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CHAPTER5 MEMORIES AND FILES USED FOR CPU MODULE
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5.1 Memories Used for CPU Module
5.1.8 Operating the program in the memory card (boot operation)
(4) Operation for stopping boot operation
To stop boot operation and operate the CPU module by the parameters and program files written to the program
memory, perform the following operations.
1) Remove the memory card and write parameters without boot file setting to the program memory by
GX Developer.
2) Power on the programmable controller again or reset the CPU module.
(5) Boot operation precautions
(a) Storage location of parameters
• Store the parameters set in the Boot file tab of the PLC parameter dialog box to the memory card.
If the parameters set in the Boot file tab are stored in the program memory or standard ROM, the CPU
module ignores the parameter settings. ( Section 5.1.10)
• When both of the following status 1) and 2) occurs, the CPU module is not operated by the parameters in
the memory card, but by the parameters in the program memory.
1) There are parameters in the program memory.
2) The parameters in the memory card are not set in the Boot file tab.
(b) Online change in boot operation
1) Memory card (RAM)
When data are written to a program in the program memory in the RUN status ( Section 6.12), the
change can be updated to the program in the boot source memory card (RAM).
2) Memory card (ROM)
Even if a program in the program memory is written in the RUN status, the change is not updated to the
program in the boot source memory card (ROM).
Therefore, write the same file whose program was written to the program memory to the memory card (ROM)
by Write to PLC (Flash ROM). ( Section 5.1.7)
(c) Maximum number of settable boot files
Set the maximum number of settable boot files in the Boot file tab of the PLC parameter dialog box so that it
may be the same with the number of files storable to the program memory.
However, the number of boot files reduces by 1 when:
• a heading is set, or
• the parameters set in the Boot file tab of the PLC parameter dialog box and stored in the memory card is
booted.