SIMATIC WinCC Open Architecture Forum

Hi

I've noticed that dpConnect() keeps calling the callback function, even if the value of the input parameters do not change.

dpConnect("callbackFunction", dp1:_online.._value)

If I put a DebugN inside the callbackFunction, I keep seeing in the log that the function is called.

dp input parameters have an OPCUA subscription as pheriphery address. But their value don't change.

There's something I'm missing ?

Thank you

https://www.winccoa.com/documentation/W ... =dpconnect

you need to set answer parameter to false

Perhaps the same value is written multiple times. Are other attributes (like the timestamp) changing?

The "wantsAnswer" parameter only defines if the work function is triggered immediately when doing the dpConnect().
During runtime it has no effect if the parameter is set to to true/false.

Best Regards
Leopold Knipp
Senior Support Specialist

Oh, sorry. I misunderstood Mgiacome's problem.

Thanks all, the cause was the low level comparison setting unchecked inside the pheriphery address of the datapoint .... sorry