The advent of PLC controls in mine hoisting resulted in the development of the Digital Hoist Supervisor, or DHS, a modernization of the classic mechanical Lilly controller. A system of redundant PLCs and position encoders provides overspeed and overtravel protection for all positions in the shaft, for all types of hoists. The Tiley DHS is also self-monitoring and provides more operational data (through an HMI interface) to the operator for troubleshooting of faults. The DHS may be integrated with a new Tiley hoist control system, or as a stand-alone retrofit to an existing hoist control system. Regulatory approved since 1996 in Ontario, the DHS has been installed in Canada, the USA, Venezuela, Peru, and Brazil.