Combined stockyard machines
Combined stockyard machines are used for stocking coal at thermal power stations. Task of these machines is to deposit, and if is necessary, also repeatedly excavate coal. The PLC, in addition to monitoring limit states (positions, values) and controling invidual parts of technology (the bucket wheel, belts, slew, hoist, travel), also manages establishment of route for transported material (stocking and excavation). The PLC is responsible for more complex functions as a startup of established transport route (including links to belt transport for coal preparation plants) and in case of customers requirement also standard and auto-mode excavation. Visualisation gives the operator an overview information about machine operation including actual states of individual parts of technological unit and allows them to enter parameters that affects behavior of the machine.