A when apply the company that stride contest to apply the company that stride contest to roll out new-style safety can make up Cheng controller (safe PLC) -- PROTECT PSC. The characteristic with this the oldest product was to use modular structure, the user can need according to his, output module through choosing appropriate input, achieve optimal design combination. Price of tie-in and cabinet, agile, sex compares this system volume tall, it is to be contented and advanced production technically to system and sophisticated machine ask and be designed, can apply extensively at the tradition such as product line of numerical control machine tool, automation and machining center to protect the situation that many safety relay needs below means, came true to be opposite urgent stop switch of pushbutton, pullswitch, exit, spacing switch, smooth act / equipment of grating, both hands and PNP safety sensor safety monitoring. Current, the module sort that this system can offer has 13 kinds, include power source module, CPU module, have passive contact output of active of input, active input, semiconductor and relay are passive output, and mix model assorted module. In addition, PROTECT PSC is integrated still the process designing function that has groovy PLC, can achieve the safe to be not input, monitoring that outputs signal and administration. Programming language can choose echelon to pursue (LD) or the KOP programming language that accords with IEC61131 standard. CNC Milling