Hello everyone, this is my first post on this forum but it's helped me in the past and hopefully it will help me now. I'm trying to get a first generation KTP400 basic mono PN (6AV66470AA113AX0) to communicate to an S7-1200 (1214C DC/DC/RLY 6ES72141HG400XB0). I can fully download to and go online with both components, but the HMI will not communicate with the PLC for some reason. The panel which the HMI was in had its power cycled and on startup the HMI displayed a black screen. It was sent to us, and after waiting for a few hours/power cycling a few times, I get it to boot, but it just waited on the loading screen and wouldn't respond. A while later and with some more power cycles it started working. It fully works and responds now besides no communication between the PLC and HMI. I've already factory reset the panel as well, to no avail. The PLC is different than the one in the panel, a few years newer which we use for testing, but the program ported over without errors. I don't have much Siemens experience, so any help would be appreciated.