.. We use unshielded twisted-pair cable occasionnaly, for lab testing purposes mostly. But when you start having trouble with the network, then troubleshooting can be very difficult, and you might get very little help from your Profibus component providers. Hope this helps, Daniel Chartier, Attachment Belden_cable_DP.jpg (202 Downloads)
	Last edited by: dchartier at: 11/27/2009 3:06 PM
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11/28/2009 1:58 AM	Rate (0)
usen Posts: 17 Rating: (1)	thank you dchartier,
usen Posts: 17 Rating: (1)
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11/28/2009 2:10 AM	Rate (0)
usen Posts: 17 Rating: (1)	dear Dchartier, is anyimpedancy change (impedancy decrease or increase?) caused by age of themulticore cable (cooper wire)? Thank
usen Posts: 17 Rating: (1)
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11/28/2009 11:29 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	usen dear Dchartier, is anyimpedancy change (impedancy decrease or increase?) caused by age of themulticore cable (cooper wire)? Thank No! But if some connections become loose, there may be a problem after some time.
IBN-Service Posts: 8946 Rating: (1000)
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