Simulation does not load EEPROM values immediately before execution

[obscuresc]

Hi,

I've observed that during Simulation the user defined default EEPROM values do not load before task execution. Instead, a zero value seems to be passed on first cycle execution. I observed this due to a divide-by-zero error in simulation.

PLC EXECUTION ERROR: Fault in task Background, exception 0xC0000094 at 0x7C4DAFA

I am not observing the same issue on physical hardware. Should simulation perform the same as the hardware? Or should I not assume EEPROM values will be read prior to execution? Nor use EEPROM limits to prevent division-by-zero?

Thanks.

[Bastian_Schmitz]

Hello,

Your problem will be that you have an error in assignment of Pointer. This happend if you missed to use an ADR function in front of a @Var Input of a FB/FC. This generate normally a error like you describe. Please check this. I would expect that the initialisation of EEPROMs are not the fault.

best regards

[FedericoM · Accepted solution]

Hello,

I just verified it, it's a simulator bug, simulator starts before the end of the download all procedure so if you perform a division by a parameter it will cause a division by 0.

The only workaround is add a protection on your project in order to avoid division by 0.

It's just a simulator issue, download all on real target is performed with PLC stopped.

[obscuresc]

Thank you @FedericoM, @Bastian_Schmitz.

I'll apply a work around.

Will this bug be resolved in a future version?