C10- PARALLEL PORT INTERFACE CARD Rev. 10 - CNC4PC

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C10 (Rev. 10) User ManualFig. 6 Wiring diagram to connect NPN proximity sensors with internal pull up resistor.Some NPN proximity sensor has a pull-up resistor (R1) internally. It is necessaryto know its value in order to connect safely the sensor with the BOB. Follow thisrecommendation:Connecting NPN open collector proximity sensor with the C10(R1+R2) Value (12V)Aprox. 10KΩ(R1+R2) Value (24V)Aprox. 25KΩRevision: 01/27/2010 http://cnc4pc.com/TechDocs/C10R10_User_Manual.pdf 12/18
C10 (Rev. 10) User ManualCalculating the R1 value.Note: Rx is the unknown resistor value.R X = V EX .(R/V) - R (1)Where:V EX is the external power supply voltageV is the voltage across the R resistorAn external resistor and a voltmeter are required to calculate the internal resistor (Rx)value.Note. The user should know the R value to do this operation. A 4.7KOhm @ 1/2W isrecommended.SAMPLE: if you are using a 12V power supply (V EX ), and using a 4.7KOhm asexternal resistor (R), then the voltage across R should be 6V, using the equation 1,the Rx value is 4.7KOhm.Revision: 01/27/2010 http://cnc4pc.com/TechDocs/C10R10_User_Manual.pdf 13/18
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C10- PARALLEL PORT INTERFACE CARD Rev. 10 - CNC4PC

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