Aluminium Profile Type Router - Initial questions

[Kitwn]

The black wire is the output of the sensor. It is pulled up to the supply voltage by an internal 10k Ohm resistor until the output transistor conducts and pulls it to near zero volts. 'Normally Open' (NO) means the transistor is not conducting (output pulled high by the resistor) until the sensor is triggered. 'Normally Closed' (NC) means the opposite. Only NO types can be connected in parallel as shown in your diagram, any single output pulled low will pull the others with it and the input to the controller. NC types (which you have according to the diagram) must be connected in series since, if in parallel, all the outputs will be normally low and the ONE that tries to go high will be held low by the others. Unfortunately your AXXB manual image does not explain that but the text should.

EDIT: Your controller software should include a configuration for selecting whether your sensors are NC or NO. If you get continuous limit alarms then that my need to be changed.