User`s manual

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MELSEC
11 TROUBLESHOOTING
11.6 Measures for WDT error occurrence
The following explains the causes of WDT error occurrence in CC-Link board and
measures for them.
(1) Cause of WDT error occurrence
The WDT error occurs in CC-Link board as follows:
1) CC-Link driver cannot operate because the PC or OS is hang up.
2) The CPU cannot start to control the CC-Link driver within the WDT time, as
the other drive has occupied the CPU processing.
In case 2), the WDT time has to be adjusted, as affected by the operation of the
PC or other driver.
For details, refer to (2).
(2) Adjusting WDT Time
The following explains adjusting the WDT time.
The screens of Windows
R
XP Professional are used in the explanation.
Therefore, the screens and file names to be executed are slightly different from
those of other operating systems. Adjust the WDT time with reference to
REMARK
.
1) Insert Disk 6 into the floppy disk drive.
2) Open [Start] [All Programs] [Accessories] [Command
Prompt].
REMARK
When Windows
R
95, Windows
R
98 or Windows NT
R
Workstation
4.0 is used, open [Start]
[Programs] [MS-DOS Prompt].
When Windows
R
2000 Professional is used, open [Start]
[Programs] [Command Prompt].
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