9/27/2018 3:26 PM | |
Joined: 1/3/2006 Last visit: 2/19/2024 Posts: 726 Rating:
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Hi Iam using LR560 Profibus PA model 7ML54401GA001BA2-Z
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Last edited by: Jen_Moderator at: 10/24/2018 3:15:23 PMOptimized link. |
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10/24/2018 12:03 PM | |
Joined: 12/13/2012 Last visit: 10/5/2023 Posts: 124 Rating:
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Hello , you have to use the tree topology for the installing. Yes, they will be powered from the bus signal. Please find further informations about the installing and the cable length in the attached guide. Hope this helps ! AttachmentProfibusPA_Installation_Guideline.pdf (478 Downloads) |
10/24/2018 4:15 PM | |
Joined: 9/27/2006 Last visit: 9/4/2024 Posts: 12282 Rating:
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Hello Manmeet; On Profibus-PA instruments there are only 2 connectors for the fieldbus, that is correct. Connectivity packages come in 2 different designs that I know of, using the same standard Profibus-PA cable. All intruments on Profibus-PA are powered by the PA couplers. Siemens proposes a "Split-Connect" system where the trunk cable (from the Profibus-PA master) allows for a spurline (stub line, drop-cable) to the instrument. If you read the specifications for Profibus-PA you will see that it specifies the maximum length of spurlines in a network, depending on the number of instruments connected. Page 3-8 f the manual proposed by Levelmans earlier shows the total length of the PA network and the length of allowed spurlines You will find information on the Split-connect system in chapter 6 of the Profibus networks manual: https://support.industry.siemens.com/cs/af/en/view/1971286 Weidmuller offers similar (in concept) T-Connectors for Profibus-PA, more robust that the Split-Connect system: https://files.clrwtr.com/userfiles/ct/documents/weidmuller/weidmuller-profibus-pa-distributor.pdf Another connection technique consists of using specially designed hubs, from MTL for example. We used the MTL Megablocks on many projects. They were designed originally for Foundation Fieldbus connectivity, but since Profibus-PA and FF follow the same physical standards they work well on PA instruments. http://www.vsp-co.org/assets/f300-megablocks-rev7.pdf The Megablock hubs connect 4, 8 or 12 instruments to a continuous trunk cable. Again the total length of spurlines must be taken into account when designing the network, and terminating resistors must be purchased (and installed on the last hub of the trunk) seperately. One added advantage of these hubs is that they offer surge protection on every PA line, and also come with Zone 2 Div 2 area protection. Hope this helps, Daniel Chartier AttachmentFiles.zip (448 Downloads) |
Last edited by: dchartier at: 10/24/2018 4:16:06 PMLast edited by: dchartier at: 10/24/2018 6:18:59 PMLast edited by: dchartier at: 10/24/2018 8:46:08 PMLast edited by: Jen_Moderator at: 10/25/2018 8:38:56 AMAdded all files as a ZIP-file. |
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