Hi Cristoval, and welcome to the Community!
The X67AI1323 is definitely compatible with the X67 bus controller. It sounds like the module is communicating okay with the controller (to double check, you can make sure that the ModuleOk datapoint is true).
This is the input evaluation circuit (from the Automation Studio Help):
To me, it looks like the module is comparing the signal from pin 2 (Input+) to pin 4 (Input-). What happens if you connect the 0V wire to the IN- pin (I’m assuming that you have it connected to the Ground pin now)?