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Parallel Port breakout boards, motherboards, and dedicated accessories / Re: PMDX-126 NPN-NO Proximity Switch Problems
« on: November 13, 2015, 09:02:32 AM »
As per my experience the LED in the proximity sensor is causing enough leakage current into the PMDX-126's inputs that the PMDX-126.
Also it has PNP sensors connected and that they are active. If you have a volt meter or DMM handy, you can verify this by measuring the voltage between the "Pin11" screw terminal and the "GND" terminal.
If you see a voltage somewhere around 9 volts or higher or higher with no metal present then that is the issue. You can also look at the LED on the PMDX-126 next to the "Pin11" terminal.
pcb quote
Also it has PNP sensors connected and that they are active. If you have a volt meter or DMM handy, you can verify this by measuring the voltage between the "Pin11" screw terminal and the "GND" terminal.
If you see a voltage somewhere around 9 volts or higher or higher with no metal present then that is the issue. You can also look at the LED on the PMDX-126 next to the "Pin11" terminal.
pcb quote