RJ Controller security issue (NEEDED CAT4 security)

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Hello all,  

I am having FANUC with RJ controller and i am hoping to have PLE CAT4 security for it. I am interested to put 2 of the safety contactors after the major contactor is sending power to the 6 drive robot. Can anyone of you tell me what is normally utilized for the CAT4 safety along these controllers?

Thank you