Driver Wdt Function - Mitsubishi Electric MELSEC SW1DNC-CCIEF-B User Manual

5.9

Driver WDT function

The driver WDT function monitors the operation of the software (operating system, driver) using the timer function on CC-Link
IE Field Network board.
When the driver cannot reset the timer of the board within the specified driver WDT monitoring time, CC-Link IE Field Network
board detects driver WDT error. Driver WDT function detects driver operation delay due to the access error from the driver to
CC-Link IE Field Network board or system high load.
Driver WDT settings
For the setting methods, refer to the following section.
Page 106 Driver setting
The driver WDT function is set to invalid as a default.
When the driver WDT error has occurred
The following shows the operation when driver WDT error has occurred.
• CC-Link IE Field Network board and the driver stop communication and are disconnected from the network in order to
avoid an erroneous output. When the Driver WDT function confirmed the CC-Link IE Field Network board in which a driver
WDT error is occurred from other station, a CPU stop error occurs.
• RUN LED flicks and RD. LED turns ON on the CC-Link IE Field Network board.
• "-28158 (9202H) Driver WDT error" occurs when accessing CC-Link IE Field Network board from the application program
in which the CC IE Field Utility and MELSEC data link library function are used.
When the multiple application programs in which MELSEC data link library is used are executed, driver WDT
error is returned to all the programs. However, only the CC-Link IE Field Network board in which the driver
WDT error has occurred is recognized as an error station on the network. When using driver WDT function,
set the monitoring time considering the margin of the personal computer load.
For the troubleshooting, refer to the following chapter.
Page 141 TROUBLESHOOTING
5 FUNCTIONS
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5.9 Driver WDT function
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