In general, you use the "DF1 Devices" driver set up for DF1 Full Duplex and the COM port that is represented by your USB/Serial converter.
Because the 1784-U2DHP appears to Windows like a serial port and uses DF1 full duplex protocol over USB, that driver works by coincidence with your MicroLogix.
The MicroLogix 1400, of course, also has Ethernet built-in. But let's solve one problem at a time.
I recommend an excellent live + screen demo of how forcing works on the MicroLogix 1100 (a very similar controller) by Friend of the Forum Tim Wilborne, on YouTube:
https://www.youtube.com/watch?v=Hop3X-Smi6E
I believe the MicroLogix 1400 doesn't use the same "forces are always enabled" method as the MicroLogix 1000, 1100, 1200, and 1500, which is why the Forces Enabled is always highlighted yellow on those controllers.
Open your Status data file, and maybe switch to Binary instead of Structured, to see if I/O forcing is disabled by bit S:1/5.
The fact that the force "ON" notation is in black instead of red "
>ON", and the Forces Disabled status showing, suggests that S:1/5 = 0.