![[Pasted image 20231013152726.png]]


https://support.industry.siemens.com/cs/document/97553417/how-do-you-estimate-the-memory-requirements-of-your-project-in-the-load-memory-of-a-simatic-s7-1200-s7-1500-?dti=0&lc=en-LY


The memory of a Siemens S7-1500 PLC is divided into different areas:

1. **Load Memory (LM)**: This is where the user program and the system data are stored permanently.
2. **Work Memory (WM)**: This is used for temporary data storage and is divided into:
    - **Program Memory**: For storing the executable version of the user program.
    - **System Memory**: For storing system data temporarily.
    - **Data Memory**: For storing data blocks, data areas, and instance data.
3. **Retentive Memory**: This memory area retains its data even after a power failure, and is used for data that needs to be preserved.

![[Pasted image 20231013154721.png]]

| Característica                      | Siemens S7-1515                                         | Siemens S7-1513                                        |
|-------------------------------------|----------------------------------------------------------|--------------------------------------------------------|
| **Display**                         | Sí                                                      | Sí                                                    |
| **Memoria de trabajo para código**  | 500 KB                                                  | 300 KB                                                 |
| **Memoria de trabajo para datos**   | 3 MB                                                    | 1.5 MB                                                 |
| **Tiempo de operación de bit**      | 30 ns                                                   | 40 ns                                                  |