US Patent 10067491 Automated drilling controller including safety logic

An automated drilling rig control system in which one or more intelligent algorithms are in two-way communication with a rig control system and are configured to provide continuous external control over the a rig control system includes a safety logic module deployed between the intelligent algorithms and the rig control system. The safety logic module is configured to automatically close a communication pathway between the intelligent algorithms and the rig control system thereby preventing the intelligent algorithms from controlling the rig control system when an unsafe condition is detected.