Well, easiest way would be.
Go to tags, create a new tag (internal, BOOL) called Tag3.
Hit the script tab in the bottom.
To the left you have all your tags, expand tag 1 and DoubleClick ValueChange.
A new eventhandler is created for you
Code: Select all
void Tag1_ValueChange(System.Object sender, Neo.ApplicationFramework.Interfaces.Events.ValueChangedEventArgs e)
{
}
This function will be called every time the tag changes value.
Now we have to check if the tags are both true and if they are lets set our third tag to true as well.
Code: Select all
void Tag1_ValueChange(System.Object sender, Neo.ApplicationFramework.Interfaces.Events.ValueChangedEventArgs e)
{
if(Tag1.Value == true && Tag2.Value == true)
{
Tag3.Value = true;
}
else
{
Tag3.Value = false;
}
}
So now we check if both are true then we set Tag3 to true or false.
But right now we only check the status each time Tag1 is changed, we also need to do this when Tag2 is changed.
Code: Select all
void Tag2_ValueChange(System.Object sender, Neo.ApplicationFramework.Interfaces.Events.ValueChangedEventArgs e)
{
if(Tag1.Value == true && Tag2.Value == true)
{
Tag3.Value = true;
}
else
{
Tag3.Value = false;
}
}
This will work but it creates duplicated code, which is BAD!
Let´s create a little function that we can call from each eventhandlers.
Code: Select all
void DetermineStatusForTag3()
{
if(Tag1.Value == true && Tag2.Value == true)
{
Tag3.Value = true;
}
else
{
Tag3.Value = false;
}
}
And call the function from the eventhandlers
Code: Select all
void Tag1_ValueChange(System.Object sender, Neo.ApplicationFramework.Interfaces.Events.ValueChangedEventArgs e)
{
DetermineStatusForTag3();
}
void Tag2_ValueChange(System.Object sender, Neo.ApplicationFramework.Interfaces.Events.ValueChangedEventArgs e)
{
DetermineStatusForTag3();
}
Of course we can make this even better and more flexible by passing the tags as parameters to the function and so on... But that’s the next lesion.
Complete code
Code: Select all
void Tag1_ValueChange(System.Object sender, Neo.ApplicationFramework.Interfaces.Events.ValueChangedEventArgs e)
{
DetermineStatusForTag3();
}
void Tag2_ValueChange(System.Object sender, Neo.ApplicationFramework.Interfaces.Events.ValueChangedEventArgs e)
{
DetermineStatusForTag3();
}
void DetermineStatusForTag3()
{
if(Tag1.Value == true && Tag2.Value == true)
{
Tag3.Value = true;
}
else
{
Tag3.Value = false;
}
}
Now you can use Tag3 to show or hide your light.
Best Regards