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5 Understanding Programming
CJ2 CPU Unit Software User’s Manual
5-4 Function Blocks
5
5-5-5 Network Symbols (CJ2H-CPU6@-EIP
only)
The area of memory used for function blocks depends on the model of CJ2 CPU Unit that is used, as
described in the following table.
The CJ2M CPU Units have a special area called the FB Program Area to store function block defini-
tions. The CJ2H CPU Units do not have this area.
Select View
−
Memory View from CX-Programmer version 9.0 or higher.
The following Memory View Dialog Box will be displayed.
z When the PLC Model (“Device Type”) Is a CS/CJ-series PLC (Unit Version 3.0
or Later) Other Than the CJ2M
z When the PLC Model (“Device Type”) Is the CJ2M
Additional Information
Refer to the CX-Programmer Operation Manual (Cat. No. W446) for details on the Memory View
Dialog Box.
Memory Areas Used for Function Blocks
CPU Unit Models Memory areas used for function blocks
CJ2H CJ2H-CPU6@-EIP
CJ2H-CPU6@
User Program Area
CJ2M CJ2M-CPU3@
CJ2M-CPU1@
Creating instances of function blocks (i.e., calling function block defini-
tions and transferring parameters) uses user program memory.
Function block definitions use memory in the FB Program Area, a spe-
cial area for function blocks. If the capacity of the FB Program Area is
exceeded, the user program area is used.
Checking Function Block Memory Usage
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