10/23/2017 7:09 AM | |
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365)
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Dear user,
6ES7 952-1AH00-0AA0 is a RAM and you need back up batteries to retain the content.If you want to keep the user program in a RAM, you should check your batteries, CPU or rack to see if proper back up supply is applied to CPU to keep data live.Test again with new batteries , turn off PS and check the data retentive. If you lose it again, replace CPU or check pins on rack. There is no option to download the user program to external RAM,the management is done by CPU itself.List of all available external flash memories is available in section 10.11 HERE.To copy data to flash memory in S7-400,read more HERE. I hope it helps, hdhosseini |
This contribution was helpful to1 thankful Users |
10/24/2017 10:40 AM | |
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365)
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Hello again,
When there is no power and no battery, program execution is not possible.When the content of RAMs are lost in a CPU, all previous diagnostic buffer data are lost, date and time of CPU is reset to an initial value (not current date) and user program is lost. These are options that should be checked by a PG. The other point to consider, I encountered similar cases for H CPUs, but by replacing the components I found out the problem is the CPU itself.In that case, due to using UPS for supply and an external Flash memory the decision was made to use the old CPU despite the problem.There is another option to try, check page 22 and 23 of THIS manual.There is another option to provide back up supply to CPU directly.Check if it is possible to use in your case. I hope it helps, hdhosseini |
10/24/2017 6:16 PM | |
Joined: 2/22/2017 Last visit: 7/11/2024 Posts: 24 Rating: (0) |
Dear hdhosseini, Thanks for your helps, i need to try this Regards, huynhhai77 |
10/30/2017 2:31 PM | |
Joined: 2/22/2017 Last visit: 7/11/2024 Posts: 24 Rating: (0) |
give more image |