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Profinet with 8 x CPU 1215C

Created by: BLimaM4I at: 6/20/2012 6:20 PM (8 Replies)

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6/20/2012 6:20 PM	Rate (0)
BLimaM4I Bronze Member Joined: 6/12/2012 Last visit: 2/8/2024 Posts: 165 Rating: (7)	Hi! I have a project with 8 x S7-1200 PLC's. To avoid using a switch to make them communicate to each other, I can use the two ports of each PLC, of the 1215C CPU, and replicate the cable from one PLC to the other up to the last PLC? Or should I use a switch to make a star communication between them? Thanks, Bruno
	Thanks, Bruno
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6/20/2012 8:54 PM	Rate (1)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 3/20/2025 Posts: 15736 Rating: (2488)	BrunoFunchas Hi! I have a project with 8 x S7-1200 PLC's. To avoid using a switch to make them communicate to each other, I can use the two ports of each PLC, of the 1215C CPU, and replicate the cable from one PLC to the other up to the last PLC? Or should I use a switch to make a star communication between them? Thanks, Bruno If you want to have every plc route data manually, you can daisy chain them. This isa LOT of work. Me, I would get a 10 port switch, hook them all up to that switch, which gives you room to connect a computer and HMI or another switch. Now they can directly communicate to one another any time you like without anything in the middle.
	science guy
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6/20/2012 11:18 PM	Rate (0)
BLimaM4I Bronze Member Joined: 6/12/2012 Last visit: 2/8/2024 Posts: 165 Rating: (7)	huggy_d1 BrunoFunchas Hi! I have a project with 8 x S7-1200 PLC's. To avoid using a switch to make them communicate to each other, I can use the two ports of each PLC, of the 1215C CPU, and replicate the cable from one PLC to the other up to the last PLC? Or should I use a switch to make a star communication between them? Thanks, Bruno If you want to have every plc route data manually, you can daisy chain them. This isa LOT of work. Me, I would get a 10 port switch, hook them all up to that switch, which gives you room to connect a computer and HMI or another switch. Now they can directly communicate to one another any time you like without anything in the middle. Should I use a swicth from Siemens or a common switch will do the work? The PLC's will inform the operator but will not interfere with the production! Regards, Bruno Thanks, Bruno
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6/21/2012 2:55 PM	Rate (0)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 3/20/2025 Posts: 15736 Rating: (2488)	I have not had a switch yet not work with the S7-1200 PLC. That does not mean that all desktop switches will work. I would suggest a good industrial DIN-rail mountable 24V powered switch. I cannot recommend a brand as this is a Siemens web site, plus, they may not be readily available in your area.
	science guy
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6/21/2012 4:48 PM	Rate (0)
Felipe.Maia Posts: 33 Rating: (1)	Dear, When you using the two CPU ports and avoid switch you increase you network speed ??? When i lost one device i will lost all other devices or only that with problem ?? Thanks a lot..
Felipe.Maia Posts: 33 Rating: (1)
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6/22/2012 7:45 AM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 3/20/2025 Posts: 3042 Rating: (1061)	Dear all even though the available technical spec of the new S7-1215 CPU is not full clear on this, here's my take on things: The S7-1215 CPU has an inbuilt three port Ethernet switch which exposes two RJ45 ports to the outside world. One would hope that this inbuilt switch also supports the so called cut trough mechanism which greatly reduces the timeneeded for a frame to pass through the switch and makes the daisy chaining of serveral S7-1215 CPU's asuitable proposition. Assumingit does support cut through mechanism and you would "daisychain" all CPU's in a quasi line topology (aka linear Topology), you want to ensure that each CPU remains powers on you will otherwise loose the inbuilt switch and break the communciation "line". If you do not want to accpet this risk and/or be able to power off CPU's, you would go for the external switch solution as already mentioned by huggy_d1. Last but not least, the inbuilt switch of the new S7-1215 CPU may perhaps alreadysupport MRP (Media Redundancy Protocol) in which case you can built a ring Topology. Would be great is someone out there either knows or has atechnical spec of these new 1215 CPU's that clarifys if the inbuilt switch supports cut trough and MRP. I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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6/22/2012 11:40 AM	Rate (0)
BLimaM4I Bronze Member Joined: 6/12/2012 Last visit: 2/8/2024 Posts: 165 Rating: (7)	Hi! For my project, I think I can take the risk of breaking the chain since it is not a critical application. If my company approves the project I will post here the results by using the CPU1215C Thanks to you all, Bruno
	Thanks, Bruno
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6/22/2012 11:46 AM	Rate (0)
fbelic Posts: 327 Rating: (28)	Greetings I was also to suggest MRP, but that means that he won't be able to use any HMI device, since he has only 2 ports on each CPU. In this case he would be again forced to buy a switch, and one that supports MRP, or buying a PN card for PC with two ports - and both are not cheap. What you could do is to replace one of 1200 CPUs with ET200S 151-8 CPU, that has three integrated ports. So you can connect all CPUs in MRP ring, and have one extra port for HMI. Best regards
fbelic Posts: 327 Rating: (28)
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6/22/2012 4:07 PM	Rate (0)
Felipe.Maia Posts: 33 Rating: (1)	I using a IM 151-8 to improve a project, an for my surprise that had a good price if you compare with another IMs ...
Felipe.Maia Posts: 33 Rating: (1)
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