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Old April 6th, 2006, 05:21 PM   #5
panic mode

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Join Date: May 2003
Location: Toronto, Canada
Posts: 1,962
we do a lot of work with npn guys (japanese car makers).
positive side of 24V supply for I/O is grounded. safety circuit is on separate supply and that supply has negative side grounded. i've never seen it but i was told that in japan one can buy safety products like light curtains with pair of npn outputs.
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