Internal Allocation Of Variable Addresses - Omron CX-PROGRAMMER V8.1 Operation Manual

Variables
1-3-5

Internal Allocation of Variable Addresses

Setting Internal Allocation
Areas for Variables
When an instance is created from a function block definition, the CX-Program-
mer internally allocates addresses to the variables. Addresses are allocated
to all of the variables registered in the function block definition except for vari-
ables that have been assigned actual addresses with the AT Settings prop-
erty.
Program
Instance of function block definition A
a b
Input 0.00 Output 2.00
t
Output 5.00
Note: Variable c is an internal
variable, so it is not displayed.
Usage: Inputs
Properties:
Name Type AT Initial Value Retained
a BOOL
Usage: Outputs
Properties:
Name Type AT
Initial Value Retained
b
YES
BOOL
t
TIMER
Usage: Internals
Properties:
Name Type Initial Value
AT Retained
c 2000.00
BOOL
The user sets the function block instance areas in which addresses are allo-
cated internally by the system. The variables are allocated automatically by
the system to the appropriate instance area set by the user.
Setting Procedure
Select Function Block/SFC Memory - Function Block/SFC Memory Allo-
cation from the PLC Menu. Set the areas in the Function Block/SFC Memory
Allocation Dialog Box.
FB instance areas
Non-retained area
15
Starting address
CIO, H, W,
D, or E Area
Retained area
15
Starting address
H, D, or E
Area
Timer area
Starting address
T Area
Counter area
Starting
Automatic allocation of C Area
address
addresses by system
Example
2000.00
Manual allocation of address to
variable in FB by AT Settings option.
Section 1-3
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Size (words)
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Size (words)
Size (Completion
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Size (Completion
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