2-3
2 Internal Memory in the CPU Unit
CP2E CPU Unit Software User’s Manual(W614)
2-1 Internal Memory in the CPU Unit
2
2-1-2 Memory Areas and Stored Data
The built-in Flash Memory is the backup memory for user program, parameters, program source, com-
ment and Data Memory backed up using control bits in the Auxiliary Area.
Data is retained even if the power supply is interrupted.
The following table lists the CPU Unit memory areas and the data stored in each area.
Built-in Flash Memory
2-1-2 Memory Areas and Stored Data
Memory area and
stored data
Details
Built-in
RAM
Built-in
non-vola-
tile RAM
Built-in
Flash
Memory
User Program Area
The User Program Area stores the object code for executing
the user program that was created using the CX-Programmer.
Stored Not stored Stored
FB Program Area The FB Program Area stores the function block that was cre-
ated using the CX-Programmer.
Stored Not stored Stored
Parameter Area Stored Not stored Stored
PLC Setup Various initial settings are made in the PLC Setup using soft-
ware switches.
Refer to Section 7 PLC Setup.
Routing Table
Routing tables are network parameters for FINS communica-
tions. They are specified using the CX-Integrator.
Refer to the CX-Integrator Operation Manual (Cat. No. W464)
IP Router Table
IP router table is used to store the IP address of the relay IP
router when the device communicates through the IP router.
IP Address Table
Definition table of the relationship between FINS node
address and IP address.
Source and Comment Areas Not stored Not stored Stored
Program Source The source code of the program (ladder language, in
task/function block)
Symbol Table The symbol table contains symbols created using the CX-Pro-
grammer (symbol names, addresses, and I/O comments).
Comments Comments are created using the CX-Programmer and include
annotations and row comments.
Program Index The program index provides information on program sections
created using the CX-Programmer, as well as program com-
ments.
I/O Memory Areas The I/O Memory Areas are used for reading and writing from
the user programs.It is partitioned into the following regions
according to purpose.
• Regions where data is cleared when the power supply to
the CPU Unit is reset, and regions where data is automati-
cally retained without battery even if the power supply is
turned OFF.
• Regions where data are exchanged with other Units, and
regions that are used internally.
Not stored Stored Not stored
DM Area words backed up to backup memory (built-in Flash
Memory) using control bits in the Auxiliary Area.
Not stored Stored Stored
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