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CPU Units Section 3-1
Note The language displayed for the CJ-series CPU Units is not set on the DIP
switch, but rather is set using Programming Console keys.
3-1-3 CPU Unit Memory Block Map
The memory of CJ-series CPU Units is configured in the following blocks.
• I/O Memory: The data areas accessible from the user program
• User Memory: The user program and parameter areas (See Note 1.)
CPU Unit memory is backed up as shown in the following table.
Areas Backed Up by Battery
If the battery voltage is low, the data in these areas will be lost. The CPM2A-
BAT01 Battery is used for CJ1 and CJ1-H CPU Units and the CJ1W-BAT01
Battery is used for CJ1M CPU Units.
Areas Backed Up by Flash Memory
The data in these areas will not be lost even if the battery voltage is low. The
CJ1-H and CJ1M CPU Units have an internal flash memory to which the user
program and parameter area data are backed up whenever the user memory
is written to, including data transfers and online editing from a Programming
Device (CX-Programmer or Programming Console), data transfers from a
Memory Card, etc. The user program and the parameter area data will thus
not be lost when using a CJ1-H or CJ1M CPU Unit.
The internal flash memory of CJ1-H and CJ1M CPU Units with unit version
3.0 also contains a comment memory and FB program memory area. The
comment memory is used to store symbol table files, comment files, and pro-
gram index files (if comment memory is selected as the transfer destination
when transferring projects from a CX-Programmer Ver. 5.0). The FB program
memory area is used to store function block program data.
CONTROLLER
CJ1G-CPU44
SYSMAC
PROGRAMMABLE
ERR/ALM
RUN
COMM
INH
PRPHL
OPEN
BUSY
MCPWR
ON
Area CJ1 CPU Units CJ1-H CPU Units CJ1M CPU Units
User memory Battery Flash memory Flash memory
I/O memory Battery Battery Battery
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