Eaton XC-303 Series - Page 25

1 Description of the Modular PLCs XControl: XC-104-…, XC-204-…, XC-303-…
1.6 Functionality
20 Modular PLCs XControl: XC-104-…, XC-204-…, XC-303-… 01/23 MN050005EN Eaton.com
• Inside
•
"\home" system memory
• external (optional)
• MicroSD memory card
“\home\disk_sd“
• USB device “\home\disk_usb“.
The boot application and the operating system are stored in compressed for-
mat and protected against power supply failures in the transactionally safe
system memory.
In the operating state, the boot application and the relevant sections of oper-
ating system are “unpacked” and copied into the working memory. Mean-
while, the retentive data is stored in the non-volatile NVRAM memory.
On all XControl modular PLCs, only the real-time clock (RTC) is backed up
with a capacitor. This backup makes it possible for the clock to keep working
for 10 days when the device is de-energized.
Figure 8 indicates the interaction of the differing XC300 memory systems/
drives.
Figure 8: XC300 memory organization
Drives
XC300 XC200 XC100
Inside
System memory “/\home“ “/home“ “/home“
external (optional)
MicroSD memory card “/\home/\disk_sd“
„/home/codesys/work“
1)
“/home/disk_sd“
„/home/codesys/work“
“/home/disk_sd“
„/home/codesys/work“
USB device
“/\home/\disk_usb“
„/home/codesys/work“
1)
“/home/disk_usb“
„/home/codesys/work“
“/home/disk_usb“
„/home/codesys/work“
1) On XC300 with XSOFT-CODESYS-3 Version 3.5.17 or higher
￫
Transaction safe means that if there is a voltage dip when
the file is being processed, the file system and the opened
file are generally not destroyed. It is possible however,
that data which you have written into the file last opened
may be lost.
\home
\disk_sd
\disk_usb
Program
memory
(flash)
Working
memory
(SDRAM)
microSD memory card
USB device