Matrox 4Sight EV6, Installation And Hardware Reference

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46 Chapter 2: Getting started with your Matrox 4Sight EV6 unit
Connecting a 2-wire proximity sensor to an auxiliary input signal
You can connect a 2-wire proximity sensor to a Matrox 4Sight EV6 auxiliary input
signal in either a sourcing or sinking configuration (that is, on a positive or negative
power wire). Note that in both cases, you will need to install an external bleeder
resistor, to ensure that a minimum amount of current flows into the proximity
sensor in its on-state and in its off-state.
The bleeder resistor’s value should guarantee that the minimal required current is
provided to the connected sensor (the third-party device). Typically, a 2.2 KOhm
bleeder resistor should be sufficient. For details regarding the sensor’s minimum
current requirements, refer to its documentation. Note that you should use a
bleeder resistor with an appropriate power rating for your circuit.
• For the auxiliary input signal to source the current (that is, to connect an auxiliary
input signal on a positive power wire), connect the 2-wire device to the auxiliary
input signal as shown below. You must also install an external bleeder resistor
between the pin and brown wire of the proximity sensor.
Equivalent circuit only
Brown wire
Blue wire
2-wire NPN
proximity sensor
24V
Sensing
Circuit
AUX INn- _
AUX INn+ _
Matrox 4Sight EV6
in a sourcing configuration
+
-
Optional because the auxiliary input signals are electrically isolated.