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Maximum allowable number of connections in WinCC

Created by: EULER1313 at: 9/4/2011 10:54 AM (11 Replies)

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9/4/2011 10:54 AM	Rate (0)
EULER1313 Posts: 86 Rating: (1)	Hi All, Please I want to know the allowable number of connections (PLC Connections) and the allowable number of tags per connection (if any) that i can create in WinCC.. To be more specific, how many PLCs could be connected to WinCC through TCP/IP connections? and what will be the required procedure if extra PLCs have to added later ?
EULER1313 Posts: 86 Rating: (1)	Last edited by: EULER1313 at: 9/4/2011 1:36 PM Last edited by: EULER1313 at: 9/4/2011 11:00 AM
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9/6/2011 8:45 AM	Rate (0)
EULER1313 Posts: 86 Rating: (1)	Any Ideas?
EULER1313 Posts: 86 Rating: (1)
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9/6/2011 10:51 AM	Rate (0)
Navnag Platinum Member Joined: 11/21/2007 Last visit: 9/25/2024 Posts: 2325 Rating: (308)	Hello Sami Limit on no of connections is not clearly documented anywhere ( At least I have not seen it ). However some restrictions are clear : You can only have maximum 8 connections on S7 TCP/IP in basic WinCC licence. However by using a HARDNET card ( CP1613 / CP 1623 ) or by adding adding S7 Softnet full license you can have upto 64 connections. For Profibus & MPI -There must be a limit buti have not come across it so far. We have operated upto 16 S7 CPUs on one network without any problem. Regarding no of Tags - the limit is very clear. It is the Total no of External Tags ( of all the connections defined ) that should be less than the Licence installed. No of tags in each connection is not important. Hope this helps Cheers Navnag
	There is no such thing as the last bug in a program There are no stubborn bugs, There are only stubborn Debuggers.
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9/6/2011 11:26 AM	Rate (0)
EULER1313 Posts: 86 Rating: (1)	Dear Navnag, First I`d like to thank you alot for your response. please be informed that I have found that the maximum number of WinCC connections (TCP/IP) is 64 for SoftNet and 60 for HardNet -as stated in "WinCC V6 Communication Manual" Page 58 (attached)- but i found also that the number of possible connections for CP1623 is 120 - stated in its manual- so i want to know how many PLCs could be connected actually to WinCC -through TCP/IP- and what will be the right produre to follow if i exceed that limit. Attachment WinCC Communication Manual P.58.pdf (2933 Downloads)
EULER1313 Posts: 86 Rating: (1)	Last edited by: EULER1313 at: 9/6/2011 11:28 AM
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9/6/2011 1:35 PM	Rate (0)
Navnag Platinum Member Joined: 11/21/2007 Last visit: 9/25/2024 Posts: 2325 Rating: (308)	Hello The data I am referring is for WinCC Version 7.0. The Technical data clearly states that with IE Softnet lEAN ( Bundled with WinCC V7.0 ) you can have a max of 8 connections. However with IE Softnet FULL ( To be ordered separately ) you can have 64 connections. Of course, you are right, you can have 120 connections with CP1613/1623 ( HARDNET ) Unfortunately this is not clearly given in catalogs / ordering data. The limit is for no of simultaneous / concurrent connections. Even with Softnet you can configure more than 8 connections, but only 8 ( Actually we found the practical limit to be 10 in a real working system ) can be communication at one time. Hope this helps Navnag
	Last edited by: Navnag at: 9/6/2011 1:42 PM Last edited by: Navnag at: 9/6/2011 1:41 PM Last edited by: Navnag at: 9/6/2011 1:37 PM There is no such thing as the last bug in a program There are no stubborn bugs, There are only stubborn Debuggers.
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5/19/2015 5:24 AM	Rate (0)
G_R_E_Y_31 Bronze Member Joined: 5/26/2011 Last visit: 8/5/2024 Posts: 456 Rating: (7)	Hello, This has been a really informative thread. Just wanna ask, would this number of communicating PLC to a WinCC station limitation also applies to S5 PLCs? Thanks!

