Mitsubishi Electric Q12DCCPU-V User Manual page 269

9
PROGRAMMING USING BUS INTERFACE
FUNCTIONS
(8) When the operation status is changed from RUN to STOP/PAUSE
When the operation status of the C Controller module is changed from RUN to STOP/
PAUSE, the user program task does not stop.
Use the QBF_Read StatusEx function when splitting the user program processing
according to the operation status of the C Controller module.
(9) When a user watchdog timer cannot be reset
A user watchdog timer error occurs when the user watchdog timer cannot be reset
due to some reasons such as user program runaway.
When a user watchdog timer has occurred, perform the following.
After the above operations, reset the C Controller system.
For resetting, refer to the C Controller Module User's Manual (Hardware Design,
Function Explanation).
(10)Relation between system tasks and the system watchdog timer, user
watchdog timer, and link device refresh cycles
When using any of the following functions, set a sufficiently long time for each of the
system watchdog timer, user watchdog timer, and link device refresh cycles.
If any of the above is used, CPU utilization for a system task with high priority may
increase and a system watchdog timer error, a user watchdog timer error, and link
refresh timeout may occur more frequently.
For the link refresh timeout, the rate of occurrence may also increase when bus
interface driver processing (connections with peripheral devices or communication
with an intelligent function module, etc.) is used.
(11)IP address setting
The IP address of the C Controller module cannot be set from the user program.
Set it in the <<Online operation>> tab of C Controller setting utility.
• Increase the WDT time set by the QBF_StartWDT function.
• Lower the CPU utilization of tasks that require high utilization.
Or set them not to operate.
• Review the user program.
• Shell command
• Workbench/Tornado connection
• File access
• Mount/unmount of CompactFlash card
• Ethernet communications
• NFS server communication
9.6 Precautions for Functions
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