PISO-DNM100 is a DeviceNet Master solution in ICP DAS. Because of the built-in high efficiency CPU, the PISO-DNM100 especially qualifies to apply in real time DeviceNet application systems. Therefore, PISO-DNM100 attracts the customers’ attention. In order to improve the efficiency and usage of PISO-DNM100, the PISO-DNM100 DLL is promoting to the version 2.0. The version 2.0 not only reduces the quantity of the DLL functions but also improves the efficiency of the firmware greatly. The DLL functions are also upgraded as the asynchronous functions. It not only reduces the complexity when developing user's application programs, but also can enhance the potency of user's control system.