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s7 400 load ram memory problem

Created by: eng_samp at: 1/7/2014 1:13 PM (28 Replies)

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1/9/2014 11:11 AM	Rate (0)
VVago Posts: 784 Rating: (52)	vipz Hai, If you use flash card, use download to memory card option. This is the only way to save program to FLASH. if you are not using this function,there is no meaning for inserting FLASH card because program will save inside internal ram of cpu. Also if power failure happens and battery is down, program will be taking from flash only. then your modified program will not be there (internal ram content will get erase). so am suggesting, for trials and all, use normal download. at the end of modification, download all blocks to flash . Hello, Kindly answer for the following questions: 1-If we make Reset for the CPU,The program will be taken from Flash card ? 2-If we make Upload ,The program will be taken from Flash card orfromRAM?
VVago Posts: 784 Rating: (52)
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1/9/2014 11:39 AM	Rate (0)
vipz Gold Member Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating: (30)	Hai, for 1st question, 1. if you doing MRES option with switch on cpu, program will not get erased, only values in db and marker will get reset-- normal behavior( even card is FLASH/RAM) 2. if battery is not present during this activity, all internal content will get deleted. if card is RAM kind, entire thing will get erase (ram card also will get erased), you need to load pgm again. if flash, program will be taking from FLASH card. second question-- i dont have hardware to test.( I think based on time stamping of Program blocks, cpu will be deciding which block need to be executed and same will be getting uploaded) will wait for experts..
	Last edited by: vipz at: 1/9/2014 6:13 PM Last edited by: vipz at: 1/9/2014 3:56 PM see marcjans post at the end With Best Regards VIPZ
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This contribution was helpful to 1 thankful Users VVago

1/9/2014 2:50 PM	Rate (3)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 5/3/2024 Posts: 5697 Rating: (715)	Hello, Lets take away some doubts by the result off a test i have done: 1 in case of Eprom and download to CPU only, program is stored in (load) Ram. 2 When downloaded to Eprom, Ram is cleared. 3 when changes are made and downloaded to cpu only changed blocks are stored in Ram. 4 when powercycle the CPU without battery, Ram is cleared and program is loaded from Eprom. 5 when changes are downloaded to Eprom Ram is cleared again. My conclusion is: your (load) ram is full because you did not download to memory card. In your Ram are only the changed blocks stored. If you download userprogram to card your Ram has again space to store and test your new functions. See attachment for the testing results. Regards, Marcjan Attachment S7_400_memorytest.pdf (796 Downloads)
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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This contribution was helpful to 8 thankful Users dchartier vipz VVago eng_samp Ajiajesh Delirium khbatman asamen7

1/9/2014 4:23 PM	Rate (0)
vipz Gold Member Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating: (30)	Hai Marcjan, thank you for detailed explanation. still some more points -- 1. Say, old FC1 in FLASH, modified FC1 on Internal RAM. then which ligic will be getting executed ? How PLC will be deciding this ? 2. while uploading which backup will get upload ? FC1 will get upload from Flash or Internal RAM ?
	With Best Regards VIPZ
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1/9/2014 5:07 PM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 5/3/2024 Posts: 5697 Rating: (715)	Hello, The CPU uses the new version and when you do an upload you upload the new version. How the CPU knows? Could be based on timestamp or more simple if it;s in Ram it must be new because if you download to Flash the Ram is cleared. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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1/10/2014 8:17 AM	Rate (0)
eng_samp Posts: 8 Rating: (0)	hello all from previous discussion , it seems to me that i have 2 option , option 1 to made download to flash card and cpu must be at stop mode evey time i made download , option 2 install ram card instead flash card ,and that mean i will made download to all blocks from pg is that right , what about option copy ram to rom ???????????? regards
eng_samp Posts: 8 Rating: (0)
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1/10/2014 8:39 AM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 5/3/2024 Posts: 5697 Rating: (715)	Hello, How many times are you changing the program? If you do that every day i recomend a Ram card, after programming is finished copy program to flash. If it's only a few times, keep the flash, when you download to flash you have 256k again to store your changes. Copy ram to rom is not supported by the 400 system. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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1/7/2015 8:31 PM	Rate (0)
Berg Silver Member Joined: 1/17/2006 Last visit: 8/18/2024 Posts: 553 Rating: (29)	Marcjan Hello, A flashcard will not solve the Ram memory problem, only a Ram card can extend the internal Ram. This card will automaticly be used if internal Ram is full. Regards, Marcjan Hi. I have a CPU 416-2 DP (6ES7 416-2XK04-0AB0) with a Flash Card 4Mbinstalled (6ES7 952-1KM00-0AA0) that is not been used for any block (I saw this in Online mode). The internal Load memory (RAM) is full and I want to expand with an external RAM card, changing the Flash card forone SRAM 4Mb card (6ES7 952-1AS00-0AA0). The issue is: Can I change the Flash card for the SRAM card without loss of data of the internal RAM?The new data that will be loaded in RAM will automatically located in external RAM ? What is the right procedure to do this change? best regards.
	"Educate the children and it won't be necessary to punish the men." Pythagoras
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1/7/2015 9:28 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365)	Berg The issue is: Can I change the Flash card for the SRAM card without loss of data of the internal RAM?The new data that will be loaded in RAM will automatically located in external RAM ? What is the right procedure to do this change? Hello, The procedure is explained in page #32 of the following manual.The point is, when you remove the external memory card, CPU requests a memory reset that delete the all RAMs in work and load memory.It means , you should re-load your program. Automation System S7-400 CPU Specifications Page #27, has more for consequences of memory reset. I hope this helps, Hamid Hosseini
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