PCADAPTERUSB (6ES7972-0CB20-0XA0) is used between PC and plc. The CPU is 315-2DP. When the MMC card is not inserted, the connection can be established. However, when the hardware is downloaded, the SDB is too large. But once you insert the MMC card, it will become unconnected immediately. The reset was done using the reset button on the CPU, but the problem could not be solved.
A: Try to download again using the following method
1, can use the compression function:
Put the CPU in STOP state, at this time:
You can execute the menu PLC/DiagnosticSetting/ModuleInformation, open the module information window, select the “Memory†option, you can see the current working memory of the CPU and the current usage of the load memory, loading Whether the memory (LoadMemoryRAM) has enough space to store the new fast, you can click the "Compress" button to free up more storage space.
2. Delete the block on the MMC card in the CPU as follows:
Insert the MMC card to be deleted into the CPU.
In the SIMATIC Manager, switch to online mode via "View>Online" or via the relevant button.
, select the block folder in the online window.
, mark all the blocks in the folder.
Right-click and select "Delete" (you can confirm that the prompt system function cannot delete the information).
3. If you wish to delete the MMC with password protection, follow the steps below.
Insert the MMC card into the PG or the SIMATIC USB card reader of the personal computer.
Select "File" in the SIMATIC Manager.
Select "S7MemoryCard" ==> "Delete..."
SDB is too big mistake. That is, the system data is too large. The first thing to do is to understand all the data inside the PLC. Clearing the data is like using a new plc. Then re-download the program and hardware configuration of the project to the PLC.
Can't connect to the MMC card?
This MMC card is not new, there are other data inside, so inserting the PLC will produce this situation! Because there are other programs and hardware configurations in the MMC card.
What you have to do is to clear the MMC card and then insert the mmc. Put your hardware configuration and save the whole project, and generate the SDB data without error. Download the hardware configuration to your plc first, then put The program is downloaded to the PLC.
Clear method of MMC card:
(1) For the new S7-300 (with MMC card), the method is as follows: establish the connection between the computer and the CPU. In the SIMATIC Manager, select the menu View/Online and open the Blocks online. Select the block, right click and select "Delete" to delete the contents of the CPU working memory, and also delete the contents of the MMC card; you can also use the menu PLC/Downloaduserprogramtomemorycard (download the user program to the memory card), download An empty program to the MMC card, indirectly delete the program in the MMC card; you can also use the PG or Siemens dedicated card reader to delete the program in the MMC card.
(2) For the standard S7-300 (using the flash FEPROM card), first in the SIMATIC Manager, select the menu View / Online, open the Blocks online, select the block, right click and select "Delete" ", you can delete the contents of the CPU work memory, and then execute the menu PLC / CopyRAMtoROM (copy RAM to ROM), that is, download the online program to the FEPROM card, delete the program in the FEPROM card.
Pharmaceuticals,2-Methyl- Propanoic Acid Monohydrate Price,2-Methyl- Propanoic Acid Monohydrate Free Sample,Pure 2-Methyl- Propanoic Acid Monohydrate
Zhejiang Wild Wind Pharmaceutical Co., Ltd. , https://www.wild-windchem.com