Siemens SIMATIC S7-300 Module data Technical Data

Memory concept
4.2 Memory functions
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
4-11
4.2 Memory functions
4.2.1 General: Memory functions
Memory functions
Memory functions are used to generate, modify or delete entire user programs or specific
blocks. You can also ensure that your project data are retained by archiving these. If there
is... You created a new user program, use a PG/ PC to download the complete program to
MMC.
4.2.2 Loading user program from Micro Memory Card (MMC) to the CPU
User program download
All user program data are downloaded from your PG/PC to the CPU via MMC. The previous
content of the MMC is deleted in the process. Blocks use the load memory area as specified
under "Load memory requirements" in "General block properties".
The figure shows the load and work memory of the CPU
Loading memory Working memory
Stored on
hard disk
Code modules
Data modules
Comments
Symbols
Code modules
Data modules
Process-relevant
parts of the code
and data modules *
MMC
PG
CPU
* If not alI of the work memory area is retentive, its retentive area is indicated in the STEP 7
module status as retentive memory (same as on CPU 317). You cannot run the program
until all the blocks are downloaded.

Siemens SIMATIC S7-300 Module data Specifications

General

Series	S7-300
Manufacturer	Siemens
Protection Class	IP20
System	SIMATIC S7-300
Digital Inputs	Varies by module
Digital Outputs	Varies by module
Analog Inputs	Varies by module
Analog Outputs	Varies by module
Central Processing Unit	Varies by CPU model
Supply Voltage	24V DC or 120/230V AC
CPU Type	Varies (e.g., CPU 312, CPU 315, etc.)
Memory	Varies by CPU model
Communication Interfaces	MPI, PROFIBUS
Programming Languages	LAD, FBD, STL, SCL, GRAPH
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 70°C
Relative Humidity	10% to 95% (non-condensing)