Controller Memory Organization

Introduction

The controller memory is composed of two types of physical memory:

The non-volatile memory contains files (application, configuration files, and so on).
The Random Access Memory (RAM) is used for application execution.

Files Transfers in Memory

Item	Controller State	File Transfer Events	Connection	Description
1	–	Initiated automatically at Power ON and Reboot	Internal	Files transfer from non-volatile memory to RAM. The content of the RAM is overwritten.
2	All states except INVALID_OS ⁽¹⁾	Initiated by user	Ethernet or USB programming port	Files can be transferred via: Web server FTP server Controller Assistant EcoStruxure Machine Expert
3	All states	Initiated automatically by script (data transfer) or by power cycle (cloning) when an SD card is inserted	SD card	Up/download with SD card ⁽¹⁾.
(1) If the controller is in the INVALID_OS state, the only accessible memory is the SD card and only for firmware upgrades.

NOTE: The modification of files in non-volatile memory does not affect a running application. Any changes to files in non-volatile memory are taken into account at the next reboot.