Design assistance device, design assistance method, and program

When equipment information relating to respective slave units is acquired, the slave units are grouped in accordance with the equipment information relating to the slave units and information relating to a definition file, and setting information that is transmitted from a master unit to the slave units and defines a communication behavior including the generation of a data frame is generated, the setting information such as is transmitted in the format of a frame in which a data field for each unit in which data is invalidated due to frame transfer abnormality is secured for each group is generated, the data field being included in the data frame in which control data relating to the slave units is stored. 获取各从属单元的设备信息，根据各从属单元的设备信息、定义文件的信息对各从属单元进行分组，在生成用于规定包含了数据帧生成的通信动作的设定信息时，其中数据帧由主控单元向发送至从属单元，所生成的设定信息以如下帧格式发送，该帧格式按每个组确保有因帧的传送异常而数据被无效的每个组的数据字段，所述数据字段包含在存储从属单元的控制数据的数据帧中。