CNC4PC C11G User Manual page 12

C11G (Rev. 7.1) User Manual
Fig. 9 Wiring diagram to connect in parallel NPN open collector proximity sensors.
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7.3 Connecting NPN sensors with internal resistor.
Some NPN proximity sensor has a pull-up resistor internally (Rx in the Figure 10).
It is necessary to know its value in order to connect safely the sensor with the
BOB. To know the Rx value is recommended the follow procedure.
Note: Are
necessary an external resistor (recommended 4.7KOhm to ¼W) and a multmeter.
Fig. 10. Knowing the internal resistor value in NPN proximity sensors
Revision: 28/01/2009 http://cnc4pc.com/TechDocs/C11GR7_1_User_Manual.pdf 12/19