Properties Of The Micro Memory Card (Mmc) - Siemens SIMATIC S7-300 Manual

Caution
All temporary variables (TEMP) of an OB and its nested blocks are stored in local data.
When using complex nesting levels for block processing, you may cause an overflow in the
local data area.
The CPUs will change to STOP mode if you exceed the permissible length of local data for a
priority class.
Make allowances for local data space required for synchronous error OBs. This is assigned
to the respective triggering priority class.
6.1.5

Properties of the Micro Memory Card (MMC)

Plug-in SIMATIC Micro Memory Cards
Memory modules available:
Table 6-4
Type
MMC 4M
MMC 8M
The MMC as memory module for the CPU
The memory module used on your CPU is a SIMATIC Micro Memory Card (MMC.) You can
use MMCs as load memory or as a portable storage medium.
Note
The CPU requires the MMC for operation.
Data stored on the MMC:
• User programs (all blocks)
• Recipes and archives
• Configuration data (STEP 7 projects)
• Data for operating system update and backup
Note
You can either store user and configuration data or the operating system on the MMC.
S7-300 CPU Data: CPU 315T-2 DP
Manual, 12/2005, A5E00427933-02
Plug-in MMCs
Order number
6ES7 953-8LM00-0AA0
6ES7 953-8LP10-0AA0
6.1 Memory areas and retentive address areas
Comments
-
Required for operating system update
Memory concept
6-7