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Messages - subpilot

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General Discussions / Re:ADC Fluctutations.
« on: January 12, 2011, 04:27:38 PM »
Is the shield of the sensor cable grounded? An un-grounded shield cable can induce all kinds of noise in the ADC input. Also if the sensor cable is very long, you want to ground the shield only on one side, preferrably on the sensor side in order to prevent ground loops, which are also a source of noise.

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Technical support / Re:Looking for MORE advice with 2-wire switches
« on: August 12, 2006, 09:46:59 AM »
If the pressure switchs has a dry contact switch you may have dirty contacts. I assume that you are using the switch as an input to the PLC and one side of the switch is tied to ground to get the input to 0V when pressure is on and to Vcc when the switch is open (no air pressure).

Also if the switch is located far away from the PLC the wire gauge shold be large enough to prevent large voltage drops from developing in the circuit.

I hope this helps.

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