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Load after LAR1 and LAR2

Created by: Gelo_Rus at: 1/14/2020 11:02 AM (4 Replies)

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1/14/2020 11:02 AM	Rate (0)
Gelo_Rus Posts: 13 Rating: (0)	Hello all! Can you help me to resolve one question? I cant to receive value after operator LAR1, LAR2. Before the operator I have not any problems. I probably don’t know about some kind of restriction. SEG1: NOP 0 //--------------------------------------------- //------------INIT_READING_REGISTERS ---------- //--------------------------------------------- L #ID_ADR // OK Correct data T #VALUE_VMAX // OK AUF DB [#n_db_send_temp] L #N_DBB_SOURCE SLD 3 LAR1 L #N_DBB_SEND SLD 3 LAR2 L #ID_ADR // NOK Wrong data T DBB [AR2,P#0.0] // NOK L B#16#3 T DBB [AR2,P#1.0] L DBW [AR1,P#0.0] T DBW [AR2,P#2.0] L 1 T DBW [AR2,P#4.0] L #N_DBB_SEND T #N_DBB_S L 6 T #LEN L 0 T #N_DBB_R SPA m002 Attachment stl.jpg (225 Downloads)
Gelo_Rus Posts: 13 Rating: (0)	Last edited by: Gelo_Rus at: 01/14/2020 11:28:06
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1/14/2020 11:29 AM	Rate (2)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 1/13/2026 Posts: 5154 Rating: (772)	Is this code of an FB? It's not allowed to change content of the AR2 in FBs. If you fail to observe this rule all symbolic accesses to FB's interface (but not TEMP) will malfunction.
	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 4 thankful Users Gelo_Rus Towome zzVss bobswan

1/14/2020 11:45 AM	Rate (0)
Gelo_Rus Posts: 13 Rating: (0)	Thank you for your answer! It's work! It was FB. I did not know about this restriction. Can you tell me how you know about this restriction. I did not come across it in the documentation.
Gelo_Rus Posts: 13 Rating: (0)
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1/14/2020 1:12 PM	Rate (1)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 1/13/2026 Posts: 5154 Rating: (772)	C:\Program Files (x86)\Siemens\Step7\README.RTF, chapter 6.16 "The DI register and the address register AR2 are used by the system for the function block and multiple-instance CALL and must not therefore be changed within function blocks."
	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 1 thankful Users Gelo_Rus

1/15/2020 12:32 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 1/13/2026 Posts: 3054 Rating: (1062)	Hello Gelo_Rus see also Entry ID 14628680 FAQ In which operations does Step 7 overwrite accu or register contents?
	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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This contribution was helpful to 1 thankful Users Gelo_Rus

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