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S7-300 CPU 31x -- Product information -- Background and system information
What are the differences between OPEN MODBUS / TCP Redundant V1 and OPEN MODBUS / TCP Redundant V2?
What is the difference between "normal routing" and data record routing?
Which SIMATIC S7-300/S7-400 modules support the NTP time-of-day message and how do you activate this kind of time synchronization?
Which manufacturer ID, in other words OUI (Organizationally Unique Identifier), does SIEMENS AG use for the MAC addresses of network-compatible devices?
What should you watch out for when using the alarm numbering procedure?
Which IO controllers and IO devices support the following functions: IRT, prioritized startup, MRP, PROFIenergy, Shared device, I device and clock-synchronized mode?
What is the maximum number of parameters that can be assigned to an FC and FB in the S7-300 CPU?
Which types of connection/protocols do the S7-300/400 CPUs and the CPs support by default?
Which PROFINET nodes support automatic commissioning (device replacement without interchangeable medium) in the case of topological configuration and device replacement without topological configuration?
Which PROFINET nodes support the extended PN diagnostics and what do you have to configure?
Why is only a warm start available for S7-300?
Which SIMATIC S7 modules support the "Direct Data Exchange" function (internode communication)?
Which entries deal with consistent data in conjunction with distributed I/O?
What properties, advantages and special features does the S7 Basis Communication offer?
What properties, advantages and special features does the global data communication offer?
What is the connection between subnet masks and IP addresses with regard to subnetting and supernetting (Classless Inter Domain Routing CIDR)?
Which modules support the S7 routing function?
How can you obtain an overview of the memory concept of SIMATIC S7-300 CPUs and C7 devices?
Retentivity behavior of S7-300 CPU 31x and complete devices C7-6xx with MMC
Status of the run-time meter after overall reset
Why does the retentivity behavior of the S7-300 CPUs and C7 devices without MMC (Micro Memory Card) influence the contents of the variables?
Local data addressing with S7-300 / S7 400
S7 300 run-time meter doesn't give any value
C7 6xx -- Product information -- Background and system information
Which external storage media can you use with the SIMATIC panels and which memory card interfaces do they have?
The C7 6xx complete devices are to be discontinued in October 2010 – what are their successors?
How do you display ALARM_S or ALARM_D messages with process values (so-called associated values) on a WinCC flexible operator panel?
Which connector cables are available for connecting to SIMATIC Panels?
How many connection resources can be managed by the C7-CPU or the C7-OP?
Which GSD file do you need for a C7 Complete Device?
Which software do you need for the C7-621 module (with integrated AS interface master)?
How can you obtain an overview of the memory concept of SIMATIC S7-300 CPUs and C7 devices?
Why does the retentivity behavior of the S7-300 CPUs and C7 devices without MMC (Micro Memory Card) influence the contents of the variables?
Retentivity behavior of S7-300 CPU 31x and complete devices C7-6xx with MMC
Overview of components integrated in a C7 complete system
How can you obtain an overview of the memory concept of SIMATIC S7-300 CPUs and C7 devices?
Part number:

Description:
The attached document contains a description of the various memory concepts. To give you a better overview, the various memory concepts in the document are described in separate tables. The last chapter of the document includes a list of the various SIMATIC S7-300 controllers and C7 devices and their associated memory concepts.

The document is divided into the following chapters:

  1. Overview of the Memory Areas and Memory Concept
    1.1 Memory Areas
          1.2 Memory Concept
          1.2.1 Load Memory
          1.2.2 Main Memory
          1.2.3 System Memory
    1.3 Determining the Memory Parameters of a CPU
     
  2. SIMATIC S7-300 CPUs and C7 Devices Without Bay
    2.1 Graphic Display of the Memory Concept
    2.2 Load Memory
    2.3 Main Memory
    2.4 Application of the Buffer Battery
     
  3. SIMATIC S7-300 CPUs and C7 Devices With MC Bay
    3.1 Graphic Display of the Memory Concept
    3.2 Load Memory
    3.3 Main Memory
    3.4 Application of the Buffer Battery
     
  4. SIMATIC S7-300 CPUs and C7 Devices With MMC Bay
    4.1 Graphic Display of the Memory Concept
    4.2 Load Memory
    4.3 Main Memory
    4.4 Application of the Buffer Battery
     
  5. Memory Concepts of SIMATIC S7-300 CPU Types and C7 Device Types in Detail

    5.1 Memory Concepts of SIMATIC S7-300 CPU Types
    5.2 Memory Concepts of C7 Device Types

  Attachment 01: Speicherkonzepte_bei_SIMATIC_S7-300_e.pdf ( 396 KB )  

Important:
The memory concept for the SIMATIC CPU 318-2DP is similar to that for the SIMATIC S7-400 CPUs (see Entry ID:7302549).

 

Information on SIMATIC S7-300 CPUs with/without memory card (MC) is available in the following entries.

  • Data of the individual CPUs is available in the manual "SIMATIC PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP ", section 1.4 in Entry ID: 8860591
  • Notes on the various types of memory card and their properties are available in "SIMATIC PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP", section 1.1 in Entry ID: 8860591

Information on SIMATIC S7-300 CPUs with micro memory card (MMC) is available in the following entries.

  • Data of the individual CPUs is available in the manual "CPU 31xC and CPU 31x: Specifications", chapters 6 and 7 in Entry ID: 12996906
  • Notes on the various types of micro memory card and their properties are available in "S7-300 CPU 31xC and CPU 31x, Specifications", sections 4.1, 6.1 and 7.1 in Entry ID: 12996906
  • Notes on overall reset of the CPU can be found in the manual "S7-300 CPU 31xC and CPU 31x, Specifications", section 4.2, in Entry ID: 12996906

Information independent of the type of memory card (MC or MMC)

  • Notes on the topic of "How can you back up your program from the load memory?" are available in Entry ID: 299133
  • Notes on the topic of "What is the effect of the STEP 7 function "Copy RAM to ROM"?" are available in Entry ID: 15389520

Keywords:
CPU selection, Memory cards

 Entry ID:7302326   Date:2009-01-08 
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