Abstract: A recovery plasm deslagging control system is designed by utilizing modern digital control technology and the logic control module and its extending module of the software LOGO!.The hardware and software are designed in detail.Man-machine interface control board is also designed.And the software is simulated online in detail.The correctness,integrality and feasibility are indicated by the simulation result.

Key words: recovery plasm；control system, LOGO!, control board, online simulation