10/31/2007 8:38 AM | |
Posts: 264 Rating: (59) |
I think the mmc was a good idea as load memory for the cpu´s. There´s no backup batterie needed any longer! That reason sufficed´s me that the memory concept of the new CPU´s is better then earlier. If you argument that somebody could sabotage and remove the mmc from a cpu, then you didn´t design the sufficient topology conditions (e.g closeable control cabinet´s) You are also able (also with the old cpu´s) to stop the cpu by turning the switch in stop mode. And when you insert a eeprom into a old cpu, the cpu also asks for reset and keeps in stop mode. I was also a little bit sceptic when i heard of the necessary of mmc´s, but now i think it is a technical good solution. See also the attachement and this FAQ: http://support.automation.siemens.com/WW/view/en/7302326 best regards... AttachmentSpeicherkonzept S7300.zip (233 Downloads) |
4/28/2017 4:07 PM | |
Posts: 2 Rating: (0) |
The solution was, format the MMC, download the program but why jou lost the program?
|
4/28/2017 4:31 PM | |
Joined: 9/27/2006 Last visit: 9/22/2024 Posts: 12282 Rating: (2685)
|
Hello ever; Your problem description is not quite clear to me. In principle, a MMC acts as load memory without battery backup for a s7-300 CPU. It should not lose the program under normal circumstances. However, you mention formatting the MMC. What hardware/software combination did you use? A MMC must never be formatted using windows card readers and software. Only a PG (progrmming computer) from Siemens will format the MMC so that it can be used with a S7-300 program. I know various sites offer Simatic images for different size MMCs from Siemens, but the comments do not show much success. How do you format or reset an MMC (Micro Memory Card) for SIMATIC S7-300 CPUs? Please give us more information on your response to your problem. I would think that is you managed to load your program to the MMC after formatting this must have been done with a Siemens PG. Is that correct? And how long was the CPU unpowered before you discovered the program had been lost? Hope this helps, Daniel Chartier |
Follow us on