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5.2 Program File Structure

MEMORIES AND FILES HANDLED BY CPU MODULE

5.2 Program File Structure

A program file consists of a file header, execution program and allocate memory for online

change.

(1) Structure details

The capacity of the program stored in the program memory of the CPU module is the

total of the above three areas.

(a) File header

This area stores the file name, size, creation date, etc.

The file header size ranges from 26 to 35 steps (104 to 140 bytes) depending on

the device setting of the PLC parameter dialog box.

(Default: 34 steps)

(b) Execution program

This area stores the created program.

This area is used when online change that increases the number of steps is

performed by GX Developer.

When such an online change is performed by GX Developer, the number of

remaining allocate memory for online change is displayed.

1) Default number of allocate memory for online change

The default setting is 500 steps (2000 bytes).

2) Changing the number of allocate memory for online change

The number of allocate memory for online change can be changed by GX

Developer (by choosing [Online] [Write to PLC] <Program>‚ tab).

When the number of steps is insufficient for online change, it can be set again.

( Section 6.14.1)

Diagram 5.9 Program file structure

Program file structure

File header

Execution program

34 steps

500 steps

(dafult)

Allocate memory

for online program

change

Area is secured in file size units.

( )

Section 5.3.4

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