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03-15-2004, 8:03 AM Saqr Joined on 03-15-2004 Posts 2 Wireless Long Range Networking Hi, We are trying to put together a SCADA package and would like to know what do you guys recommend for a wireless long range networking system. The minimum requirement should be 15 miles. Bandwidth is not really a big issue, we are just looking for a good product that is pretty reliable. Would greatly appreciate your comments and experiences. Regards saqr    Report

03-18-2004, 3:01 AM gmitchell Joined on 12-01-2003 Optomation Systems, Madrid, Spain Posts 143 Re: Wireless Long Range Networking We used Opto22 gear with Ethernet Radios from MDS [www.mdsroc.com] for remote monitoring in a large water distribution project in El Salvador. The distance you need is no problem. The main consideration is that Ethernet 10/100Mbps, is throttled down to 4800Baud through the radios from the base station, and this bandwidth will be shared by all Remote Transceivers. We used the NM-200 TransIt Master Station, NR-100 Remote transceivers and TransIt NMS software. I understand MDS has since developed better solutions. After configuring the radio equipment, Ethernet traffic is transparent to the connected devices. The solution should be used as a star architecture, the base station in the “middle” connected to the physical Ethernet network, communicating to remote outstations. Our experience was that MDS products were high quality, but their entire operation from presales to tech support was low quality. Why use a SCADA? Its just more unnecessary traffic over your radio link. We used OptoDisplay as the operator interface on a FactoryFloor platform. (more than adequate). Apart from a minimum traffic for alarm and historic trends, the only other generated traffic is for the active graphic on-screen. We also used reporting by exception and event driven peer2peer data transfers to reduce traffic to absolute minimum. If you would like more information on the project, feel free to contact.Optomation Systerms admin@optomation.es    Report

04-28-2004, 12:06 PM saqr Joined on 03-15-2004 Posts 2 Re: Wireless Long Range Networking HI ! Thank you for your reply, we have come across MDS and will actually take a deeper look into their solutions. However we have actually been working with a company called CIRRONET and they appear to be pretty advanced as well. Regards saqr    Report

04-30-2004, 3:33 PM barrett Joined on 04-07-2004 St. Louis, MO Posts 27 Re: Wireless Long Range Networking Yes, if you want to do high end links where you can have ioDisplay running and logging controllers at multiple locations over miles of distance and at the same time flash one of the controllers or download an online change or reboot or anything that you can do when you are hardwired on ethernet without interupting ioDisplay, then you need to use the right harware with the right installation. I provide high end TCP/IP links for industrial control which are dead reliable and 4.5 meg duplex rate at 10 miles or 1 meg + at 40-50 miles depending on terrain and cost. Email me if you want to know more. I just installed a WWTP ioDisplay MMI which has no controller located there but talks to three UIOs at three seperate well site locations as well as having a G70 located at one of these panels which can talk to everything else. In fact, I did not even have all the programming finished when I installed it so I finished up on site while the system was in control. I was even able to download updates to the G70 after I installed it without using a laptop. It turns out, there is no time-out when you set the G70 app to download, so I drove out to the site and put the G70 into dowload mode and up it came with the new changes all saved to flash and running....The cost is inline with a licensed or SS technology radio like the MDS but it is TCP/IP all the way. Repeats are transparent.    Report

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