R.D. stands for relocation device. This detects when the machine is moved and tripps something in the control so it does not work. This is how Mazak keeps track on where their machines are. (so they don't break trade laws) There is a battery backup in this unit also. To get these alarms either the battery was dead too long or you possibly bumped this unit inside of the electrical cabnet. This must be reset by a Mazak technician. Call your local Mazak service center.