6/1/2017 9:48 AM | |
Joined: 7/9/2015 Last visit: 8/30/2024 Posts: 3943 Rating: (585) |
HI, please check the following FAQs. They will explain behaviour of memory / mmc in a S7-300 PLC How do you save the setpoint values (actual values) of the SIMATIC S7-300 which are changed online during commissioning?Please check PDF Dokumentation and the links of Further Information Regards, Towome |
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6/1/2017 9:55 AM | |
Joined: 3/5/2014 Last visit: 8/5/2022 Posts: 5521 Rating: (1054) |
hi hieutran8969, have a look at this FAQ: How can you obtain an overview of the memory concept of SIMATIC S7-300 CPUs and C7 devices? hope this helps, regards, |
FCK WAR! |
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6/1/2017 9:32 PM | |
Joined: 12/9/2010 Last visit: 10/8/2022 Posts: 623 Rating: (77) |
Hi hieutran8969, If ur io modules are same, then inserting again MMC1 will result in smooth running of machine. [This practice is generally referred as backup MMC where new MMC with program is inserted in case of corrupted or faulty MMC] But if modules are added, then there will be bus fault and SF fault on modules but still machine will run. However note that setpoints should be saved in retentive DBs. [This is done by copying online DBs to offline program.] |
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6/2/2017 2:35 PM | |
Joined: 12/9/2010 Last visit: 10/8/2022 Posts: 623 Rating: (77) |
Hi hieutran8969, 1. do i need download any to PLC or MMC1 will backup all data, program from MMC to memory of PLC when PLC restart? --> No nned to download. 2. i see the action "copy Ram to Rom" to save data from PLC to MMC? do i need to do that step to save all data to MMC? --> Not for S7-300 and must for S7-400 with flash RAM card. |
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