You should look at the PLC program.
Maybe a task turn it off after a while..
Surely it isn't due to Mango or Modbus!
Ok finally found the issue! I had created a binary 0 reset on the program I had wrote and was talking to mango at the same time. So everytime I had set a point in mango my program was reseting that point after 2 seconds.
So now that I finally have it all working I am running a BAC-HD150 bacnet controller for the Mitsubishi City Line system with Bacnet IP of course. And running custom valve and boiler control for large steam system. I am controlling that with Wago 750-841 Modbus Field Coupler. I will update you with my setup once all is done.
Thanks and hope this helps others.