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Data acquisition of the SCADA (Supervisory Control and Data Acquisition)-system is its integral part, which get data from sources of different type. The nature of data, which operates SCADA, is characterized by signals of basic value's types (Integer, Real, Boolean and String). The signals vary over time and has their history — life. In the theory of technological processes (TP), under the signal means the value of TP sensor in the ADC code — "raw" signal or in the real value — engineer one. Signals can be combined into groups, which are often called parameters or complex tags. For example, the advanced data sources can provide the structures of parameters with the predefined set of related signals. In addition to the direct data acquisition, to the function of this mechanism also includes the transfer of actions on the executive control devices of TP, usually it is: latches, pumps and control valves. Taken together, this equipment is known as Matching to Object Device (MOD).