On the information security of ACS TP negatively influenced by increasing their integration with enterprise systems management, as well as the wide spread of remote access technologies. Additional information security risks arise on the background of the smooth transition analogue of technology on hardware platform based x86, and active implementation of IP technology in the ACS environment. The combination of these factors contributes to the formation of a wide range of threats from external to the process control system network. Existing technical and policy proposals on information security mainly focused on the solution of security problems of the upper levels of management. This report focuses on the problems of information security of the lower level ACS TP and description of the proposals of the authors on the possible ways of their solution in the framework of information security systems for whole power unit.