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Strange block from online PLC

Created by: PxxC at: 6/16/2021 2:40 PM (9 Replies)

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6/16/2021 2:40 PM	Rate (0)
PxxC Posts: 10 Rating: (0)	Hello, I recently had to deal with an S7-400 controller. After doing a program upload from the controller, there were errors in the OB1 block as shown below: The controller works and does not report any error. Could someone please explain to me where these Call and End Call instructions come from ?
PxxC Posts: 10 Rating: (0)
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6/16/2021 3:10 PM	Rate (0)
0_Einstein Grandmaster Joined: 7/7/2010 Last visit: 12/23/2025 Posts: 16325 Rating: (2520)	It looks like TIA Portal inserted the Call / End Call during the upload. I think if you moved everything in the first call to it's own network, and everything in the 2nd call to its own network, the call / end call could be safely removed. I am probably wrong because I know very little about STL. However, I do know how programmers think. By having a call in the middle of a single STL "network", TIA Portal seems to have inserted { } around the code before and after to separate them. In STL, it looks like { } is call and end call. PxxC Hello, I recently had to deal with an S7-400 controller. After doing a program upload from the controller, there were errors in the OB1 block as shown below: The controller works and does not report any error. Could someone please explain to me where these Call and End Call instructions come from ?
	science guy
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6/16/2021 3:39 PM	Rate (0)
qwazee Platinum Expert Joined: 3/30/2020 Last visit: 12/11/2025 Posts: 5656 Rating: (1082)	The code would make sense if the red marked lines were comments: // Call .. // End Call
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6/16/2021 3:50 PM	Rate (0)
PxxC Posts: 10 Rating: (0)	Thank you for your response. First I would like to point out that this is NOT TIA Portal. This is classic STEP 7 software. The question is why does this happen or is it a problem with the STEP 7 version ? In the controller the program works fine, I have to make a change in this block but I can not afford to make an mistake when downloading the block to the PLC
PxxC Posts: 10 Rating: (0)
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6/16/2021 3:54 PM	Rate (0)
PxxC Posts: 10 Rating: (0)	qwazee The code would make sense if the red marked lines were comments: // Call .. // End Call Yes I know. But this is uploading directly from the PLC. I have no idea where these "call" and "end" instructions come from.
PxxC Posts: 10 Rating: (0)
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6/16/2021 3:57 PM	Rate (0)
qwazee Platinum Expert Joined: 3/30/2020 Last visit: 12/11/2025 Posts: 5656 Rating: (1082)	PxxC Thank you for your response. First I would like to point out that this is NOT TIA Portal. This is classic STEP 7 software. The question is why does this happen or is it a problem with the STEP 7 version ? In the controller the program works fine, I have to make a change in this block but I can not afford to make an mistake when downloading the block to the PLC The response to your question would not change whichever software you are using. (But please post in the right conference next time.) I have to ask how you know that THAT piece is being executed and that there is no response from the PLC. Depending on the configuration of the PLC, some issues can be ignored. Also .. does the online and offline programs compare to be exactly the same? If it was me, I would make those line comments. But there is no reason to speculate -- use the "Support Request" web link and ask Siemens' Support team directly on what you are seeing. If a user comes through with an answer, then at least you will get answers from 2 sources. Let me know if you get a response from Siemens.
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6/16/2021 4:40 PM	Rate (0)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 12/23/2025 Posts: 5149 Rating: (772)	PxxC Could someone please explain to me where these Call and End Call instructions come from ? Yes.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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This contribution was helpful to 2 thankful Users qwazee PxxC

6/17/2021 7:10 AM	Rate (0)
PxxC Posts: 10 Rating: (0)	Jacek d thank you for your reply, it makes sense.
PxxC Posts: 10 Rating: (0)
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6/3/2024 9:46 PM	Rate (0)
DCJBS Member Joined: 10/22/2021 Last visit: 1/21/2025 Posts: 1 Rating: (0)	PxxC Jacek d thank you for your reply, it makes sense. Regards, solved the problem? I have the same situation. thanks.

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6/4/2024 4:27 AM	Rate (0)
qwazee Platinum Expert Joined: 3/30/2020 Last visit: 12/11/2025 Posts: 5656 Rating: (1082)	diegocostaJBS PxxC Jacek d thank you for your reply, it makes sense. Regards, solved the problem? I have the same situation. thanks. The answer (link) by Mr Jacek will solve your problem if you have exactly the same problem.
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