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(3) Operation for stopping boot operation
To stop boot operation and operate parameters and programs written to the program memory, perform the
following operations.
1) Format the program memory.
2) Select [Online] [Write to PLC (Flash ROM)] [Write the program memory to ROM] in GX Developer
(programs and parameters in the standard ROM are deleted).
3) Write programs and parameters to the program memory.
(4) Precautions
(a) Files stored to the standard ROM
Before boot operation, store the following files to the standard ROM.
• Parameter
• Intelligent function module parameter
• Program
*1
• Device comment
• Initial device value
*1: Any of the sequence program, ST program, and SFC program is required.
(b) Online change in boot operation
When a program in the program memory is written in the RUN status during boot operation from the standard
ROM, the change cannot be updated to the program in the boot source standard ROM.
Set the CPU module to STOP and then write the program to the standard ROM.
(c) When data in the program memory are changed after the CPU module is powered off
and then on or is reset
If the program memory data are changed after the sequence program is written to the program memory and the
CPU module is powered off and then on or is reset, a boot operation may be active. Refer to (3) in this section
and stop the boot operation.
(d) Setting the communication time check period in GX Developer
If less than 180 seconds is set to "Check at communication time" in the Host station Detailed setting screen
when a file is written to the standard ROM, set it to 180 seconds.
If an error occurs, extend the communication time check period by the setting in the Transfer Setup screen.
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