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Differences between bus cables?

Created by: Ayman Elotaify at: 9/13/2008 12:00 PM (6 Replies)

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9/13/2008 12:00 PM	Rate (0)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 12/5/2023 Posts: 4486 Rating: (834)	I was reading in the catalogue and I have seen many types of bus cables. Focusing on the two types: FC standard and FC food types of profibus cables; I do not understand what is the differences between the two types and I see that there is no techinical differences between them except for the insulation type and the colur. Why the second one is approved for food and bev. and tobacco industry and the first one is not? Regards,
	Ayman Elotaify
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9/13/2008 3:38 PM	Rate (0)
legacy support Silver Member Joined: 7/15/2008 Last visit: 7/13/2023 Posts: 382 Rating: (44)	Hello You are correct , all Cabels will work for Profibus communication . The diverence comes in playon where and for whatyou are using the Cabel . Depending on your Installation Requremets( Cable Tray , Food , Ship.... ) and Electrical Code requrements youcanselect the appropiate Cable.

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9/13/2008 4:08 PM	Rate (0)
UMENCHO Diamond Expert Joined: 3/21/2006 Last visit: 12/4/2023 Posts: 10222 Rating: (1178)	Ayman Elotaify I was reading in the catalogue and I have seen many types of bus cables. Focusing on the two types: FC standard and FC food types of profibus cables; I do not understand what is the differences between the two types and I see that there is no techinical differences between them except for the insulation type and the colur. Why the second one is approved for food and bev. and tobacco industry and the first one is not? Regards, Hi Just to add to previous answer: If you purchase profibus cable for food industry, this mean - cable was made from material that can use in food industry. I guest that this is correspond to some international standart. Together with this cable you will receive its specification. For example, I worked with some type of grease, that can use in food industry. This grease looks like normal yellow grease, but if you want to cover standart must work with this type of material. If you discuss this like a friend we can said: everythink is for money and politics.. regards

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9/13/2008 11:41 PM	Rate (0)
J_Bell Posts: 5822 Rating: (411)	Hello UMENCHO, well, I can not fully agree with you about the money and politics there. The issue can be that the standard cable may, if it gets in contact with the Food or is near the food may emit some elements of the isolation to the food that poisons the food and this may not be. So if you wouldlike to get some of it in your next lunch... just go ahead... I do not think ti is delicious. Best regards J_Bell
J_Bell Posts: 5822 Rating: (411)
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9/14/2008 10:32 AM	Rate (0)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 12/5/2023 Posts: 4486 Rating: (834)	Hi J_Bell, Then we can conclude that the main issue is the material of the cabel jacket. In case of the cable may touch the food we should use the Food cabel, otherwise, we can use the general purpose standard cabel. Am I understand well? Thanks again J_Bell.
	Ayman Elotaify
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9/14/2008 1:40 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 12/7/2023 Posts: 12188 Rating: (2637)	hello Ayman; This is simplifying things a little bit. In the Simatic Net Profibus networks manual (profn2_e.pdf), in the Passive Components for RS-485 networks chapter, you will find tables showing the different Profibus cables offered by Siemens and their main differences. I have taken the liberty of reducing the table to the simplest distnctions between cables: · FC Standard Cable · FC FRNC Cable: halogen-free FRNC sheath material · FC Food Cable: Sheath material PE 8.0 +/- 0.4 mm; UV resistance; flammable · FC Robust Cable: flame-retardant according to VDE 0472 T804 test type B; good resistance to mineral oil and greases; UV resistance; UL listed · FC Underground Cable: Sheath material PE/PVC 10.8 +/- 0.5 mm · FC Trailing Cable: Repeated bending radius ≥ 60 mm. Cable suitable for applications involving torsion: min. 5 million torsion movements on 1 m cable length (+/-180o) · Festoon Cable: Unrestricted segment lengths; Cables capable of trailing for the following requirements:- min. 4 million bending cycles at the specified bending radius (≥ 70 mm ) and max. acceleration of 4 m/s2 · Flexible Cable: repeated bending radius ≥ 120 mm. Cable suitable for applications involving torsion: min. 5 million torsion movements on 1 m cable length (+/-180o) · FC Process Cable for IEC 61158-2 (Profibus-PA): d.c. loop resistance ≤ 44 Ω /km; Transmission rate 31.25 Kbps, cable corresponds to FISCO model · SIENOPYR FR Marine Cable: very good resistance to mineral oil and greases; Operating temperature -40°C + 80 °C If you go to Profibus.com and Search the Product section for CABLE, you will return more than 300 hits from different manufactures (Phoenix Contacts, moeller, Profichip, Belden...) that can be used in specific environments. I have had to work in applications that required trailing cable, we needed it on a drum roll that would unwind as the platform it was connected to moved away, and rewound as it came back. Standard Profibus cable would never have survived the repeated twisting and bending on the winder; we found out by experience, the maintenance crew had used some on one of the units during a shutdown test; the cable cores broke after a couple of hours. Replacing the cable with braided, more flexible wires (Trailing cable) fixed the issue and ensured that all other specifications for Profibus cable were maintained. So standard cable will always be the "normal" cable used in Profibus networks and the first choice. But for any specific environmental or process applications, there are always alternatives you can apply. Hope this helps, Daniel Chartier
	Last edited by: dchartier at: 9/14/2008 1:41 PM
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9/15/2008 10:33 AM	Rate (0)
Ayman Elotaify Platinum Member Joined: 5/28/2008 Last visit: 12/5/2023 Posts: 4486 Rating: (834)	Thanks dchartier.
	Ayman Elotaify
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