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Loss of UDT defined symbols from the DB and FB in an Uploaded Step 7 Programm

Created by: Ambrose at: 4/17/2012 5:39 PM (7 Replies)

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4/17/2012 5:39 PM	Rate (0)
Ambrose Posts: 11 Rating: (0)	Hi Guys I developed a Step 7 programme using DBs and FBs. For faster developement I made personal UDTs and FBs. Some FBs are called by others in the STAT interface, as well some DB structures are defined using UDTs. This worked well and pretty faster during development and implementation. I downloaded the programme into the controller and it is working fine. Now, here is the biggest challenge though . When I upload the programm into the PG, as usal and expected, it comes with no comments. Normally I would copy the symbol table from the original programm and add into the uploaded project making the symbols available once again. However, in this case only those symbols defined in the symbol table are restored but those defined in the UDT and called FBs are not restored. Since am well aware that UDTs are the ones that define the structure and length of the DB into which it is called and that it is not downloaded into the controller, I went ahead and copied all the UDTs from the original programm into the uploaded programm. But this did not help. See attached for sample FB and DB in both the original and uploaded programm as well as one of the UDTs I used Can anyone please point me into the right direction......... Attachment FB_DB_UDT_In_Original_and_Uploaded_Progam.pdf (157 Downloads)
Ambrose Posts: 11 Rating: (0)	Last edited by: Ambrose at: 4/17/2012 5:55 PM
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4/18/2012 4:29 PM	Rate (1)
Cicero Gold Member Joined: 10/10/2005 Last visit: 3/16/2023 Posts: 1909 Rating: (132)	Hello, during the download the symbols are not transfered to the CPU and if you have not the original project, the symbols are not included after upload. But you can export the symbols in an excel list before and after upload the symbols import from excel to the STEP 7 project. See the following FAQs in the internet for your support. http://support.automation.siemens.com/WW/view/de/22781586 http://support.automation.siemens.com/WW/view/de/16893267 http://support.automation.siemens.com/WW/view/de/24352635 With best regards Cicero

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4/23/2012 8:02 AM	Rate (0)
Ambrose Posts: 11 Rating: (0)	Thanks Cicero for your response. The document contains instructions that only works with symbols that are defined in the symbol table and/or DBs that are created using Source files. It does not in any way deal with DBs and/or DBs whose structures are defined using UDTs. As I earlier said, am able to restore those symbols defined in the symbol tabe but the only proble is with symbols defined in the UDTs.....
Ambrose Posts: 11 Rating: (0)	Last edited by: Ambrose at: 4/23/2012 8:03 AM
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4/23/2012 8:37 PM	Rate (0)
Marciano Bronze Member Joined: 4/30/2007 Last visit: 3/9/2023 Posts: 231 Rating: (23)	Hello Ambrose Have you defined a symbol for your DB's? Plus you need to update your Datablocks with your new (copied) UDT's, using the 'Check and Update Accesses" individually for each DB, also check the "Check Block Consistency..." in theSimaticManager.

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4/24/2012 12:27 PM	Rate (0)
Ambrose Posts: 11 Rating: (0)	Hello Marciano, In the symbol tabel I have defined, I/Os and syybolic names of the FBs, DBs and UDTs is created. All these symbols (the ones defined in the symbol table) do update the Uploaded program after I copy the symbol table from the original program into the Uploaded program. The structure of the DBs and hence symbols are defined by the respective UDTs that is referenced There a symbols defined inside the UDTs...the symbols I do want in the DBs. I used UDTs because I had to create several DBs of the same structure...for instance motor DBs I copied all the referenced UDTs into the uploaded program but the symbols in the DBs neva get to update. I tried "Check and Update Accesses" but did not help The "Check Consistency" function is inactive-grayed out......
Ambrose Posts: 11 Rating: (0)
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4/24/2012 2:33 PM	Rate (0)
Marciano Bronze Member Joined: 4/30/2007 Last visit: 3/9/2023 Posts: 231 Rating: (23)	I see now, actually what you are trying to do is not possible, copying DB’s from online will not reference back to the UDT’s. But if you have the original project, just copy the Datablocks to the uploaded project. And by the way, why you are uploading the entire project from the PLC if you have the original S7project? If you need your DB values online, you can just copy the Online DB’s back to the offline project!

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4/26/2012 8:03 PM	Rate (0)
Jazz_M Gold Member Joined: 9/6/2008 Last visit: 5/7/2022 Posts: 1121 Rating: (86)	Hi well from my personel experience, using UDTd is faster but it has lot if's and but. furthermore your size of the block increase more than 2 or 3 times of normal size. So for your case do not use UDt call as you will not be able to upload the symbol table name,as your case states. Have fun...
	Jazz
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4/28/2012 8:29 AM	Rate (0)
Aret Posts: 2348 Rating: (259)	Dear Ambrose, can you try following (not 100% sure it would work, but can try) - make a copy of source project, open it, open PLC online and copy blocks from online to offline via drag-and-drop? Could you verify if such scheme allows to save symbolic names?
Aret Posts: 2348 Rating: (259)
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