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Replacement of S7-400 CPU

Created by: ara12 at: 1/3/2019 7:16 PM (4 Replies)

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1/3/2019 7:16 PM	Rate (0)
ara12 Posts: 11 Rating: (0)	Dear Experts, We have Simatic S7-400 CPU 416-3PN/DP "416-3ES06-0AB0" which is now running in our plant and having a MMC "6ES7952-1AM00-0AA0". My question is, if in future CPU get faulty then we have to just put the MMC card to new CPU(have same part no as old 416-3ES06-0AB0) or we should have its software"Simatic Manager" backup to download in new CPU. Thanks and Regards, Arslan
ara12 Posts: 11 Rating: (0)
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1/4/2019 12:25 PM	Rate (0)
Person Experienced Member Joined: 2/25/2011 Last visit: 9/6/2024 Posts: 67 Rating: (5)	Dear Mr.Arsian, You will need Simatic Manager to download the program. If you remove the memory card the program will be erased. You have to keep the Program backup for future. Thanks.

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1/4/2019 2:05 PM	Rate (0)
ara12 Posts: 11 Rating: (0)	Dear Mr. Person, Thanks for the feedback, it means, if we remove the MMC from CPU s7-400, the program will be erased, right? so what will happen if we put that MMC to same CPU back, it is little confusing for me, please can u little more explain to me. Because till now my experience in S7-300 and my concept is if we put the programmed MMC to new CPU, the controller will take the program from the MMC and with out MMC we can not even use the CPU. is the concept of S7-300 is different from S7-400 plc, please can u clear my concept please. Thanks and Regards, Arslan
ara12 Posts: 11 Rating: (0)
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1/4/2019 9:15 PM	Rate (0)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 11/16/2024 Posts: 12294 Rating: (2691)	Hello Ara; The S7-300 MMC is a Flash memory card, as shown in the attachment below, so it stores the loaded program without battery support. When you remove and re-insert the MMC in the S7-300 CPU (when it is powered down) the program will be loaded to the CPU upon power up. The part number you show for the S7-400 memory card (MC) is a RAM card. It requires battery support (from the batteries inserted in the power supply module) to maintain the program. As soon as it is cut off from the battery support it loses everything that it contains, so when you start the CPU with an emptied RAM MC you have no program to run. You could also use a Flash EPROM MC, which does not require battery support, but demands the CPU be in Stop mode to download to it (using a specialized function "Load user program onto memory card"). In the following articles you will find descriptions of the memory concepts of the S7-300 and S7-400 families of CPUs. How can you obtain an overview of the memory concept of SIMATIC S7-300 CPUs and C7 devices? https://support.industry.siemens.com/cs/de/en/view/7302326 How can I get an overview of the S7-400 memory concept? https://support.industry.siemens.com/cs/de/en/view/7302549 Hope thius helps, Daniel Chartier Attachment S7-400 RAM memory card.jpg (353 Downloads)

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This contribution was helpful to 2 thankful Users Md Gouse Nam_lth

1/5/2019 7:53 AM	Rate (0)
ara12 Posts: 11 Rating: (0)	Dear dchartier, Thanks a lot for giving your kind support and information, now i get a right path about the memory concepts of siemens equipments. Thanks, Arslan
ara12 Posts: 11 Rating: (0)
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This contribution was helpful to 1 thankful Users Gilles - ACIS

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