To create a connection to some block it is possible to right-click on a pin of some block and choose: Connect with Block...
But Connect with Block... option is not listed when I right-click on the Off parameter's pin of the Up/Down counter. I was not able to find any Block which is compatible with the Off parameter of the Up/Down counter. Is there any?

Closed cause question posted twice.

The second thread with the subject Is it possible to read values from Modbus and using them for changing Off parameter of Up/Down counter only if some condition is meet? is published within the conference LOGO! - Software.