CAUTION: For NPN output connections, the external interface voltage (Vext) 
must not exceed the Matrix 300N power supply source voltage (Vdc) otherwise 
correct output functioning cannot be guaranteed. 
CAUTION: For Matrix 300N PoE models, the internal Digital Output circuitry 
is not powered and supply power is not available to any Input/Output devices 
(Vdc=0).  Only  input  device  signals  can  be  accepted  directly  on  the  M12 
17-pin connector without power. 
For these models, if it is necessary to use Input/Output devices, we recommend 
connecting them through the CBX, which must be powered separately.