Despite the rapid arrival of technology, technology development is slow. This is an effective programming. This research paper presents an example of the state of finite automata on the example of vending machines.

Keywords: State machine, Structured text, IEC 61131-3, CoDeSys, object-oriented programming, CASE, inheritance, interfaces, methods, state

The use of modern innovative control systems for heat supply in the housing and communal services is the task of today. Within the framework of the program of energy-saving technologies, an automated system for monitoring and controlling the parameters of the coolant in the housing and communal services is proposed. The proposed system is based on industrial controllers with Ethernet 100 Base-T, RS-232 and RS-485 interfaces and software created in the freely distributed version of the Owen CoDeSys package.

Keywords: shut-off valve, shut-off and control valves, CoDeSys, proportional-integral-differentiating controller, pipeline fittings