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The info presented in this document may be of interest to you. http://cnc4pc.com/Tech_Docs/C10R10_USER_MANUAL_V2.pdfYou need to establish the voltage and if they are NPN or PNP. If this information can't be determined then it may be wise to replace then with new parts of known specification.Tweakie.
I think most proximity switches can handle 12 volts (think I read that somewhere). There must be a way to test the switch to see if it's NPN or PNP? 8 switches at $75 each isn't going to happen, must be a way to try and wire up one switch as a NPN and try it, if it doesn't work then it must be PNP?