1/5/2012 1:07 AM | |
Posts: 3609 Rating: (29) |
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7/31/2018 7:45 PM | |
Posts: 2 Rating: (0) |
hi is there a solution to keep the memory in s7 400 series cpu even the power is removed |
7/31/2018 9:50 PM | |
Joined: 9/27/2006 Last visit: 9/22/2024 Posts: 12282 Rating: (2685)
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Hello Diji; If you use a RAM memory card in your S7-400 as load memory (or if you have a no memory card in the S7-400 CPU, you are using internal RAM memory to store your program) you need battery power support to maintain the program when power is removed. You have 2 battery slots in your power supply module for that purpose. If the power supply is removed for a long time then your batteries may become depleted and the program will be lost. If you use a Flash-EPROM card in the S7-400, as load memory, then you do not require battery support and the program will remain stored in the flash memory almost indefinitely. But you are required to STOP the CPU every time you want to write the program to the memory card, and you must use the function PLC >Load user program onto memory card. You will find a good explanation of the memory concept in the following FAQ: How can you get an overview of the S7-400 memory concept https://support.industry.siemens.com/cs/ww/en/view/7302549 You will find a listing of the available memory cards for the S7-400 (RAM and flash) in the following link: https://support.industry.siemens.com/cs/ww/en/view/73159687 Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 7/31/2018 9:54:29 PM |
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