labview 运动卡控制伺服怎样搜索原点？

本人新手，正学lv运动卡控制，这方面资料很少，特别是原点搜索的具体过程，找不到资料。OMRON PLC原点搜索是先搜索到原点接近感应开关后，再检测到Z相脉冲或原点感应开关，此点即为伺服原点。但不知LV运动卡是否也是这样找原点的?求高手指点，要是能提供相关资料就更好了。

补充内容 (2017-6-12 20:06):
有大神指点一下吗?

NI-Motion provides two built-in VIs, Find Reference and Wait Reference, to accomplish these tasks. Find Reference performs search sequences to find and stop on a specific edge of the home input, find the next instance of the encoder index, find the center of travel between forward and reverse limits, or find the forward/reverse limit. Wait Reference returns when an initiated find has completed. In this way a repeatable reference position that is accurate to one encoder count is established，好象是说找中心点或极限点