Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 426

(4) Setting of whether to use a local device (for each program)
Use of the local device can be set for each program, and this function can reduce the scan
Also, since the area for saving and restoring data is not required for the programs not using a local device, the
local device file size can be reduced.
(a) Setting method
In addition to the setting in (3) in this section, set the following.
Select the File Usability Setting button in the Program tab of the PLC parameter dialog box, and specify the
programs that use the local device.
Click the
Note 6.3
Universal
When setting local devices for each program with the Q02UCPU, Q03UDCPU, Q04UDHCPU, Q06UDHCPU,
Q13UDHCPU, or Q26UDHCPU, check the versions of the CPU module and programming tool used. (
Appendix 2)
424
Program execution
Program A Save/Restore
Program B
Program C
Scan time decreases because saving
/restoring process is not performed.
button.
Local device file (.QDL)
For program A
For program C
File size can be reduced since the saving or
restoring area for program B is not created.
Note 6.3
time.Note 6.3
Page 465,