Siemens S7-300 appendix Technical data of CPU 31x 7.1 General technical data

Technical data of CPU 31x 7.1 General technical data

7.1.2Technical data of the Micro Memory Card (MMC)

Plug-in SIMATIC Micro Memory Cards

The following memory modules are available:

Table 7-1 Available MMCs

Type	Order number	Required for a firmware update via MMC
MMC 64k	6ES7 953-8LFxx-0AA0	–
MMC 128k	6ES7 953-8LGxx-0AA0	–
MMC 512k	6ES7 953-8LJxx-0AA0	–
MMC 2M	6ES7 953-8LLxx-0AA0	Minimum requirement for CPUs without DP interface
MMC 4M	6ES7 953-8LMxx-0AA0	Minimum requirement for CPUs with DP interface
MMC 8M 1	6ES7 953-8LPxx-0AA0	–

1This MMC cannot be used together with CPU 312C or CPU 312.

Maximum number of loadable blocks in the MMC

The number of blocks that can be stored on the MMC depends on the capacity of the MMC being used. The maximum number of blocks that can be loaded is therefore limited by the capacity of your MMC (including blocks generated with the "CREATE DB" SFC):

Table 7-2	Maximum number of loadable blocks on the MMC
Size of MMC		Maximum number of blocks that can be loaded
64 KB		768
128 KB		1024
512 KB		Here the maximum number of blocks that can be loaded for the
2 MB		specific CPU is less than the number of blocks that can be stored on
		the MMC.
4 MB
		Refer to the corresponding specifications of a specific CPU to
8 MB
		determine the maximum number of blocks that can be loaded.

7-2	CPU 31xC and CPU 31x, Technical data
	Manual, Edition 08/2004, A5E00105475-05