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IM 151-8 CPU Load Memory Error

Created by: S7Mgr at: 5/21/2010 6:01 AM (7 Replies)

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5/21/2010 6:01 AM	Rate (0)
S7Mgr Advanced Member Joined: 1/22/2008 Last visit: 2/10/2022 Posts: 77 Rating: (0)	Hello, I have attached herewith a error report which I got while downloading my complete program to CPU IM 151-8, what should I do in this case. How should I completely erase program and again redownload it. Thank in Advance Attachment mem_err.pdf (101 Downloads)

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5/21/2010 4:36 PM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 11/27/2023 Posts: 8596 Rating: (1139)	Hi S7Mgr, You can erase the MMC, going online and delete blocks. Advise would be to use a bigger MMC. The MMC must be greater then the size of Work memory. Best regards, Wizard

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6/2/2010 8:01 AM	Rate (0)
S7Mgr Advanced Member Joined: 1/22/2008 Last visit: 2/10/2022 Posts: 77 Rating: (0)	Hello Wizard, Thanks for your reply, I am using CPU IM 151-8 with 128 K memory. The memory card I am using is 64K. What happens in case you have load memory less than work memory, any other problems arising out of it. Regards, S7Mgr

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6/2/2010 10:56 AM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 11/27/2023 Posts: 8596 Rating: (1139)	S7Mgr ......I am using CPU IM 151-8 with 128 K memory. The memory card I am using is 64K. What happens in case you have load memory less than work memory, any other problems arising out of it. Hello S7Mgr, When the Load memory (MMC) is less than work memory, you can not use the complete work memory of your CPU. Because a project uses always more Load memory then Work memory. Go to Blocks in project and with right mouse click go to Object properties. Second tab will show the amount of Work memory and Load memory needed for this project. When you want to use the complete Work memory of CPU, you need a bigger MMC. Hope this will help. Best regards, Wizard

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6/2/2010 12:22 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 11/29/2023 Posts: 12178 Rating: (2635)	Hello guys; The optimal ratio of load memory to work memory is 150%. That is for downloading andrunning a program, of course. If you want to save files (complete projects, CAD drawings,,,)on the MMC, then of course you should use a very large load memory moidule, 4 or even 8 MB. These are the rules you still have to use when you work with a S7-400, the Flash (or RAM)memory modules have to be selected properly. Hope this helps, Daniel Chartier

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6/3/2010 6:17 AM	Rate (0)
S7Mgr Advanced Member Joined: 1/22/2008 Last visit: 2/10/2022 Posts: 77 Rating: (0)	Thanks Guys, For your valuable info and suggestions. As highlighted above I am attaching herewith a screenshot of the memory area classification of my project. I am using IM 151-8 CPU with 128 K work memory and 64 K MMC. What would happen if I use 128 K MMC...? Will that do in my case..? [schnippschnapp] Please suggest, Regards, New question is transferred to what happens if my work memory is up to neck. Attachment 1.pdf (82 Downloads)
	Last edited by: O_Moderator at: 6/4/2010 8:57 AM Last edited by: S7Mgr at: 6/3/2010 6:33 AM
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6/3/2010 9:18 AM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 11/27/2023 Posts: 8596 Rating: (1139)	S7Mgr .....I am using IM 151-8 CPU with 128 K work memory and 64 K MMC. What would happen if I use 128 K MMC...? Will that do in my case..? Hi, This project needs 48 Kbyte loadmemory (MMC), so the 64 K MMC would be enough. But like you mentioned in the beginning, when you want to download the complete project, there could be a problem of not enough load memory. Because at that moment the Load memory occupies the new blocks and also the old blocks. When you use 128 K MMC, you will have less problems. , but as mentioned before, you will not be able to use the complete 128 Kbyte of workmemory. Best regards, Wizard
	Last edited by: O_Moderator at: 6/4/2010 8:57 AM
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6/3/2010 11:26 AM	Rate (0)
S7Mgr Advanced Member Joined: 1/22/2008 Last visit: 2/10/2022 Posts: 77 Rating: (0)	Thanks guys for your concern. It was really very helpful. Regards, S7Mgr

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