A
A-3 Inner Workings of CP1L
106 SYSMAC CP1L Getting Started Guide
Appendix
(4) User program
• The ladder program is stored in this memory (RAM) area. The ladder program
can be saved, edited, or opened from CX-Programmer.
(5) I/O memory
• This is the memory (RAM) area the user program writes to and reads from.
Some parts of the I/O memory are cleared when the power is interrupted.
Other parts are maintained. There are also parts, which are used for data
exchange with PLC units, and other parts, which are only used internally.
• There are 2 ways to exchange data with other units: once each execution
cycles, or only when instructed.
(6) Parameter areas
• In addition to I/O memory area, which is used as instruction operands by the
user, there is also a separate memory area that can be manipulated only from
CX-Programmer. This is the “parameter area”. The parameter area stores PLC
setup data.
[PLC Setup]
PLC setup is the configuration data used by the user to provide a software
definition of the basic specifications of the CPU unit. These consist of
parameters such as serial port settings and minimum cycle time settings.
For details on configuring PLC setup, refer to CX-Programmer Operation
Manual (W446).
(7) Built-in flash memory
• CP1L CPU units have built-in flash memory.
Data is automatically backed up to the built-in flash memory as they are
written to the user program area or the parameter area (PLC setup, routing
table) by methods other than programmed instructions, i.e. when transferred
or edited using CX-Programmer or PT, or when transferred from the memory
cassette.
• The next time the unit is powered ON, user memory (user program or
parameter area) will automatically be transferred back from the built-in flash
memory to RAM.
• By using CX-Programmer, data in the DM area of the I/O memory can also be
saved to the built-in flash memory. This saved data can be set as defaults for
the DM area, and can be automatically written back into the DM area when the
unit is powered ON next.
• Symbol table, comment file, and program index file can be stored in the
comment memory portion of the flash memory. When a project is transferred
from CX-Programmer to the CPU unit, program information for the function
block will automatically be saved to the flash memory.
(8) Memory cassette
• Memory cassettes can store programs, data memory contents, PLC setup
data, and I/O comments from CX-Programmer.
• Data stored in the memory cassette can be loaded automatically when the unit
is powered ON.
W07E-EN-02+CP1L+GettingStartedGuide.book Seite 106 Montag, 15. September 2008 11:15 11
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