当网络负荷超载时，网络枢纽控制器就会通过丢弃一些低优先级的数据，来保证高优先级数据的实时性。
When the network is overloading, the Central network Control Unit can perceive it and dropout some low priorities fluent to keep the real time behavior of high priorities fluent.
可编程控制器(PLC)具有强大控制、模拟量处理和数学运算等功能，使其能够应用于起重机力矩超载保护中。
Programme logic controller (PLC) has the function of mighty control, analog signals transaction and mathematics compute, it insure that PLC can be used on the crane moment limiter.
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