Task of stackers is to strew (stack) the excavated material within the process of mining at the open-pit mine. For this purpose it’s equipped with a travel (mostly by a „walking“ travel) and booms with belt conveyors. Task of the PLC is to control movements of these parts (walking travel, a lift and belt running) by operator’s instructions. Supervising functions of the PLC are focused on monitoring level limits (temperature, pressure, liquid levels) and fault detection of technology including reacting to it. Visualisation assists an operator to control machine, allows to set service parameters and displays necessary data for machine operation. Control of walking travel can be set to automatic mode, which accelerates process of walking travel due to better connections between individual sub-movements, which is useful when a giant machine is moving over long distance.