The SCADA systems are now the basis for monitoring the flow and quality of a given medium. The article describes situations that may occur in the transmission system in case the medium is a gas that is not homogeneous for all sources. For this reason, the SCADA system faces big challenges, both to ensure correct data and operation consistency (7 days / 24 hours). The SCADA systems are the basis for additional systems: simulation systems - predicting what will happen in the transmission system, forecasting systems - consumption forecasting e.g. succeeding 24 hours and balancing systems - customer settlements.

This article describes the problems that may occur in SCADA systems specifically in simulation systems, in the absence of or invalid input data. The basis for the correct functioning of the simulation calculations cooperating with SCADA systems is correct input data. The input data for such calculations can be downloaded directly from devices located on industrial objects as well as can be created/generated - various types of conversions performed by IT systems.

This article describes situations in which invalid data causes disturbance of calculations. For example, in case of calorific value calculation, even a momentary invalid data concerning the gas composition may cause incorrect calculation results. The return to the correct calculation values of different cases may occur after a longer period.

The article describes how to deal with such situations. We also present what may happen in the case of receiving incorrect data for nonlinear elements as well as for input or output points. There are also examples presented how these situations may be dealt with, and what possible settings should be included in SCADA systems to eliminate such cases or limit their impact.

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