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3 MEMORY CONFIGURATION OF THE CPU MODULE
3.4 Files
When the CPU module versions are different, a program which can be written to a CPU module with a certain
version may not be written to the one with another version due to overcapacity. In this case, delete the steps
reserved for online program change (default: 500 steps) and write the program to the CPU module.
GX Works3 Operating Manual
Configuration of a program file
The following figure shows the configuration of a program.
■Configuration of a program
This file consists of a file header, execution program, reserved area for online change, and program restoration information.
When the program is stored in the CPU module, file header, execution program, and reserved area for online change are
allocated to the program memory. Program restoration information is allocated to the data memory. The following table shows
the destination memory to which each area is allocated when a program is stored in the CPU module.
■FB file
This file consists of a file header, execution program, reserved area for online change, and program restoration information.
When an FB file is stored in the CPU module, the file header, execution program, and reserved area for online change are
allocated to the program memory. Program restoration information is allocated to the data memory. The destination memory
to which each area is allocated when an FB file is stored in the CPU module is the same as that for programs.
Area Destination memory Description
File header Program memory This area stores the configuration of the file, and the labels and information of FBs used in the
program. The size differs depending on the created program.
Execution program This area stores the execution program of the created program.
Reserved area for online change This area is used when the online program change which increases the number of steps is
executed (default: 500 steps (2000 bytes)). At writing to the programmable controller or at
online ladder block change, the capacity of the area can be changed from the engineering
tool.
Program restoration information Data memory This area stores information required for reading the program from the programmable
controller.
Program configuration
File header
Execution program
Reserved area for
online change
Program restoration
information
The size changes depending on the created
program.
The capacity can be set from an engineering
tool (Default: 500 steps).
FB file configuration
File header
Execution program
Reserved area for
online change
The size changes depending on the created
program.
The capacity can be set from an engineering
tool (Default: 500 steps).
Program restoration
information
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