Skip to Content

Register Login

Industry Online Support

Technical Forum

Navigation

Simatic S7-300 wireless?

Created by: Gromit at: 10/2/2006 2:27 PM (6 Replies)

Rating (0)

Thanks 0

7 Entries

10/2/2006 2:27 PM	Rate (0)
Gromit Posts: 20 Rating: (0)	Hello. What's the maximal distance, we can cover with Simatic S7-300 wireless modules. What modules do we need? I need 1-2 km. Is it possible, is it a good idea? Can we use some sort of wireless repeaters? Another question - whats the maximal distance for transffering data with Ethernet and Profibus networks, without repeaters? Regards.
Gromit Posts: 20 Rating: (0)
Suggestion To thank Quote Answer

10/3/2006 9:13 AM	Rate (0)
INS Gold Member Joined: 4/6/2006 Last visit: 2/5/2024 Posts: 604 Rating: (56)	Dear Gromit, Yes this is possible. But it depends on how the area looks like. Is it a clear view and is there a line of sight? If the above is so you can think of something like the following: S7-300 PN ----- Scalance W788-1PRO << WDS (approx 1 km is possible)>> Scalance W788-2PRO << WDS (approx 1 km is possible)>> Scalance W788-1PRO ---- ET200S PN IO (256 ms or higher) So for this you need directional antennas. Which antennas you can use depends on the country you live. Normally in every country the 2,4 GHz range is possible. The only thing you have to look for is that the antennas need to be mounted high above the ground for the best possible link. For more information about WDS you can have a look at the following FAQ: How do you set up a WDS connection between SCALANCE W modules? If the distance is shorter it's also possible to have a solution with redundancy. For this redundancy you need 2 Scalance W788-2PRO with a redundant link between them. In a solution like this you can use 2 different ranges like 2,4 and 5 GHz. And offcourse there are also posssibilities to have a communication with GPRS with the new SINAUT GPRS modules. Or a solution with a GSM-modem. Best regards, INS
	Best regards, INS
Suggestion To thank Quote Answer

10/3/2006 3:14 PM	Rate (0)
Gromit Posts: 20 Rating: (0)	Hello, I've read about ranges of up to 30m for indoor and 100m for outdoor applications (IK PI 2005 p.3/90). Are you sure that we can achieve 1000m at 2,4 GHz? So if the longest distance is 100m, do we need 20 Scalance W788-2PRO? Is it possible? What are these 256 ms or higher? Regards
Gromit Posts: 20 Rating: (0)	Last edited by: Gromit at: 10/3/2006 3:15 PM
Suggestion To thank Quote Answer

10/3/2006 3:43 PM	Rate (0)
INS Gold Member Joined: 4/6/2006 Last visit: 2/5/2024 Posts: 604 Rating: (56)	Dear Gromit, For every Wireless system it's always usefull to contact a specialist. Specialist have much more knowledge about the system as what is written down in a catalogue. So in you case you need to realize communication over a distance from up to 1000 m. With the standard antennas this won't be possible but with the directional antennas (ANT792-8DR)is it possible to handle distances which are up to 1000 meter. This is only possible if you have a clear line of sight and the antennas are installed at a proper height described in the catalogue as: "Reichweite bei freier Sicht ohne Störung: 1000 m. So the information in the catalogue is correct but is for the standard antennas and in aworst case situation. But if you want to be really sure and if it's is possible I suggest to contact your local Siemens Technical Support for more information about a solution with Industrial WLAN. Best regards, INS
	Best regards, INS
Suggestion To thank Quote Answer

10/3/2006 11:22 PM	Rate (0)
J_Bell Posts: 5822 Rating: (412)	Hello to you both, INS, you are right. But I would recommend in this situation to post at least one Repeating station in between. So you can count on 500 m with the directional Antennas and the WDS System on 2,4 and 5 GHz. This should work than. I have seen this working, really. Best regards J_Bell
J_Bell Posts: 5822 Rating: (412)
Suggestion To thank Quote Answer

10/4/2006 8:24 AM	Rate (0)
INS Gold Member Joined: 4/6/2006 Last visit: 2/5/2024 Posts: 604 Rating: (56)	Dear J_Bell, It can also be done by a solution with a repeater but sometimes it's not possible to place a station in between. So when there is no possibility to place a W788-2PRO in between it is still possible to create a solution without this over such a distance if the environment (line of sight, antenna placed high) is good. But in my opinion it's not possible to have a redundant link in this solution. This because the Scalance W788 need to be connected over the exact same channel. The 1st Scalance W788 can be connected to the 1st interface of the 'repeater' with 2,4or 5GHz. On the 2nd interface of the 'repeater' you can have a link to the 3rd W788 with 2,4 or 5GHz. So you can't use both ranges for the same link. W788 << WDS1 2,4 GHz >> W788-2 << WDS2 5GHz>> W788 If you want to have a redundant link you can use two Scalance W788-2 with the redundancy future enabled. But then both interface are used for the same link and it's not possible to use these in a solution with a repeater. Best regards, INS Edit: Mistyped something!
	Last edited by: INS at: 10/4/2006 8:30 AM Best regards, INS
Suggestion To thank Quote Answer

1/30/2008 11:31 PM	Rate (0)
Thosch_lb Posts: 9 Rating: (0)	If you use 2.4GHz WLAN 802.11 a,b,g in ranges above 100m outdoor you have to think about the availibility of the radiolink. WLAN is very very sensitiv for interferences. If you use profinet IOwireless connection you will have a lot of buserrors. If you use TCP/IP may be you feel only some timedelays when TCP has to resend lost data. Profinet will cut the internal connection immediatly if you have smallest interferences of some100ms, which will be normal by this distances. Maybe 1km can work in some applications which are not time critical, line-of-sight, no other WLAN transmitters in the area. With my experiance of about 2000 wireless project this are about 1 per 100. We use wireless profibus also with 868/900MHz moduleswith more transmitting power up to 4 km, which runs on theprofibus cableside with 1.5Mbit and are really transparent. www.schildknecht.info Attachment GB_DE_3x0x.pdf (599 Downloads)
Thosch_lb Posts: 9 Rating: (0)
Suggestion To thank Quote Answer

|

Share this page:

Share this page on...

Related topics by keywords:

Communication General

Follow us on