Omron SYSMAC CS1D-PD Series Operation Manual page 105

CPU Units
Note
Memory Card, etc.). The user program and the Parameter Area data will thus
not be lost even if battery voltage drops.
CPU Unit
Flash Memory
User program
Written
automatically
Written
automatically
Parameter Area
Comment memory
area
FB program
memory area
Automatically backed up to flash memory whenever
a write operation for the user program or parameter
area is performed from a Programming Device.
1. The Parameter Area stores system information for the CPU Unit, such as
the PLC Setup.
2. Part of the EM (Extended Data Memory) Area can be converted to file
memory to handle data files and program files in RAM memory format,
which has the same format as Memory Cards. File memory in the EM Area
is backed up by a battery.
Built-in RAM
I/O Memory Area
Backup
The battery life is 5 years at an
Drive 1: EM file ambient temperature of 25⊕ C.
memory (See note 2.)
User program
Drive 0: Memory
Card
(flash memory)
Parameter Area
(See note 1.)
File memory
Used to store symbol table files,
comment files, and program
index files. CS1D CPU Units with unit
version 4.0 or later, Memory
Card, EM file memory, or comment
memory can be selected as
the destination when transferring
projects from CX-Programmer.
When transferring projects containing
function blocks from the
CX-Programmer for CPU Units with unit
version 4.0 or later,
the function block program information
is automatically stored
in the FB program memory area.
Section 2-4
Battery
65