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Pointer in S7 program

Created by: chintu at: 4/12/2007 3:27 PM (22 Replies)

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4/12/2007 3:27 PM	Rate (0)
chintu Advanced Member Joined: 12/15/2006 Last visit: 9/27/2011 Posts: 29 Rating: (1)	Dear Friend, Can you tell me how i can use pointer in my s7 program. Regards

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4/12/2007 5:19 PM	Rate (0)
Denilson Pegaia Platinum Member Joined: 9/23/2005 Last visit: 12/8/2019 Posts: 3750 Rating: (1038)	Hi, The online help of the ladder editor has some examples. Try to go to LAD/STL/FBD Editor, Help, Help to STL, Find, type ANY, select ANY_PTR, select the topic "Example of the Data Type ANY"
	Denilson Pegaia Siemens Industry Sector Technical Support
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4/23/2007 2:15 PM	Rate (0)
Smurf Silver Member Joined: 9/28/2005 Last visit: 5/7/2018 Posts: 413 Rating: (28)	Hi, See also * Statement List (STL) for S7-300 and S7-400 Programming (Chapter 9) * Programming with STEP 7 V5.4(Appendix A)
	Smurf "The only difference between a problem and a solution is that people understand the solution."
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4/25/2007 7:22 AM	Rate (0)
chintu Advanced Member Joined: 12/15/2006 Last visit: 9/27/2011 Posts: 29 Rating: (1)	Dear Smurf & pegaia Thankx for giving information, i have gone though information given by you. I got solution of my question. thanks once again. regards chintu

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4/25/2007 11:52 AM	Rate (0)
Mi-k-l Advanced Member Joined: 4/17/2007 Last visit: 9/4/2007 Posts: 41 Rating: (1)	I'm sorry but I haven't unterstand how use pointer? I'm bad I read all but I don't arrive. I explain you my situation. I have a DB. In this DB, i have a backup of my pointer(in DW type) and datas in format UDT (my UDT has 2 datas in byte type). The DB contains 200 UDTs and the backup. I would like to use a pointer to adress the data1, data2... In the fuction where I use call the DB, I have a temporary variable. I would like to set his variable to the first UDT data (at the adress 10.0). Can I use p#db500.dbx10.0 to set the pointer? Best regards, Mi-k-l
	-------------------------------------------------------------------- A french student who is beginning on the software step7 ^^ --------------------------------------------------------------------
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4/26/2007 8:46 AM	Rate (0)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 12/6/2019 Posts: 2357 Rating: (345)	Mi-k-l I have a DB. In this DB, i have a backup of my pointer(in DW type) and datas in format UDT (my UDT has 2 datas in byte type). The DB contains 200 UDTs and the backup. I would like to use a pointer to adress the data1, data2... In the fuction where I use call the DB, I have a temporary variable. I would like to set his variable to the first UDT data (at the adress 10.0). Can I use p#db500.dbx10.0 to set the pointer? Could you clarify what do you mean by "pointer(in DW type)" ? APOINTER data type is 6 bytes long and as such can't be loaded at once like this: L p#DB500.DBX10.0 T my_pointer It (a POINTER) can be used as input parameter and then it can be assigned in the following way: CALL FC 1 IN0:=P#DB500.DBX 10.0 //IN0 of type POINTER In this case a compiler taks care of correct passing data. Otherstory is accessing data indirectly. A POINTER data type is not suitable for this. To achieve what I think you are after see the code below: OPN DB 500 //you have to open DB for access L P#DBX 10.0 //load address constant T MD 0 //store it somewhere L DBB [MD 0] //use indirect access to DB byte
	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.
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4/26/2007 11:19 AM	Rate (0)
Mi-k-l Advanced Member Joined: 4/17/2007 Last visit: 9/4/2007 Posts: 41 Rating: (1)	Thank you for your reply! I manage to write in my db. But I have noted taht if I want to go to the next data, I have to incerase my memento with the offset of my variable's type. Isn't it? Regards Mi-k-l
	Last edited by: Mi-k-l at: 26.04.2007 11:37 -------------------------------------------------------------------- A french student who is beginning on the software step7 ^^ --------------------------------------------------------------------
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4/26/2007 3:14 PM	Rate (0)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 12/6/2019 Posts: 2357 Rating: (345)	Right. Try something like this: L MD 10 L p#2.0 +D T MD 10
	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.
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4/27/2007 12:33 PM	Rate (0)
Mi-k-l Advanced Member Joined: 4/17/2007 Last visit: 9/4/2007 Posts: 41 Rating: (1)	jacek d Right. Try something like this: L MD 10 L p#2.0 +D T MD 10 Is p#2.0 the offset of my variable type 2?? I have a question. Again I want to compare my current address of my variable with a fixed address. I put the fixed address in a MD variable. Finally, I compare MD0 to MDx. If the compare is equal or superior, a set MD0 to the initial address. The problem is: it doesn't work!!! Michael
	-------------------------------------------------------------------- A french student who is beginning on the software step7 ^^ --------------------------------------------------------------------
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4/27/2007 1:24 PM	Rate (0)
Aret Platinum Expert Joined: 10/31/2005 Last visit: 7/15/2015 Posts: 2348 Rating: (244)	To compareoffsetstheeasiestwayis: L MD10 AD dw#16#FFFFFF L P#P345.6 //offset with which you want to compare >D ...

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