The proximity sensor signal's value doesn't change when parts are in proximity.
Check the setting "Activate Assigned signals only" in the Options / Simulation dialog.
When not selected, the signal should change upon proximity of the designated objects
When selected, then the signal has to be connected to some logic such as a Logic Block or Module.
Note this setting was added in Tecnomatix version 16.1. Before version 16.1 having the signal connected to logic was a requirement.
Notes