... .Working principle The protector consists of light curtain,signal cables,controller and control cables.The light curtain ... configuration:Emitter/1,Receiver/1,N type controller/1,Signal cable 3m/1 root, 5m/1 root , ... allowed to choose W type controller,at this time ,signal cables are 2.5m/1 root,4.5m/ ... be made on order.If the length of signal and controller cables need to lengthen,the special ...