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S7-300 Memory Cards -- Product information -- Technical data

	Which devices can you use to read from, write to or delete from an S7-300 MMC (Micro Memory Card) outside the CPU?
	How do you format or reset an MMC (Micro Memory Card) for SIMATIC S7-300 CPUs?
	Why does the SFC 54 "RD_DPARM" not work with the new S7-300 CPU with MMC?
	How do you create a label for the Micro Memory Card (MMC)?
	How can you read out the identification data (the serial number of the MMC, for example) with the SFC 51 in STEP 7 V5.5?
	What points do you need to remember during the handling of micro memory cards?
	Why can't I see the values which are transmitted to an unlinked destination DB with SFC84, even though SFC84 is not indicating an error (RET_VAL = W#16#000?
	Which memory cards can you use with a S7-300 CPU?
	What is the effect of the STEP 7 function "Copy RAM to ROM"?
	How do you delete the data on an MMC (micro memory card)?
	How can you also store other files that belong to the project or plant on the MC/MMC?
	How do you copy the user program from the load memory into the main memory without PG with a S7-300 CPU with MC slot?
	How does the CPU 31x/31xC/C7 react when an MMC fault occurs during the save procedure?

S7-300 CPU 31x -- Product information -- Technical data

	How can you control the ALM (Active Line Module) of a CU320 (with DriveCLIQ) with the SIMATIC program?
	Where can you find an update to use the SINAMICS with newer firmware in S7 Technology V4.1?
	Which modules can you use when implementing software redundancy?
	Which organization blocks do you have to load into the CPU to ensure that the CPU does not go into the "STOP" status when a remote I/O fails?
	How do you find out further technical information about your module?
	Why can't I see the values which are transmitted to an unlinked destination DB with SFC84, even though SFC84 is not indicating an error (RET_VAL = W#16#000?
	How does the CPU 31x/31xC/C7 react when an MMC fault occurs during the save procedure?
	What is the effect of the STEP 7 function "Copy RAM to ROM"?
	Why does the SFC 54 "RD_DPARM" not work with the new S7-300 CPU with MMC?
	How do you copy the user program from the load memory into the main memory without PG with a S7-300 CPU with MC slot?
	How can you backup your program from the load memory?
	Which communication services supported by the CPUs with integrated PROFINET interface and by the WinAC RTX via Industrial Ethernet?
	Implementation of SIMATIC modules of the product families S7-300, S7-400, ET 200M, ET 200S ET, 200iSP and TDC in environments with high concentrations of corrosive gas
	At which ambient temperature and at which air pressure can you operate a SIMATIC S7-300?
	What can you do when the power requirement of the modules in the subrack exceeds the power supply provided by the CPU on the backplane bus?
	Where do you find certificates and approvals for SIMATIC S7 in the Internet?
	Where can you find images, graphics, symbols and screenshots for SIMATIC industrial automation systems?
	Which SIMATIC S7 components and which drives support clock-synchronicity functionality?

How does the CPU 31x/31xC/C7 react when an MMC fault occurs during the save procedure?

Part number:

Description
The service life of an MMC depends mainly on the number of delete and programming procedures.
The memory blocks of the MMC memory permit at least 100,000 write/delete operations. This refers to the operations with STEP 7 and data block backups upon power OFF and with SFC 84. In particular, therefore, SFC 84 should only be called at corresponding time intervals (e.g. hourly, daily ...).

If there is an MMC defect during saving, then the relevant application (e.g. load block, SFC) issues a negative acknowledgment or RET_VAL. This indicates that the routine has not been executed.
A resources or memory error is then recorded in the diagnostics buffer of the CPU.

The MMCs are also used with the C7 complete devices C7-613/635/636.

Note
More information on this topic is available in the device manual "CPU 31xC and CPU 31x, Technical Data", in the chapter entitled "Properties of the SIMATIC Micro Memory Card". The manual is available in Entry ID: 12996906 .

Entry ID:19142352

Date:2010-10-22

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