2 Internal Memory in the CPU Unit
2-4
CP1E CPU Unit Software User’s Manual(W480)
Data that has been created using the CX-Programmer is transferred to the internal memory in the CPU
Unit as shown in the following diagram.
The CPU Unit will access the backup memory in the following process.
• The program or PLC Setup are transferred from the CX-Programmer.
• The program is changed during online editing.
• DM backup is operated by the Auxiliary Area.
During these processes, BKUP LED will light, indicating that the CX-Programmer is being backed up.
There are the following limitations during backup.
• The operation mode cannot be switched from PROGRAM mode to MONITOR/RUN mode.
• If the power is interrupted when the program or PLC Setup are being backed up, memory error may
occur the next time power is turned ON.
• If the power is interrupted when the DM area is being backed up, the reading of backed up DM area
will fail the next time power is turned ON.
2-1-3 Transferring Data from a Programming Device
2-1-4 Backup
User-created Programs
User programs
Symbol Table
Comments and
program index
Symbol Table
Comments and
program index
PLC Memory
CIO Area, Work Area, Holding
Area, Timer Area, Counter
Area, DM Area, and Auxiliary
Area
CPU Unit
User Program Area
User programs
I/O Memory Areas
PLC Setup
Parameter Area
PLC Setup
· The CX-Programmer can be
used to set status in each I/O
memory area and to write data
to the I/O memory areas.
CX-Programmer
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