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S7-1200 - Indirect Addressing of data within a DB

Created by: Naaltje at: 3/27/2014 12:40 PM (12 Replies)

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3/27/2014 12:40 PM	Rate (0)
Naaltje Experienced Member Joined: 9/28/2012 Last visit: 11/30/2023 Posts: 75 Rating: (3)	I like the topic and believe the question should be posted here concerning tia portal basic, ldr program, s7-1200, db1=Data_block_1, I have a db1 filled with data on adres 2,3,4,5,6,7 and 8. I want to use the data on these adresses as a recipie for that day. The recipie contains "int". I have also a counter that is counting 1 to 8. I want to move the recipie of that day to another db simply using indirect pointing as the counter value is the pointer. for direct adressing i use "Data_block_1"."2" on the in tag of the move instruction. This is working fine. For indirect adressing i thought to change the in statement to "Data_block_1"."[#"counter".CV]". But somehow this is not working. anybody has an idea how to solve this laantje
	Last edited by: CS Moderator at: 3/31/2014 3:36 PM new subject after splitting from /tf/WW/en/Posts/93864#top
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3/27/2014 1:04 PM	Rate (0)
ramiv Posts: 55 Rating: (1)	Hi could you post a printscreen from your DB 1 definition?. See attachments.. Attachment DB2.jpg (884 Downloads)
ramiv Posts: 55 Rating: (1)	Last edited by: ramiv at: 3/27/2014 1:16 PM Last edited by: ramiv at: 3/27/2014 1:05 PM
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3/27/2014 1:16 PM	Rate (0)
ramiv Posts: 55 Rating: (1)	And the progam code to access the data. This is ofcourse a simplified example, you should check that CV is not <1 and it is <= 10 and so on, but you get the idea. Attachment OB1.jpg (962 Downloads)
ramiv Posts: 55 Rating: (1)	Last edited by: ramiv at: 3/27/2014 1:19 PM
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3/27/2014 1:51 PM	Rate (0)
Naaltje Experienced Member Joined: 9/28/2012 Last visit: 11/30/2023 Posts: 75 Rating: (3)	here i have some sceenshots of the program and DB see also next message Attachment dbase.JPG (762 Downloads)

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3/27/2014 1:53 PM	Rate (0)
Naaltje Experienced Member Joined: 9/28/2012 Last visit: 11/30/2023 Posts: 75 Rating: (3)	and this is number 2 the program Attachment program.JPG (836 Downloads)

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3/27/2014 2:52 PM	Rate (0)
ramiv Posts: 55 Rating: (1)	Hi i believe you have to define an array of desired type for the DB and this can then be accessed as you would like, see my example DB definition and access.
ramiv Posts: 55 Rating: (1)
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3/27/2014 3:24 PM	Rate (0)
Naaltje Experienced Member Joined: 9/28/2012 Last visit: 11/30/2023 Posts: 75 Rating: (3)	Hi Ramiv That's it. I took your example and that worked. Thanks for your cooperation Laantje

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3/27/2014 4:14 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 1/16/2025 Posts: 15539 Rating: (2465)	laantje Hi Ramiv That's it. I took your example and that worked. Thanks for your cooperation Laantje With the s7-1200, you can also PEEK into your DB using SCL with indirect addressing. Array is better for indexing, but if you want to read your data and it is not in an array, PEEK_WORD, PEEK_BYTE, and so on can do it.
	science guy
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3/28/2014 11:00 AM	Rate (0)
Naaltje Experienced Member Joined: 9/28/2012 Last visit: 11/30/2023 Posts: 75 Rating: (3)	Hi Huggy Can you give me an example how laantje

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3/28/2014 1:02 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 1/16/2025 Posts: 15539 Rating: (2465)	laantje Hi Huggy Can you give me an example how laantje What have you tried so far?
	science guy
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