11/3/2010 12:56 PM | |
Posts: 42 Rating: (1) |
Dear forum experts I want to get some information about the MCC itself and behavior of CPU while removing the MCC.any useful manual!! |
11/3/2010 1:32 PM | |
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365) |
Hello ROCLIM also check this post. regards |
Last edited by: hdhosseini at: 11/3/2010 1:33 PM |
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11/3/2010 2:01 PM | |
Joined: 8/31/2005 Last visit: 8/20/2024 Posts: 2198 Rating: (328)
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If the MMC is removed of a S7-300 CPU during RUN, the CPU goes to STOP. If the MMC is rentered there is no reaction. You must run a power circle (off, on) to restart the CPU. When the CPU restarts, it loads the data stored on the MMC (like you have downloaded the program again from ypur PG). You will loose actual values in DBs . "Ram to ROM" and "unlinked DBs" can "update" some data on theMMC, see here: http://support.automation.siemens.com/WW/view/en/7302326 http://support.automation.siemens.com/WW/view/en/15389520 |
Last edited by: miami at: 11/3/2010 2:06 PM |
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11/3/2010 4:04 PM | |
Joined: 9/27/2006 Last visit: 9/22/2024 Posts: 12282 Rating: (2685)
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Hello hdhosseiny; Just wanted to point out that the MMC is part of the S7-300 CPU hardware. S7-400 (and S7-400H) CPUs have a slightly different memory concept, and can use either RAM cards (64 kB to 64 MB in size) or 5V FLASH EPROM cards (also from 64 kB to 654MB). The S7-400 CPUs also have battery backup (which the S7-300 newer models do not anymore) so the questions becomes: What type of memory card should be used? Whether you use a RAM card or a flash card depends on how you intend to use the memory card. Table 2-11 Types of Memory Card If you…. Then… Want to store the data in RAMUse a RAM card and edit you program in RUN (Note: in this case,data retentivity is ensured by the battery backup) Want to store your user program permanentlyUse a Flash card On the memory card, even with power removed, (without backup or outside the CPU) (Note: in this case, program changes must be forced throught he Copy RAM to ROM command) Extracted from the S7-400 CPU specifications manual: Automation System S7-400 CPU Specifications Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 11/3/2010 4:05 PM |
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11/3/2010 5:33 PM | |
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365) |
Hi MMC is used in S7 300 terminology. As I checked the manual of fault tolerant system (here) section 5.7 the module called memory card as you can see the attachment. I tested this"while inserting memory card in S7 400H , CPU goes to stop". I will search on this topic to find the manual and more description on it. regards Attachmentmemory_card.pdf (181 Downloads) |
Last edited by: hdhosseini at: 11/3/2010 7:24 PM |
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This contribution was helpful to1 thankful Users |
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