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UDP communication problems.

Created by: Miguel Allende at: 7/14/2009 6:05 PM (2 Replies)

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7/14/2009 6:05 PM	Rate (0)
Miguel Allende Posts: 35 Rating: (0)	Hi! I have programmed the UDP connection in a S7-300 using the example (Sample_open_UDP.zip) provided by Siemens. I works perfectly. The problem is that I'm trying to use the same program but in a S7-400. When I start the application in the S7-400 appears an internal error due to two SFC that are missing.(It can be seen on the attached file). The problem is that both SFC (135 and 136) don't appear in any library... I don't know what to do because it is the same program what I have used in the 300 PLC. Note: I have already changed the parameter on the FC96 concerning the CPU type: In the S7-300 I use B#16#2 and in the S7-400 I use B#16#5. The parameter DEV_ID assigns the Ethernet interface being used: - "DEV_ID=B#16#2" for the CPU31x-2PN/DP or - "DEV_ID=B#16#3" for the CPU319-3PN/DP or - "DEV_ID=B#16#5" for the CPU41x-3PN/DP Thanks a lot. Attachment Siemens SFC error.JPG (217 Downloads)
Miguel Allende Posts: 35 Rating: (0)
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7/14/2009 6:51 PM	Rate (0)
Miguel Allende Posts: 35 Rating: (0)	Ok. I think I have finally found the problem. As can be read on the UDT: 4 connection_type BYTE B#16#11 Protocol variant:· B#16#11: TCP· B#16#12: ISO on TCP· B#16#01: TCP (compatibility mode) 5 active_est BOOL FALSE ID for the way the connection is established:· FALSE: passive establishment· TRUE: active establishment 6 local_device_id BYTE B#16#02 B#16#00:Communication over CP443-1EX4(with S7-400 however only with connection_type =B#16#12)· B#16#02: Communication over the integrated IE interface with CPUs 315-2 PN/DP and 317-2 PN/DP B#16#03: Communication over the integrated IE interface with CPU 319-3 PN/DP B#16#05: Communication over the integrated IE interface of the CPUs 414-3 PN/DP, 416-3 PN/DP and 416-3F PN/DP The function load B#16#13 on the connection_type parameter, although it doesn't appear on the documentation I suppose it means UDP. The problem appears later on the local_devide_id. When I tried the communication with the S7-300 I have a CPU with Ethernet in (I mean, without expansion card). In the other case I have a S7-400 with the CP443. As can be read on the manual if you use this card you only can program ISO on TCP communication. I think this is the answer to the problem but I'm not completely sure because it is very strange that Siemens doesn't allow UDP connection via expansion card. Can anybody confirm it to me? Thank you again so much...
Miguel Allende Posts: 35 Rating: (0)	Last edited by: Miguel Allende at: 7/15/2009 8:19 AM Last edited by: Miguel Allende at: 7/14/2009 6:52 PM
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7/18/2009 1:49 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 1/17/2025 Posts: 3030 Rating: (1058)	Miguel Allende In the other case I have a S7-400 with the CP443. As can be read on the manual if you use this card you only can program ISO on TCP communication. I think this is the answer to the problem but I'm not completely sure because it is very strange that Siemens doesn't allow UDP connection via expansion card. Hello Miguel not too sure where you get the "As can be read on the manual if you use this card you only can program ISO on TCP communication" from (unless you are referring tothe info about Open Ethernet comms via external CP's in S7 400, in which case it is correct). Good news is thatall S7 Ethernet CP's support UDP communication (NOT via Open Ethernet comms blocks though). You will have to do it the good old fashioned way though and configure a UPD connection in NETPRO (instead of of using the Open TCP/IP communcation) and you will also have tothrow away your comms logic and program it all again(examples are provided in the links below, AG_(L)SEND and AG_(L)RECV are now the way to go) Have a look at these links which I trust will help: What are the commonalities and differences between configured communication connections and the open Ethernet communication? What properties, advantages and special features does the UDP protocol offer? What differences are there between the Industrial Ethernet CPs of SIMATIC S7-400?
	Last edited by: fritz at: 7/18/2009 2:01 PM Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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