Description
PLC构成的PCS系统比DCS的开放性所处的现状稍好一些。目前罗克韦尔AB公司已形成了多层结构体系，即Ether Net、Control Net、Device Net及Asi等现场总线(原DH+网也可兼容)。西门子公司在Profibus-DP通讯网络及Profibus-FMS网络以外，提出了S7 Routing网络
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