Integration of the latest AC drive technology with cutting edge PLC technology provides the backbone for Omron Land Drilling Systems. Omron Oilfield & Marine control houses form the center of rig intelligence by regulating and controlling all electrically actuated drilling equipment. AC drives regulate the drawworks, mud pumps and top drive, while motor control centers actuate remaining auxiliary and peripheral loads. Engine-generator control cubicles regulate the prime movers. The latest in rig control software is embedded within the PLC structure, which synchronizes all drilling functions as well as performing top level control automated functions. These functions include auto-drilling, mud pump synchronization and pump pulsation pressure limiting.