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The data block is too large

Created by: majklkl at: 9/20/2012 2:45 PM (4 Replies)

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9/20/2012 2:45 PM	Rate (0)
majklkl Experienced Member Joined: 7/17/2012 Last visit: 9/26/2024 Posts: 41 Rating: (3)	Hi, when I try to compile my program, I get this message. What is the maximum allowed size of data block? I have S7-12006ES7 214-1AG31-0XB0 with 75KB memory with 2MB MC inside. (do I need to set the memory card somewere in TIA Portal?) The data block have about 2000 variables (with 400 of string type) I can split it for several DB, but I'm not sure how much DB I need.

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9/20/2012 4:23 PM	Rate (1)
bit7 Experienced Member Joined: 7/26/2008 Last visit: 11/22/2024 Posts: 100 Rating: (19)	Hi Majklkl, the first item to check is that you did not use the default string length of 256 bytes, which will end up consuming 102 400 (= 400 * 256) bytes. Specify string length with string[32] as data type. I find 32 bytes is often adequate.

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9/21/2012 9:24 AM	Rate (0)
majklkl Experienced Member Joined: 7/17/2012 Last visit: 9/26/2024 Posts: 41 Rating: (3)	Hi, thanks It really helped, when I changed size of string to 32 bytes, but I still have a little problem with Work memory. The DB is using 80% of resources. I have MMC 2MB, I don't want to use the DB all the time, but only when it's needed (I keep archive data in these DB and I want to display on KTP1000 only after pressing the button). Is it possible to solve this problem?

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9/21/2012 4:22 PM	Rate (1)
crazyCow Gold Member Joined: 12/4/2009 Last visit: 11/25/2024 Posts: 453 Rating: (136)	Dear majklkl, You can declare DB as unlinked, or execution-non-relevant. This is being done in DB properties -> Attributes -> Store only in load memory. Using this procedure your large data block will be copied to load memory only. Work memory should not be affected. Data is being fetched using commands READ_DBL and WRIT_DBL in your user program. You can use your panel to trigger event that would fetch some smaller amount of data to one brand new shared DB of significally smaller size, and then display it on TP respectively. Hope this helps.
	Last edited by: kjurlina at: 9/21/2012 4:38 PM Last edited by: crazyCow at: 3/29/2016 1:24:38 PM If this post actually helped, you may consider using the Rate button above.
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This contribution was helpful to 2 thankful Users 0_Einstein majklkl

9/24/2012 9:45 AM	Rate (0)
majklkl Experienced Member Joined: 7/17/2012 Last visit: 9/26/2024 Posts: 41 Rating: (3)	Thanks, very useful information
	Last edited by: majklkl at: 9/24/2012 10:03 AM
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