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General Mach Discussion / Limit Switch Noise Triggering

« on: August 04, 2008, 09:41:33 AM »

I'm having a problem with Mach3 recognizing noise comming in through my limit switches as a limit trigger for estop. Basically I'm using rather high power servo motors which are causing periodic noise (at a frequency of 4khz) which is contantly triggering the limit estop in mach. I have methods in place to prevent the noise affecting any other systems. The easiest thing it seems would be to use low pass filters because I don't need instantaneous estop's in mach just something fast enough, like a tenth of a second really. Is there any way in place for mach to ignore the noise on the line, or is there already some sort of low pass filter in place or something else to help not so much remove but ignore the noise? I just want something simple. I don't want to have to buy a bunch of capacitors and have to install them for filtering. Something software based would be much cheaper I think.