The EXECUTE_SAFE_REF command is the right command for triggering the this safe referencing. Unfortunately I have no experience with the CS9 safety, because we have only a CS8 in our laboratory, but I would say that your procedure sounds conclusive.... By the way : This safe referencing is only needed, If you use the safe-workspace feature. If you have a protective housing, that is big enough, that the robot can not collide with the hounsing, or your housing is strong enough, that the robot can not break through, then you don't need this feature and no safe referencing is needed... But this depends on your applikation.
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