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2 Internal Memory in the CPU Unit
2-2
CP2E CPU Unit Software User’s Manual(W614)
2-1 Internal Memory in the CPU Unit
The internal memory in the CPU Unit consists of built-in RAM, built-in non-volatile RAM and built-in
Flash Memory. The built-in RAM and built-in non-volatile RAM are used as execution memory and the
built-in Flash Memory is used as backup memory.
The built-in RAM is the execution memory for the CPU Unit.
The user program and parameters are stored in the built-in RAM.
Data is unstable when the power supply is interrupted.
The built-in non-volatile RAM is the execution memory for the CPU Unit. It is used to retain the data
when the power supply is interrupted.
I/O memory is stored in the built-in non-volatile RAM.
Data Memory Area (D), Holding Area (H) and Counter Area (C) are retained even if the power supply is
interrupted with no battery installed.
2-1-1 CPU Unit Memory Backup Structure
Built-in RAM
Build-in Non-volatile RAM
B u ilt-in Fl as h Memory
(Ret a ined when the power
su pply i s interr u pted)
U s er Progr a m Are a
FB Progr a m Are a
(B a ck u p)
P a r a meter
PLC S et u p
Ro u ting T ab le
IP Ro u ter T ab le
IP Addre ss T ab le
(B a ck u p)
S o u rce a nd Comment Are as
U s er Progr a m Are a
FB Progr a m Are a
P a r a meter
Exec u tion Memory
B u ilt-in RAM
(Not ret a ined when the power
su pply i s interr u pted)
B u ilt-in Non-vol a tile RAM
(Ret a ined when the power
su pply i s interr u pted)
I/O Memory Are as
CPU Unit
DM Are a
(B a ck u p)
DM Are a
B a ck u p Memory
Exec u tion Memory
A u tom a tic ba ck u p
Re s tore a t s t a rt u p
A u tom a tic ba ck u p
Re s tore a t s t a rt u p
B a ck u p us ing b it in A u xili a ry Are a
DM Are a d a t a re s tore a t s t a rt u p