Could question pertain to the Banner Engineering QS18VN6D?
If so, here is a link to their web site:
http://www.bannerengineering.com/pro...lectrics/qs18/
Document number 63908 provides some technical information and it is found under the literature link. The device requires 12VDC to operate and provide a normally closed and a normally open contact outputs that can be connected to the digital inputs.
Good luck.