Finally a small process control system, in which the core device was multi protocol converter and the controlled object was a small boiler, was constructed.

然后以一小型锅炉为对象，以多协议转换器为核心设备，构建了能够兼容多种工业通信网络的小型过程控制系统。

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USS protocol used for communication between PLC and inverter can compensate for the lack of hardware interface converter and could realize multi-level reversible speed.

利用USS协议实现PLC与变频器之间的通信可以弥补变频器硬件接口的不足，能够实现多级正反转调速。

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