9/22/2015 10:09 PM | |
Posts: 47 Rating: (3) |
Hello everyone, I have a problem with a S7-300 CPU, specifically an 6ES7 318-2A00-0AB0 equipped with a memory card MC951 EPROM of 64 Kb. Basically this is what happened: I have made some modifications on some blocks, loaded them using the 'Load' function and found out that these modifications have been lost after a power failure. I compared the blocks available online with the others in the saved project and I noticed that my modifications have been lost. My best guess is
that there is a problem with the buffer battery. Indeed, according to
what I understood from official Siemens documentation (https://support.industry.siemens.com/cs/attachments/7302326/7302326_Speicherkonzepte_bei_SIMATIC_S7-300_e.pdf),
the 'Load' function simply loads the program in the internal load
memory, that is actually a RAM (volatile) memory buffered through a
battery. In case this memory gets lost, the CPU will retrieve the program
from the memory card, that in my case contains out of date blocks,
since I have only loaded my modifications using the 'Load' function. Is this correct or have I lost something? Tomorrow
I will check the buffer battery with a tester to verify if it is the
source of the problem. In case it is, while waiting for a replacement, what
is the best solution? To save all the modified blocks on the memory card
using the 'Load user program to memory card' function? |
Last edited by: dan90 at: 9/22/2015 10:12:38 PMLast edited by: Min_Moderator at: 9/23/2015 2:00:06 PMEdit link to permanent one |
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9/23/2015 5:36 PM | |
Posts: 8946 Rating: (999) |
Do you try the "copy RAM to ROM" function? It may be necessary to Flash the eprom with the new software. |
9/24/2015 11:13 AM | |
Joined: 7/9/2015 Last visit: 8/30/2024 Posts: 3943 Rating: (585) |
Hi,
in FAQ you can read: The "Copy RAM to ROM..." function is not supported by S7-400 CPUs and the CPU S7-318 2DP. https://support.industry.siemens.com/cs/ww/en/view/15389520
Towome |
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