File System - Structure And Features - Siemens S7-300 Configuration Manual

File management and file access with FTP/FTPS
9.2 Advanced CP as FTP server for the file system on the CP
9.2.2

File system - structure and features

Structure of the file system on the Advanced CP as shipped
With access using an FTP tool, the file system of the Advanced CP appears as follows:
Figure 9-1
Memory areas and configuration limits
On the current Advanced CPs, the file system is divided into 2 areas:
● Flash area (nonvolatile memory):
The flash area allows data to be stored and retained if there is a power down.
Since the number of times it is possible to write to this area is restricted, you should avoid
repetitive write operations to this area. Ideally you should use the RAM area for such
requirements.
● RAM area (volatile memory):
In contrast to the flash area, the RAM can be written to and read from any number of
times. The data in the RAM is retained as long as the Advanced CP is supplied with
power.
The RAM is intended to store data that changes during operation and needs to be
recorded (data recording services). The RAM is also suitable for temporary storage.
The RAM area is located in the file system below the "/ram" folder. All files and folders
below this folder are lost when there is a power down.
Available storage space
The Web diagnostics of your Advanced CP (start page/file system) and the device manual
for your Advanced CP /1/ (Page 227) contain information about the total memory area
available in the entire file system, the memory space still available in the flash area and in
the RAM area of the file system as well as other operational data.
148
The file system on the Advanced CP
Configuring and commissioning S7 CPs for Industrial Ethernet
Configuration Manual, 09/2013, C79000-G8976-C182-13