Visualization of the technological process of aluminum electrolysis in SCADA-system CIMPLICITY is considered, the main screen forms of electrolysis and their interconnection are presented. The upper level of ACS represents an automated workplace of the operator of the control system of the electrolyzer series, which includes 23 apparatuses. The process visualization project has a structure with basic functions of data exchange with controllers, functions of logging, statistical analysis, operational calculations, including possibilities to influence control actions formed by output channels of the system.