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TUSEND problem

Created by: MarjanMM at: 12/9/2013 4:10 PM (7 Replies)

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12/9/2013 4:10 PM	Rate (0)
MarjanMM Posts: 51 Rating: (1)	Hello, I have S7-1212 AC/DC/Rly and I am trying to sen data (STRING) over Ethernet. I am having problem with it, because when I try to download I get an error. Plase see attachments of my configuration. What am I doing wrong Attachment New Picture (1).jpg (411 Downloads)
MarjanMM Posts: 51 Rating: (1)
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12/9/2013 4:11 PM	Rate (0)
MarjanMM Posts: 51 Rating: (1)	Another. Attachment New Picture 2.jpg (407 Downloads)
MarjanMM Posts: 51 Rating: (1)
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12/9/2013 4:12 PM	Rate (0)
MarjanMM Posts: 51 Rating: (1)	And another. Attachment New Picture.jpg (364 Downloads)
MarjanMM Posts: 51 Rating: (1)
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12/9/2013 5:27 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/11/2024 Posts: 15491 Rating: (2456)	MarjanMM Hello, I have S7-1212 AC/DC/Rly and I am trying to sen data (STRING) over Ethernet. I am having problem with it, because when I try to download I get an error. Plase see attachments of my configuration. What am I doing wrong Ambiguous addresses can mean you used a DB # more than once, an FB/FC/OB number more than once, or more than one plc tag points to the same memory address.
	science guy
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12/11/2013 11:14 AM	Rate (0)
MarjanMM Posts: 51 Rating: (1)	Hello, I have looked at the sample onhttps://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objid=67196808&caller=view. I am trying to do this: S7-1200 has to send a string ('MyString') over TCP to my router (192.168.1.1) on port 3001. I have problems with doing this. Can anyone tell me how to do this wright? Can anyone please attache any sample program for this?!! Best regards
MarjanMM Posts: 51 Rating: (1)
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12/11/2013 4:14 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/11/2024 Posts: 15491 Rating: (2456)	MarjanMM Hello, I have looked at the sample onhttps://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&lang=en&objid=67196808&caller=view. I am trying to do this: S7-1200 has to send a string ('MyString') over TCP to my router (192.168.1.1) on port 3001. I have problems with doing this. Can anyone tell me how to do this wright? Can anyone please attache any sample program for this?!! Best regards S7 string is not a tcp string. A tcp string is a series of characters. To get to the characters within your s7 string "MyString", you need to access the absolute address of your string. If the DB containing your string is set up for symbolic addressing, you will need to change it (V12) or recreate it (V11) using s7-300/400 compatibility mode. Then let's say the db (DB1) only contains "MyString" with the actual string length you are sending is 30 characters long. P#DB1.DBX2.0 BYTE 30 is what you pass to your TUSEND block for your characters. It starts at the first character within the string, and passes in the 30 character length of your string. Hope this is helpful. If you do not have wireshark, I suggest checking it out to see what the plc is sending while you iterate through your project solution. It is difficult to know when it starts sending and the router is ignoring it because of a malformed instruction.
	science guy
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12/11/2013 10:27 PM	Rate (0)
MarjanMM Posts: 51 Rating: (1)	Hello, I have managed to do semthing. What do you think, will it work? Best regards Attachment SEND STRING_S7-1200.zip (352 Downloads)
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12/11/2013 10:49 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 12/11/2024 Posts: 15491 Rating: (2456)	MarjanMM Hello, I have managed to do semthing. What do you think, will it work? Best regards Problem 1 may be intentional so you can toggle the enable input for the FC_SEND block, but M0.1 is not always on because the plc system memory checkbox is not checked. Problem 2 is this pointer for your send block : P#DB3.DBX0.0 BYTE 14 Should be: P#DB3.DBX2.0 BYTE 14 If you look at the actual memory at DB3.DBB0 (pointed at by P#DB3.DBX0.0 BYTE 1), that is one of the length attributes. It is either 14 or 254, and the second byte is either 254 or 14 (I don't remember the order of the length bytes for a string). The first character "M" will be at byte 2. Then when you toggle REQ input from 0 to 1, it will initiate a send. The LEN input needs to be the length of your string. You can also pass (see problem 2 above): P#DB3.DBX0.0 BYTE 254 and send the entire string to the send block and use the LEN input using the LEN(MyString). Then it will always send your entire string and you do not need to keep changing the byte length. The last thing that is not necessarily a problem, but I tend to think of the REQ input as something I can turn off the next scan after it is turned on. As such, I tend to just one-shot it into the block. That way, no matter how bad I mess up the handling of the done/error/busy, I only ever get one request for each pulse of the REQ line and can toggle it back on as soon as I get an error/done bit. This is programmer preference though and not really a problem. Pretty close for sure.
	science guy
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