Adding pull-up resistors when connecting an output device to an auxiliary input signal ensures proper voltage levels on input signals. Attach an external pull-up resistor between the voltage source and the AUX_IN pin, particularly for sinking configurations. Choose a resistor to avoid overcurrent.
When integrating proximity detectors, auxiliary inputs detect current flow between the AUX_IN and AUX_IN_COMMON pins, signaling On or Off. Each input (AUX_IN3, AUX_IN4, AUX_IN5, AUX_IN6) shares the AUX_IN_COMMON pin. Depending on the device type, all inputs must be in the same configuration (sinking or sourcing).
