The RTC Editor is used for system definitions, while the RTC_FB is used for Fieldbus device definitions including block tag, control loop, and segment schedule setups. There are two kinds of control strategy that can be operated in the Harmonas-DEO system; control in the DOFC controller and control in the field (devices). The steps for setting up the Fieldbus system can be grouped into the following; - Define the control strategy and instruments (see Figs.9∼10). Downloading the control strategy to the DOFC.