5
MEMORIES AND FILES HANDLED BY CPU MODULE
5.1 Memories by CPU Module
5.1.4 Standard ROM program execution (boot run) and writing
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1
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2
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3) Write to standard ROM by GX Developer
• Choose [Online] [Write to PLC] on GX Developer and write the files to
the program memory.
• Choose [Online] [Write to PLC (Flash ROM)] [Write the program
memory to ROM...] on GX Developer, and write to the standard ROM the
files written to the program memory. (
4) Program execution
When you carry out the following operations, the system boots from the
standard ROM.
• Restarting the PLC power
• Reset end with the CPU module RUN/STOP/RESET switches.
• Remote reset using GX Developer.
5) Check for normal boot completion
Whether the boot is normally completed or not can be checked by the special
relay (SM660) status.
Refer to Appendix 1 for the special relay.
(b) Operation to stop boot run
Perform the following operation using GX Developer to stop boot run and execute
operation by the parameter program written to the program memory.
1) Remove the checkmark from "Boot from standard ROM" in the PLC parameter
boot file settings.
2) Write parameters and sequence program data to the program memory.
3) Choose [Online] [Write to PLC (Flash ROM)] [Write the program memory
to ROM...].
(c) Precautions for standard ROM program execution
1) Files stored into standard ROM
Before executing boot run, store the following files into the standard ROM.
• Parameter
*1
• Program
*1
• Device comment
* 1 : Must be stored into the standard ROM.
2) Online change during boot run
If online change is made to a program in the program memory during boot run
from the standard ROM, the change is not updated on the program in the boot
source standard ROM.
Hence, write the program to the standard ROM (
(3) in this section) when
the CPU module is put in a STOP status.
3) When program memory contents change at power OFF ON or reset
When you write the PLC program into program memory and switch the PLC
power OFF ON or end the CPU module reset, if the contents of the program
memory change, it is possible that boot operations are being used.
Refer to "(2)(b) Operation to stop boot run" in this section, and stop the boot
run.
Содержание MELSEC QS Series
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