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5/19/2015 8:32 AM	Rate (0)
Gärchla Posts: 457 Rating: (46)	Hello, regarding S5 connections there will be the same limitations with Ethernet as using S7 PLC. Please see chap 6 of communication manual. In Chap. 7 of communication manual it is described how to connect with Profibus FDL. Max number of connections is 127. If you want to use very more PLCs please design your system using OPC server. As far as I know, Matrikon states that there will be no limitations... Georg
Gärchla Posts: 457 Rating: (46)
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5/19/2015 12:43 PM	Rate (0)
G_R_E_Y_31 Bronze Member Joined: 5/26/2011 Last visit: 8/5/2024 Posts: 456 Rating: (7)	Gärchla Hello, regarding S5 connections there will be the same limitations with Ethernet as using S7 PLC. Please see chap 6 of communication manual. In Chap. 7 of communication manual it is described how to connect with Profibus FDL. Max number of connections is 127. If you want to use very more PLCs please design your system using OPC server. As far as I know, Matrikon states that there will be no limitations... Georg Thanks for response George, how about using Ethernet? Specifically CP1413 (6GK1143-0TA02) on S5 side and CP1613 on PC side. Also side question, I have a request to create backup of already existing WinCC Station connected to the S5 (CPU928B) with the CP1413 above. The the existing old WinCC is v4 running on Windows NT with its own Siemens CP (presumably CP1413). The new CP on the backup WinCC side I could use I think is CP1613, would this also communicate to the old S5 CP1413 with the part number above? Also would there be some changes to be done on the S5 side for this? I'm thinking maybe if I could copy and open the v4 project to the new one (say v7), since the tags and graphics should just be the same (backup), maybe I just have to do some communication settings for the new cp on the PC and maybe no need to change anything on the S5 side, maybe as well as on the WinCC program. What do you think?

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9/28/2015 8:19 PM	Rate (0)
SMatthews Experienced Member Joined: 8/12/2011 Last visit: 4/27/2021 Posts: 65 Rating: (2)	I see this has been a while but I am wondering about the practical limit being 10. I have 11 PLCs connecting to a redundant OS server pair. Can the connections be split across a second NIC on the same network? All 11 PLCs on 172.16.3.x subnet. Would this happen automatically if the NIC is overloaded, or can I create a second TCP/IP connection group and set the parameter to the second NIC? The challenge is no Hard/Soft net used. Navnag Hello The data I am referring is for WinCC Version 7.0. The Technical data clearly states that with IE Softnet lEAN ( Bundled with WinCC V7.0 ) you can have a max of 8 connections. However with IE Softnet FULL ( To be ordered separately ) you can have 64 connections. Of course, you are right, you can have 120 connections with CP1613/1623 ( HARDNET ) Unfortunately this is not clearly given in catalogs / ordering data. The limit is for no of simultaneous / concurrent connections. Even with Softnet you can configure more than 8 connections, but only 8 ( Actually we found the practical limit to be 10 in a real working system ) can be communication at one time. Hope this helps Navnag

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9/29/2015 8:20 AM	Rate (5)
bg2492 Diamond Member Joined: 5/16/2014 Last visit: 9/12/2022 Posts: 7298 Rating: (2166)	Hello SMatthews, if you use a Workstation-OS like Windows 7 you have a limmiation of Network-ressources, and can not have much more the 8 TCP/IP-connections with a common network-adapter. A second networkadapter could not be used, and would not help too in this case. You can have up to 64 connection on a Windows Server OS with a common Networkadapter. Or, you use a Windows 7 with a CP1623, then can you have up to 60 connections. But then you need a additional license "Hardnet". If you have more then 8 connections, you need a license "Softnet" (full) from Simatic Net not from WinCC. 6GK1704-1CW12-0AA0 SOFTNET-IE S7 V12 SIMATIC NET SOFTNET-IE S7 V12 SW F. S7-,S5-COMP.-COMM.,OPC; PG/OP-COMM., CONF. SW, MAX 64 CONN; SINGLE LIC. F.1 INSTALLATION; R-SW, SW + ELECTR. MAN ON DVD; LICENSE KEY ON USB-STICK; CLASS A; 2-LANGUAGES (G,E); FOR 32/64BIT: WIN 7 SP1 PROF/ULT, WIN 8.1 PROF; 64BIT: WINDOWS SERVER 2008 R2 SP1, 2012 R2 CP1612 (NO WIN 8.1, SRV2012R2) Regards Georg Berghof
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