How to tackle system fault WDT:0 in M172P controllers?

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The controller showed "system fault" and "WDT:0" when there is an exception (division by zero) or array index overflow.
Typically the customer upload the PLC program and not the parameter configuration.

The correct way to upload an application select the "Download All" Option from Device.
With a TM172 the procedure to compile an application is the follow:
1-Compile in Application (PLC)
2-Compile in User Interface (HMI if any)
3-Build in Connection
4-Open device from Connection (select Open Wit Device from the menu Tools)
5-From Device connect to target and select the download All button.
If the problem still present , try to remove the program from the Task Timed /Background one by one until the problem is resolved.