Development Status of Epics Application for Pls Computer Control System

The control system for Pohang Light Source (PLS) was designed about twelve years ago and has been working without serious problem so far. However, as the demand for the application programs for accelerator physics and data analysis increases, the present control system shows the lack of flexibility and control speed. To have faster and more flexible performance, we have decided to convert the current control system into an EPICS-based one on the two-layered hierarchical Ethernet network. EPICS Toolkit will be applied to our system while preserving our investment in most hardware. All EPICS system will be replaced to ensure homogeneous layout for PLS linac and storage ring. This paper presents the status of the application development with EPICS on a test bed system and the future plans.