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Working with pointers.

Created by: Fante at: 6/3/2013 3:27 PM (3 Replies)

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6/3/2013 3:27 PM	Rate (0)
Fante Advanced Member Joined: 7/28/2010 Last visit: 7/22/2022 Posts: 15 Rating: (1)	In MicroWIN I could access the pointers and offsets give it a very dynamic way. LD M0.0 +D OFFSET:LD3, PONTEIRO:LD17 And it could also work with the values stored in variables pointer like this: LD SM0.0 MOVD * POINTER: LD17 *, DW_SETPOINT1: LD29 How to do it in Tia portal?

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6/3/2013 4:56 PM	Rate (0)
BryanG2001 Posts: 113 Rating: (22)	I haven't used STL in TIA Portal though I know that you can import a block using External souce files. I have used SCL and the PEEK and POKE functions allow you to use Pointers. If you are trying to view a Real value there is a problem because POKE_DWORD raises a file type mismatch and so I use my new friend, POKE_BLK which lets me PEEK from a Real and POKE to a different Real all in one function.
BryanG2001 Posts: 113 Rating: (22)
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6/4/2013 9:23 AM	Rate (0)
William_B Posts: 5225 Rating: (1170)	Fante, What my friend Bryan suggests is very valid. Have a look at the PEEK and POKE commands. As alternative - for your application - you might benifit from using arrays. Arrays can be read/write in an indexed way. You can create the array in a global datablock if you want the data to be in the "cloud". In SCL it may read as follows #Tag_1 := "Data_block_1".Array[#Index]; But it works perfectly well in LAD too. I have not had a reason to use indirect addressing like in the S7-200 now that this method is available. Let us know if this helps.
William_B Posts: 5225 Rating: (1170)
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9/19/2013 12:50 PM	Rate (0)
O_Moderator Diamond Member Joined: 4/24/2009 Last visit: 2/23/2023 Posts: 2685 Rating: (135)	New question splitted to sample project on array using pointer Best regards O_Moderator
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