5/3/2019 9:37 AM | |
Posts: 1 Rating:
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I have S7 400 cpu 416 and 412 I want fixed memory card on both CPU, one cpu Ram is there. I can replace RAM card to memory card? Other CPU is blank so i want fix memory card. Please suggest. ...sent from App ------------------------------------------------------------------------------------------ |
Last edited by: Jen_Moderator at: 05/03/2019 11:38:30New subject after splitting |
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5/3/2019 2:10 PM | |
Joined: 9/27/2006 Last visit: 8/14/2024 Posts: 12277 Rating:
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Hello chiku; You can use a Flash memory card (FEPROM) in a S7-400 to serve as Load Memory support, as you can see in the following document: A RAM card needs battery support to maintain the program in memory, a Flash card does not. But the number of times a FEPROM can be written to is limited (compared to a RAM card). How can I get an overview of the S7-400 memory concept? https://support.industry.siemens.com/cs/ww/en/view/7302549 Note that there are restrictions when using a FEPROM with Step 7, compared to using a RAM card: - the PLC must be in STOP mode for a download to the FEPROM (with a RAM card you can download while the CPU is in RUN); - you cannot simply use the Download icon to write the write to the FEPROM; you must use the Menu function PLC --> "Load program to memory card".to do so. When developing and commissioning a S7-400 project, since we were expecting many corrections and downloads, we would prefer using a RAM card until the project was ready to be transfered to the client. At that point we would replace the RAM card to a FEPROM. stop the CPU and download the completed program. That way the project could be maintained without battery power support. Here is a list of available memory cards (both RAM and Flash) that you can use in a S7-400 CPU: Which memory cards can you use with a S7-400 CPU? https://support.industry.siemens.com/cs/us/en/view/73159687 Hope this helps, Daniel Chartier |
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