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Wireless Solution

Created by: B1Zk1T at: 6/2/2009 1:12 PM (8 Replies)

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6/2/2009 1:12 PM	Rate (0)
B1Zk1T Posts: 7 Rating: (0)	Hi, I need someone with more experience than me to tell what material I need to do: - Comunication wireless with 4 digital inputs; I have a CPU 315C-2DP in one of the side. I need to communicate with a installation at 10m but in the midlle is an road. What I need to the both sides?? What solutions have Siemens to do this work? Thanks, PS
B1Zk1T Posts: 7 Rating: (0)
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6/2/2009 1:31 PM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 12/10/2024 Posts: 2957 Rating: (243)	Hi, 10m is not very long distance even if its between road. You need outdoor WiFi antennas routers (may be Siemens, may be others) and connect them to ethernet CP modules. If road is still problem then rise antennas 3 meters on both sides and problems will be gone. I can say from my experience that 10m is so small distance for WiFi that you surely will have no problems at all.
	Best regards, Darius
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6/2/2009 2:24 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 1/21/2025 Posts: 12330 Rating: (2702)	Hello B1Z; Had you asked 2 years ago, I would have suggested the Profibus ILM (Infrared Link Module), we used it for such an application in one project, and the specs of the unit would have been right for you too. Unfortunately, it seems the product has been discontinued in 2008, maybe not enough buyers. Siemens offers only Profinet wireless support, either to a Profinetor Profibus-DP slave. Have a look at the following FAQ: "Linking Profinet nodes with Wireless Lan" http://support.automation.siemens.com/WW/view/en/19550110 A Profinet Lan can be connected to a Profibus slave: Wireless integration of PROFIBUS lines An existing Ethernet network can be expanded by a mobile network without increased overheads. An existing PROFIBUS network can, for example, be connected using an access point and the IWLAN/PB Link PN IO (see schematic below). The wireless connection is established to the mobile stations by connecting a SCALANCE W access point to the Ethernet network. The mobile stations are connected over wireless with a client module, for example the SCALANCE W746-1PRO client module to which the mobile station is connected by a cable. But that would require a PN CPU... You could also look at Prosoft Technology's Wireleless Profibus Master and Slave combinations. http://www.prosoft-technology.com/prosoft/products/stand_alone_gateways/wireless/wireless_profibus_dp_communication_gateways A typical topology is shopwn in the attached picture. Hope this helps, Daniel Chartier Attachment Wireless_Profibus.jpg (259 Downloads)
	Last edited by: dchartier at: 6/2/2009 2:30 PM
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6/2/2009 2:37 PM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 12/10/2024 Posts: 2957 Rating: (243)	Hi, Somehow I thought that we speak about ethernet, sorry . Anyway it will be easier to solve your task by using Ethernet/PN CPs.
	Best regards, Darius
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6/2/2009 2:55 PM	Rate (1)
Anchobi Posts: 139 Rating: (25)	DataEagle also have a series of wireless profibus modems as well. they ofer them in more than just the 802.11 modulationprotocols aswell so you can be sure of data security if the link is in a public place. start here http://www.schildknecht.info/
Anchobi Posts: 139 Rating: (25)
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6/2/2009 3:42 PM	Rate (1)
Darius Platinum Member Joined: 9/28/2005 Last visit: 12/10/2024 Posts: 2957 Rating: (243)	I would not recommend using wireless profibus. Like dchartier said its not manufactured by Siemens anymore and I think its is not based only on sales. I had good oportunity in my life to be a guest at company which develops GSM sollutions including industrial modems and so on. I asked why you not implementing profibus in GSM networks. I thought it would be nice, but they said that profibus is complicated protocol and hard to implement in such a sollutions because of short ack times of protocol. So maybe wireless solutions was also a problem ? Maybe it was problems with stability ? I think its not good to have 100 times a day BF LED on. Has anyone here successfuly used profibus wireless solutions ? It would be nice to share your experience.
	Best regards, Darius
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6/2/2009 4:18 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 1/21/2025 Posts: 12330 Rating: (2702)	Hello Darius, guys; We did a project on Profibus-DP wireless telemetry, using Satel radio-modemsin a topology similar to the one shown here: http://www.satel-west.com/support/applications/profibus.htm The onl7y reason i did not suggest this earlier is cost and speed (these modems were limited to 9600 baud over Profibus at the time, don't know if they have different baud rates available now). The low speed enabled them to bypass the ack-timing that Darius mentionned. The system was quite stable, with acceptable performance for our needs. But as I said, could be overkill forthis application. Hope this helps, Daniel Chartier
	Last edited by: dchartier at: 6/2/2009 4:19 PM
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This contribution was helpful to 1 thankful Users Darius

6/2/2009 7:25 PM	Rate (0)
Darius Platinum Member Joined: 9/28/2005 Last visit: 12/10/2024 Posts: 2957 Rating: (243)	Hi, Thanks for sharing your experience, Daniel. Its very interesting and helpful for the future.
	Best regards, Darius
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6/3/2009 12:38 AM	Rate (1)
Anchobi Posts: 139 Rating: (25)	The dataeagles support up to 1.5Mbs and our company have used them as well as other wireless solutions in fairly critical aplications including steel works. But as mentioned above timing is critical so you must have a solid installation. Dataeagle also have modems available for profisafe and in these cases you must insure a very good wireless link with little interference from other radio sources and multipath sources. For your application with the limited IO, you will need to weigh the cost of CP card and scalance modems etc versus a wireless profibus solution. If you have future wireless requirements I would suggest the scalance road. but for this I would go wireless profibus. But if there is some way you can go hard wired id do that.
Anchobi Posts: 139 Rating: (25)
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