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Wireless Profibus

Created by: Junghans at: 3/10/2009 8:17 PM (12 Replies)

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3/10/2009 8:17 PM	Rate (0)
Junghans Posts: 10 Rating: (0)	Hello! I wonder ifyou have any experience using ELPROtech for wireless profibus communication? I might consider using 105U-G-PR1 Profibus DP Slave interface 105U-G-PR2 Profibus DP Master interface to communicate with 5 Profibus nodes. Thisproductsupportsfull Profibusspeed(9600 bit/s - 12 Mbit/s)and has GSD file for S7
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3/10/2009 9:19 PM	Rate (0)
INS Gold Member Joined: 4/6/2006 Last visit: 2/5/2024 Posts: 604 Rating: (56)	Hi, I don't have exprience but I think it could be imporant for you to know that the speed over the Wireless Link isn't as fast as you have written. This speed is only available on the wired ports. THat means that the bus speed and bus cycle time will be affected with an unknown delay due to the wireless transmission. In the specification they don't talk about this. A better solution for connecting nodes wireless would be via real Wireless LAN for example. An interesting solution could be a CPU with a Ethernet Interface which is capable of being ProfiNet IO Controller. You could connect a Scalance W AP with as a client an IWLAN/PB Link which is PN IO Device and a ProfiBus Master. Behind this master you can connect all availble Profibus Slaves. With such a solution you don't have the delay of the Wireless Transmission for your complete bus system. This since the IWLAN/PB Link has his own specific PN IO Update time which could be lower then for the devices connected over wires. This would be a very stable solution which is already used all over the world. Below you will find a link to a reference application: https://www.automation.siemens.com/net/html_76/newscenter/firma_schmolz-hochregallager.htm
	Best regards, INS
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3/10/2009 9:36 PM	Rate (0)
Junghans Posts: 10 Rating: (0)	Thank you INS! WLAN was also my first proposal. The problem is that the customer has been advised by its own IT experts, not to use WLAN because of security. So I am now trying to find an alternative. The speed ofProfibus is not critical, neither of the wirelesspart or other components on the bus.
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3/11/2009 10:09 AM	Rate (0)
INS Gold Member Joined: 4/6/2006 Last visit: 2/5/2024 Posts: 604 Rating: (56)	Hi, Just give it a new shot with using iPCF this a slightly changed version of Industrial Wireless LAN. When you enable this normal laptops or normal WLAN clients are not able to connect to the network. And for IO solutions the wireless network, which is a shared medium, becomes more deterministic then regular WLAN. It's a own solution form Siemens and ecause of this it only works with Siemens IWLAN device llike Scalance W, IWLAN/PB Link PN IO or ET200PRO IWLAN HF. I think that you can convince the IT Specialist with this information. This same devices and technologies are used all over the world at firms from which is also very well known firms where safety restrictions are very high. And otherwise have a look on the area where you need this maybe you could a solution with a RCoax antenna which is a near field solution which means that the signal isn't transmitted as far as with regular omni directional antennas.
	Best regards, INS
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3/11/2009 1:59 PM	Rate (0)
Junghans Posts: 10 Rating: (0)	I will try! I can see that IWLAN / PB Operating temperature is from 0 ° C to 60 ° C. Itwill be instelled ina small unheatedpanel (Europeen winter temp. down to -10 ° C). It wants to beon all the time. Do youthink that it cansurvive negativ temperatures? (Siemens has probably a little margin for this)
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3/11/2009 2:07 PM	Rate (0)
INS Gold Member Joined: 4/6/2006 Last visit: 2/5/2024 Posts: 604 Rating: (56)	Hi, I think this is a choice you must make yourself. But maybe there is a different solution. What kind of device(s) do you want to connect behind the IWLAN/PB Link PN IO? Are they only available as ProfiBus device?
	Best regards, INS
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3/11/2009 2:38 PM	Rate (0)
Junghans Posts: 10 Rating: (0)	It don't have to be Probibus. My idea was to connect ET200S via Profibus-> wireless-> PLC.ET200Swill be equipt witch few AI / DI / DO and maybe 2 motor starters. But whatwas your other option?
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3/11/2009 2:46 PM	Rate (0)
INS Gold Member Joined: 4/6/2006 Last visit: 2/5/2024 Posts: 604 Rating: (56)	Hi, What do you think about this solution? ET200pro IWLAN
	Best regards, INS
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3/11/2009 8:44 PM	Rate (0)
Junghans Posts: 10 Rating: (0)	It was perhaps a solution! You wrote in an earlier thread that there is possible to configure up to4 IM154-6 PN IWLAN per. Scalance. Is it possible to expand this number to 6using fxIWLAN DUAL ACCESS POINT SCALANCE W788-2PRO? Best regards. Junghans
Junghans Posts: 10 Rating: (0)	Last edited by: Junghans at: 3/11/2009 9:02 PM
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3/11/2009 10:37 PM	Rate (0)
INS Gold Member Joined: 4/6/2006 Last visit: 2/5/2024 Posts: 604 Rating: (56)	Hi, Yes such solutions are possible. But then you need 2 wireless channels without interferences. Depending on how your application is build it could be possible to get a solution with more then 4 PN IO Devices on one AP. Important to know is the PN IO Update time you need in your application. And can you give an overview of the area of installation? This would help giving you an advice for the best solution.
	Best regards, INS
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