The RMC uses optocoupler interfaces to the motor drivers, end switches, waveguide-switches, blowers and heaters, pressure pump and to the temperature control. This permits to use a complete separate power supply with a separate ground for these circuits (+24V EXT, GND EXT).
To simplify the cabling of these circuits, the RMC distributes the external 24V and GND lines through a separate clamp (CON20).