Mitsubishi Electric MELIPC MI5000 Series User Manual page 101

Monitoring start and reset
This section shows the timing to start and reset monitoring a watchdog timer.
Function name
VxWorks part System watchdog timer
User watchdog timer
Reset interval of system watchdog timer
The system watchdog timer is reset by the system at fixed cycles. However, the reset time interval may be longer than the
prescribed cycle due to the execution of an interrupt program or other issue. The time taken for a reset
the buffer memory. ( Page 282 List of Buffer Memory)
*1 Time for the initial reset after the power supply of this product was turned ON, or time from a reset of the watchdog timer to the next
reset.
Operation during a timeout of the watchdog timer
This section shows the operating statuses during a timeout of the watchdog timer.
If the watchdog timer is timed-up, this provides a notification displaying an error (a watchdog timer error) to the effect that a
time in excess of that set in watchdog timer monitoring settings has elapsed.
The following table lists the LED display and operation statuses that change due to a timeout of the watchdog
timer. LED display and operation statuses other than those listed do not change due to a timeout.
Function name
VxWorks part System watchdog timer
User watchdog timer
*1 A registered routine can be executed when a timeout occurred. ( Page 100 Registration of routines)
Description
The system automatically starts monitoring, and resets using periodic processing. The system can
acquire the actual measured value of the time interval to reset the system watchdog timer. (
Page 99 Reset interval of system watchdog timer)
If system processing has been suspended for a long time because of a hardware failure of this
product or execution of an interrupt program, a watchdog timer timeout occurs. ( Page 99
Operation during a timeout of the watchdog timer)
Monitoring starts by executing the C Controller module dedicated function (CCPU_StartWDT), and
the monitoring time is reset by executing the C Controller module dedicated function
(CCPU_ResetWDT).
The watchdog timer times out when processing of a user application is not completed within the
specified time, and the C Controller module dedicated function (CCPU_ResetWDT) cannot be
executed. ( Page 99 Operation during a timeout of the watchdog timer)
Description
■Operating status
• Stop in communications using the CC-Link IE Field Network
• Notification of error (watchdog timer error)
■LED status
• VX RDY LED: Off
• MAIN ERR LED: On
*1
■Operating status
• Stop in communications using the CC-Link IE Field Network
• Notification of error (watchdog timer error)
■LED status
• MAIN ERR LED: flashing
8 DIAGNOSTIC AND MAINTENANCE FUNCTIONS
8.2 Watchdog Timer (WDT) Function
*1
can be checked by
8
99