Photovoltaic energy storage system (PVESS) is a very promising form of energy system, which can integrate multiple forms of energy and is an important means to accommodate renewable energy. Through the reasonable control strategy, the utilization rate of photovoltaic power generation can be improved while reducing the power fluctuation in the process of system operation, and the operation quality of the actual power supply system can be improved. However, most of the existing control schemes complete the system control through specially developed controllers, and the control program runs on the controller in the form of firmware, which is difficult to migrate between different controllers. In this paper, based on IEC61499 standard, a soft-PLC system is proposed to realize the control of photovoltaic energy storage system. The simulation results show that the control program can be transferred on different hardware, and effectively improve the development efficiency of distributed control system.