Aim\ To research the control methods of circulating pump in power plant and how to share information. Methods\ A small Distributed Control System(DCS) composed of Programmable Logic Controller(PLC) and WinCC is used to realize the control of circulating pump by PLC programmingand WinCC configuration. Results\ A way to control the circulating pump in hardware and software is found. Conclusion\ The open DCS composed of PLC and WinCCis featured as low price
flexible
openness. It can be widely used in middle or small control systems.