Omron CP1L - 12-2007, Operation Manual

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CP1L CPU Unit Operation
Section 2-3
Never turn OFF the power supply to the CPU Unit when the BKUP indicator is
lit.
Memory Cassette
Memory Cassettes can be used as required in system operation and mainte-
nance. For example, they can be used to save programs, data memory con-
tents, PLC Setup data, or I/O comments from the CX-Programmer. The
contents of a Memory Cassette can also be automatically transferred if
desired.
Note Memory Cassettes cannot be used in CP1L-J CPU Unit.
2-3-2 Flash Memory Data Transfers
Built-in Flash Memory
Writing to Flash Memory
Data Transfer method
User program and
parameter data This data is automatically transferred from RAM to flash mem-
ory when a project is transferred from the CX-Programmer,
when the data is written to RAM from a PT or other external
device, or when the data is transferred from a Memory Cas-
sette.
DM Area data This data is transferred to flash memory only when the trans-
fer is specified from the CX-Programmer.
Comment memory
data This data is written to flash memory when a project is trans-
ferred from the CX-Programmer and transferring comment
memory is specified.
Function block
source data This data is written to flash memory when a project containing
one or more function blocks is transferred from the CX-Pro-
grammer.
RAM
Write operation from CX-Programmer
or automatic transfer from Memory
Cassette at startup.
Write
Write
User program
area
Parameter area
I/O memory area
DM Area
Battery
Backup
Write (comment memory specified)
Write
Automatic write
Automatic write
Write
Built-in flash memory
User program
area
Parameter area
DM Area initial
values
Comment memory
area
FB source memory
area
CPU Unit
FB = Function block
Write operation
to flash memory