可以参考使用手册7.1部分下列内容：
7.1 Message types
The SIWAREX FTA messages are divided into different types.
Asynchronous messages can be generated at any time by an unpredictable event. The internal and external hardware faults(operating messages) and the technology messages that can occur spontaneously during a weighing procedure.

Hardware error在FTA模块中属于Operating message，应该可以用DR30中的Operating error代替