多項選擇題

關于艾默生電源監(jiān)控正確的有()

A.422監(jiān)控時必須把每個要監(jiān)控單元串成回路,否則無法監(jiān)控
B.光纖監(jiān)控時必須把每個要監(jiān)控單元串成回路,否則無法監(jiān)控
C.監(jiān)控單元最多能帶255個LC
D.08機的監(jiān)控單元只能用光纖監(jiān)控

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