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| 9/13/2012 1:00 PM | |
Joined: 9/27/2006 Last visit: 11/16/2024 Posts: 12294 Rating:
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Hello Sudheendra; The load memory of the S7-400 can be expanded either by a RAM of EEPROM module (there is a basic integratedload memory of about 256 kB in the S7-400 CPUs). The basic difference between using different types of memory modules for load memory is that with a RAM card you save the program by a "normal" download to the PLC from your program, but this memory needs to be sustained by a battery in the power supply module. Whereas when you want to write to an EEPROM you must use a specific command "copy RAM to ROM", and the CPU has to be in STOP mode; but theEEPROM memoryis self-sustaining, no need for a battery. How can I get an overview of the S7-400 memory concept? So in large applications we would use a RAM card to develop/test/commission the program in the S7-400 (many changes in the program, many downloads), and when we handed it over to the client (no more changes to the progrqam, or very little)we would stop the PLC, remove power, exchange the RAM card of an EEPROM and wrote the final program to the EEPROM for long-term storage. Hope this helps, Daniel Chartier |
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| 9/13/2012 1:43 PM | |
Joined: 2/20/2012 Last visit: 5/11/2023 Posts: 62 Rating:
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Thank you for your time Dechartier. This is clear to me now from your post. -Sudheendra
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| 9/15/2012 4:49 AM | |
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Joined: 2/20/2012 Last visit: 5/11/2023 Posts: 62 Rating:
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Thanks for teh info gre_m |
| 3/15/2016 6:40 AM | |
Joined: 10/10/2014 Last visit: 11/7/2024 Posts: 6 Rating:
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please check |
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