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1.2 Program Storage and Operation
1
OVERVIEW
(b) Program execution
The CPU module operates the program stored in the program memory.
(c) Execution of program stored in standard ROM/memory card
Programs and data can also be stored into the standard ROM/memory card.
The programs stored in the standard ROM/memory card can be booted (read) to
the program memory and executed when the PLC is powered ON or the CPU
module is reset.
Note2
By storing programs and data into the standard ROM/memory card, they can be
saved without battery backup.
1) Basic model QCPU
To execute boot from the standard ROM to the program memory, it is
necessary to make boot file setting in the PLC Parameter dialog box of GX
Developer.(
Figure 1.12 Execution of stored program
Note2
Figure 1.13 Boot run of Basic model QCPU
Program memory
Parameter
Program
Device initial value
Device comments
Execution of program
in program memory
For program comment display
by GX Developer
Basic
Note1.2
Since the Basic model QCPU cannot use a memory card, it cannot store programs in the
memory card.
Basic
Program
memory
Boot
Standard
ROM
Execution of program booted from the
standard ROM to the program memory.
Parameter
Program
Device
initial value
Device
comments