Abstract: The subject of the research is the questions of information security and resistance to unauthorized penetration in automated process control systems. The results of statistical analysis of incidents, failures, accidents and fires on industrial facilities which have different levels of automation are presented. The solution which completely excludes an opportunity by means of a malicious code, to interfere with managing functions of industrial controllers is presented by development of the additional programming module providing data exchange in SCADA system and in managing controllers. The methodological basis of the research is the systems analysis and system synthesis of processes and means in automated systems. The main result of the research is the solution which completely excludes an opportunity by means of a malicious code, to interfere with managing functions of industrial controllers. The price of such solution is the development of additional programming module which will provide data exchange in the SCADA systems projects and in projects of managing controllers, hiding communication parameters, and also random access to memory of managing controllers.