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[接第7期]5控制与通信5.1控制与通讯方案为确保升船机运行的安全性，并达到主提升电力拖动系统的设计要求，拖动系统的控制与通讯方案如图4所示。5.2PLC与变频器之间的通讯(1)主通讯方案：PROFIBUS-DP现场总线从80年代中期开始，现场总线控制系统的出现在工业自动化技术领域中
[No. 7] 5 Control and Communication 5.1 Control and Communication Solutions In order to ensure the safety of lift ship operation and meet the design requirements of the main upgrade electric drive system, the control and communication solutions of the drive system are shown in Figure 4 . 5.2 PLC and inverter communication (1) the main communication program: PROFIBUS-DP field bus from the mid-80s onwards, the field bus control system in the field of industrial automation technology