Proximity sensor help required

[plasticsales]

Ok, the diagram I show is correct but omit R2 and connect the proximity switch output to INx+ and connect INx- to ground. Make the value of R1 anything between 0 (ie a direct connection) and 470R assuming a 12v supply, its not that critical. More than 12v will need higher value. You can use the 12v output from the BOB but then you get no opto-isolation. Do you have any other power supply on the machine side?

Note the proximity switch connection shown in fig4 in the manual is for an NPN switch.

I am using a separate 12 volt power supply.

Thank you for your help I will have to order 470R I have some 1/2 watt 10K and 1.5K resistors.

[irving2008]

I am using a separate 12 volt power supply.

Thank you for your help I will have to order 470R I have some 1/2 watt 10K and 1.5K resistors.

I'd not bother and connect the sensor direct to INx+ since it already has 1k internally on the BOB.

[plasticsales]

Done that and works without resistor.
What it does do

Both the leds on sensor and BOB light up when the switch senses.
Mach3 says limit reached and stops motor.
All good

What it does not do is show led on mach3 screen, only a quick flash and the led on the screen does not stay on, is this due to the resistor?

I am getting 0 volt and then 12 volt when switch is activated, will a resistor reduce this voltage to 5 volt and then show in Mach3 screen?