Workers in the operation in an irregular state, and machinery in operation can not identify people's actions, is likely to hurt the workers are operating. This requires an intelligent device to identify people and control the device switch. SIKUN safety light curtain with this intelligent identification function, a good coordination of the relationship between man and machinery. As long as the device or a dangerous area to install the light curtain it can quickly identify the person's finger or arm, through the start switch to stop the mechanical action.