A safety control system is provided, which is capable of monitoring many more drive circuits by using a single controller without modifying the configurations of the controller and the drive circuit. An a-contact of a relay is electrically connected between a FB (feedback) output terminal and a FB input terminal of a safety controller. A b-contact of the relay is electrically connected between a signal output terminal (safety output (1) terminal) of the safety controller and a signal input terminal (safety input (1) terminal) of a safety drive circuit. A coil of the relay is connected to a FB monitor output terminal of the safety drive circuit. No factor in a large voltage drop is present between the FB output terminal and the FB input terminal, thus making it possible to monitor many more drive circuits by using a single controller.