In a robot system that is configured by a master controller and a slave controller, an input path of a safety input signal and an output path of an enable signal outputted from a safety monitoring unit within the master controller are wired to enable output outside of the master controller, an operating switch and the master controller are connected by a connection cable, the master controller and the slave controller are connected by a connection cable, a control unit of the slave controller is connected to the input path of the safety input signal, and a contact for power is connected to the output path of the enable signal.