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CHAPTER5 MEMORIES AND FILES USED FOR CPU MODULE
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5.1 Memories Used for Basic Model QCPU
5.1.5 Operating and writing programs in the standard ROM (boot operation)
(c) Writing to the standard ROM
The following describes the operations before writing and the methods for writing.
1) Before writing
Writing a file to the standard ROM automatically deletes all files stored in the standard ROM.
Therefore, store the stored files again by “Read from PLC” before the writing.
( Section 5.1.3)
2) Writing procedure
To write a file to the program memory, select [Online] [Write to PLC] in GX Developer.
To write the file written to the program memory to the standard ROM, select [Online] [Write to PLC (Flash
ROM)] [Write the program memory to ROM].
(d) Program execution
Resetting the CPU module starts boot operation from the standard ROM.
Whether the boot operation is normally completed or not can be checked by the special relay (SM660).
For details of the special relay (SM660), refer to the following.
QCPU User's Manual (Hardware Design, Maintenance and Inspection)
(2) Adding or changing a file in the standard ROM
Add or change the file by the following method (stored files cannot be added or changed directly).
1) To read all files in the standard ROM, select [Online] [Read from PLC].
2) Add or change the read files.
3) Write the added or changed files to the program memory.
4) Select [Online] [Write to PLC (Flash ROM)] [Write the program memory to ROM] and write the files to
the standard ROM.
Figure 5.11 Copy program memory data into ROM screen
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