High anti-interference, fast response Durable,high reliability, 3 relay, dual NPN/PNP out, perfect compatibility 1.Basic introductionSNA2220 light ... 120,200,280,360......2840mmSNAxx80 80,240,400,560......1520mm 3.Working principleThe protector consists of light curtain,signal cables, ... signal and outputs the closed or opened signal used safety relay,and then connects the control trip circuit of the ...