Hello COPA-DATA,
thank you very much for your help. Defining that parameter in project.ini has helped us, but
we got another problem. The problem is still related to the problem of changing the state of a variable using the method:
// 4. SWITCHING STATE
variable.SetValue(variable.GetValue(0), newStatusInt, DateTime.Now.Minute, (Int16)DateTime.Now.Millisecond);
Current status:
- it works for internal variables after checking “State / Timestamp for Intern Driver variables” option or after added the parameter to editor project.ini
- it also works for external variables, but only in simulation mode

- but it does not work for external variables with a real connection already
Right now I have no idea where the problem may be. If it is not necessary to take any action to confirm the writing of a new value via Driver or something similar. Please do you have any idea what the problem might be? Please, if you would like more information to help you to solve the problem, don't hesitate to tell me.
Best regards