Restarting User Cpu - Mitsubishi Electric MELSEC Q Series User Manual

6.4

Restarting User CPU

User CPU restarting is an operation to apply the changes made in the user program while the system is running.
You may restart the user CPU by operating U RST/P1/P2 switches.
In addition, user CPU restarting is also possible from Setting/monitoring tools for the C Controller module or user
program.
● In any of the following conditions, do not restart the user CPU.
• Accessing to the SD memory card
• Accessing to the USB device
• Accessing to the standard ROM or user files in the standard RAM
● Before restarting the user CPUs, check that:
• the CPU operation status is STOP;
• the user program stop and close operations are performed;
• file operations are not in process;
• the U RDY LED is not flashing (user CPUs preparing for operations).
(1) Components influenced by user CPU restarting
User CPU restarting will apply any change in the user program.
For components influenced by restarting, refer to the following figure.
Network module
Link
device
*1 : Input (X), output (Y), internal user device and CPU shared memory values will be retained.
*2 : Link refreshing with the network module and refreshing with the CPU shared memory will be continued.
● To apply any change in parameter settings, reset the system. User CPU restarting does not apply parameter setting
changes.
● To clear input (X), output (Y), internal user device and CPU shared memory values, reset the entire system or clear the
respective device(s).
● For initial processing for the entire system by the user program, execute the initial processing again after user CPU
restarting, or reset the entire system.
Another CPU
System CPU
Output (Y)
CPU
shared
memory
CPU shared
Refresh
Internal user device
Link refresh
Unaffected portions*1,*2
CHAPTER 6 HARDWARE OPERATIONS
Q24DHC-V Q24DHC-VG
C controller module
User CPU
Input (X)
User program
memory
Reboot
Affected portions
Q12DC-V
Q24DHC-LS Q26DHC-LS
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