Siemens SIMATIC S7-300 CPU Data: CPU 315-T-2 DP User Manual

Memory concept
6.1 Memory areas and retentive address areas
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 Plug-in MMCs
Type Order number Comments
MMC 4M 6ES7 953-8LM00-0AA0 -
MMC 8M 6ES7 953-8LP10-0AA0 Required for operating system update
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
6-7

Siemens SIMATIC S7-300 CPU Data: CPU 315-T-2 DP Specifications

General

Programming Language	STEP 7
Power Supply	24 V DC
Number of DP masters	1
Processable Technology objects	Yes
Number of counters	256
Number of timers	256
S7 communication	Yes
Number of connections for S7 communication, max.	16
PG/OP communication	Yes
Global data communication	Yes
Integrated DP interface	Yes
Integrated PROFINET interface	No
SIMATIC Computing Platform	No
Operating Temperature	0 to 60 °C
Integrated Interfaces	MPI, DP
Communication	PROFIBUS DP
Cycle Time	0.1 ms
Engineering with	STEP 7
Backup available	Yes
Transmission rate, max.	12 Mbit/s