The project involved the preparation of technical documentation and switchboards for the automatic control of a 4 x 315 kW circulation system. A programmable logic controller, manufactured by Omron, provides automatic control of circulation and dictation pumps, which are driven by frequency controllers. Communication of frequency controllers with the PLC is a profibus. There are also M-Bus communications with ultrasonic sensor units. The PLC is connected to the existing communication network of programmable logic controllers and implemented in the existing Wonderware InTouch SCADA.