The SafeRobot interface on the control cabinet offers an additional slot for the second data cable in the connecting cable set Safe, which is necessary for SafeOperation.
The two data cables of the connecting cable set Safe generally connect the safety logic of the KR C2 with the SafeRDC on the robot (see Cross Sectional Technologies / KUKA.SafeRobot / SafeOperation - Axis-specific)

Ordering information / limitation
The cabinet interface SafeRobot is required in conjunction with SafeOperation