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doubt in memory concept with 315 2 dp

6/18/2008 1:02 PM	Rate (0)
simaticmanager Posts: 150 Rating: (5)	dear friends, i m using a cpu 315-2 dp with MMC 128 KB. There already a user programm in the cpu , now i have to add some more blocks as a modification. But when i try to download it shows memory bottleneck. after compressing also it is not possible to add block. Pls suggest if i use 512 KB mmc then could i be able to add blocks or i have to change the cpu. As i am doubt full that cpu 315 - 2dp supports max 128 kb. thnks in advance vivek
simaticmanager Posts: 150 Rating: (5)
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6/18/2008 1:43 PM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 1/16/2026 Posts: 9105 Rating: (1204)	Hello simaticmanager, When you go to Block folder in your project and then Object properties (right mousebutton) Go to tab Blocks, here you find an indication how much blocks will occupy in Work memory (128 Kbyte) You cannot expand workmemory. Then you should use another CPU Best regards, Wizard
	Last edited by: Wizard at: 6/18/2008 1:50 PM Remember: You should use a MMC (load memory) which is larger than workmemory. So perhaps a new MMC (512 kb) may help. Because when you have a MMC (128 Kbyte) you cannot use complete workmemory of CPU (128 Kbyte), because you need more in Load memory than in Workmemory.
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6/18/2008 2:19 PM	Rate (0)
simaticmanager Posts: 150 Rating: (5)	dear wizard, thanks for response. But as i guess the user programm resides in the MMC card and cpu calls the respected blocks in its work memory then why i cant solve my prob by expanding the MMC capacity. If the capacity of work memory decide the max length of user programm then i think there will not be any use of using MMC greater then 128 for the case. can u pls clear my doubts in detaills. thnks vivek
simaticmanager Posts: 150 Rating: (5)
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6/18/2008 2:55 PM	Rate (1)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 1/16/2026 Posts: 9105 Rating: (1204)	Dear simaticmanager, Ok, I will try When you look at your Step 7 project and you select 'Blocks' (directory), right mouseclick and select Object properties. Go to TAB 'Blocks'. Here you see Size in Load memory (MMC) and Size in Work memory (CPU) The size needed in Load memory is larger than size in Work memory. So when you want to make complete use of Work memory, you should have a MMC (load memory) which is larger. You download your programm to MMC (load memory) that what's relevant for working programm is copied to Work memory when start up of CPU. I hope it helps. So when you have a MMC 128 Kbyte you can not use complete workmemory of CPU (128 Kbyte). When you use MMC 512 KByte you can use complete work memory. Best regards, Wizard

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6/18/2008 3:14 PM	Rate (0)
simaticmanager Posts: 150 Rating: (5)	thnks, it cleared my doubt
simaticmanager Posts: 150 Rating: (5)
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6/18/2008 3:30 PM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 1/16/2026 Posts: 9105 Rating: (1204)	You are welcome Best regards, Wizard

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