Omron SYSMAC CP Series, User Manual

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4 Understanding Programming
CP2E CPU Unit Software User’s Manual(W614)
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Addresses are allocated to symbols using one of the following methods.
• User Specified allocation
• Automatic allocation using the CX-Programmer
The area of memory used for automatic allocations is set by selecting
Memory Allocation - Auto-
matic Address Allocation
from the PLC Menu in the CX-Programmer.
Note “Global” and “local” indicate only the applicable scope of the symbol.
They have nothing to do with the applicable scope of memory addresses.
Therefore, a warning but not an error will occur in the following cases, and it will be possible to
transfer the user program.
• The same addresses is used for two different local symbols.
• The same addresses is used for a global symbol and a local symbol.
Additional Information
In programs in the CX-Programmer, global symbols and local symbols can be identified by the
following character colors and symbol icons.
Select Tool s - Option s , and select Local Symbol s or Global Symbol s in Appearance to change
the color.
Types of
symbols Project tree in the
CX-Programmer
Scope
Address and
I/O comment
(without a
symbol name)
Access using
symbols
from a net-
work
Access from
other tasks
Access from
the local task
Global
symbols PLC tree Not
possible. Possible. Possible. Supported
Local
symbols Program tree Not
possible. Possible. Not supported
Classification Display color Example (default color)
Global symbols Black (default)
Local symbols Blue (default)
Start
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Error
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