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Saving Data on Memory Card?

Created by: Svetoslav Veselinov at: 6/1/2010 12:11 PM (4 Replies)

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6/1/2010 12:11 PM	Rate (0)
Svetoslav Veselinov Posts: 21 Rating: (4)	Hello, 1) I want to store data from a DB on the memory card. I use it as "program card", I read a lot of threads and could not quite understand is there any special procedure I have to do, or all the data is written on the MC automatically? 2) Is there a way to read the previously written data from MC on a PC or some other device? 3) Are there OBs like OB 88 or OB 121 as in S7300?? Thank you for your time.
Svetoslav Veselinov Posts: 21 Rating: (4)	Last edited by: Svetoslav Veselinov at: 6/1/2010 3:25 PM Last edited by: Svetoslav Veselinov at: 6/1/2010 1:14 PM
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6/1/2010 8:52 PM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 1/14/2025 Posts: 10239 Rating: (1182)	Hello Svetoslav Veselinov, 1. When you are using memory card as "program card" then you load program into it. Internal memory of CPU is erased. Then the fully program (contains all of the code blocks and data blocks, any technology objects, and the device configuration) is on memory card and from there is execute. If you remove this card from CPU, there hasn't program. I don't know what is you idea, but is possible to keep some (limited 2048bytes) variables into CPU' retentive memory. The retentive memory area is used to store the values of selected user memory locations during power loss. When a power down occurs, the CPU has enough hold-up time to retain the values of a limited number of specified locations. These retentive values are then restored upon power up. 2. SIMATIC memory cards have a Windows file system and comply with the necessary industrial requirements. The memory card can be written to and read in any PC and then also used again for operation in the CPUs. Note: SIMATIC memory cards are pre-formatted with a SIMATIC memory format that must be preserved. Do not use a PC to delete the two hidden files __log__ (system file) and crdinfo.bin (bin file). Do not use a PC to reformat the memory card or the card will become unusable. 3. Use SIMATIC S7 S7-1200 Programmable controller manual to understand how is possible to create different OB Hope this will helps. Best regards, Hristo Mihalev

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6/2/2010 10:34 AM	Rate (0)
Svetoslav Veselinov Posts: 21 Rating: (4)	Hello again, thank you for your answer, My idea is that I want to save data from a given process in a DB and I want to transfer it to the MC. I did not understand is there a function to execute like in S7300, or the data is saved directly on the MC when I check "retain". I want to save data from a period of about a month, and I want to access this data so to have something like process history that I can read when given this MC. I appreciate your help. Best regards. Svetoslav Veselinov
Svetoslav Veselinov Posts: 21 Rating: (4)
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6/2/2010 12:33 PM	Rate (1)
umencho Diamond Member Joined: 3/21/2006 Last visit: 1/14/2025 Posts: 10239 Rating: (1182)	Dear Svetoslav, Two ways. 1. If the memory card is using like "program" card, then every block (DB, FC...) is writing into the card. 2. In case of using retentive bytes in your case - A “Symbolic access only” DB can select individual data elements for retention. If “Symbolic access only” is not selected, then a block of DB data can be retentive. The 2048 byte total is shared between M and DB memory. The S7-1200 CPU automatically stores retained data in internal flash memory. Best regards, Hristo Mihalev

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6/2/2010 12:54 PM	Rate (0)
Svetoslav Veselinov Posts: 21 Rating: (4)	I'm very grateful, Hristo, thanks for your help.
Svetoslav Veselinov Posts: 21 Rating: (4)
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