Yes, of course it can, reason being the controller IP address is different.
I’m at work now and so here is a screenshot of PAC Display running the same strategies on two different controllers.
Exact same strategy, but two different controllers.
The key is that when you connect your PAC Display gadgets, you select the appropriate controller.
Select your gadget, control driven attribute, then you FIRST select your controller, THEN your tag in that controller.
This way, when PAC Display runtime starts up, it will scan the gadgets on the page, build the OPCUA requests to that controller IP address and get those tags, then it will scan all the other controller IP address tags… Two controllers, same strategy tags, same PAC Display page different gadget states based on the tag value from that IP address.
As for active PAC Control controller… You can only have one controller per strategy (unless you are talking about our PAC Control Pro feature of redundant controllers or network - are you?)… so yes, when you select the active controllers, all the others are parked to the side and are not scanned by PAC Control. (Note that setting the PAC Control active controller does automatically change the IP address of that controller in PAC Display - if you change the active controller in PAC Control, you need to change the IP address of the controller in PAC Display Configurator and restart the runtime).
If you right click on the controller you can see that set active option.
Note how its grayed out when there is only controller;
Unless you are changing which controller you are running the strategy on, there is no need to have a bunch of controllers stacked up in the list. There is only, the top, active controller for that strategy at a time.