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CPU Units Section 3-1
Note 1. The Parameter Area stores system information for the CPU Unit, such as
the PLC Setup. An attempt to access the Parameter Area by an instruction
will generate an illegal access error.
CJ1 CPU Unit
Built-in RAM
Parameter Area
(See Note 1.)
I/O Memory Area
Drive 1: EM file
memory (See Note 2.)
Battery
Backup
Drive 0: Memory
Card
(flash memory)
File memory
User program
The battery life is 5
years at an ambient
temperature of 25°C.
CJ1-H or CJ1M CPU Unit
Built-in RAM
I/O Memory Area
Battery
Backup
Drive 0: Memory
Card
(flash memory)
File memory
User program
User program
Parameter Area
Flash memory
(CJ1-H and CJ1M
CPU Units only)
Auto
write
The battery life is 5 years at an
ambient temperature of 25°C.
Auto
write
Parameter Area
(See note 1.)
Drive 1: EM file
memory (See note 2.)
Comment memory area
FB program memory area
Automatically backed up to flash memory whenever a write
operation for the user memory area (user program or parameter
area) is performed from a Programming Device.
Used to store symbol table files, comment files, and program
index files. CPU Units with unit version 3.0 or later, Memory
Card, EM file memory, or comment memory can be selected as
the destination when transferring projects from CX-Programmer
Ver. 5.0.
For CPU Units with unit version 3.0 or later, when transferring
projects containing function blocks from the CX-Programmer,
the function block program information is automatically stored
in the FB program memory area.
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