1D3243

 1D3243
1D3243
1D3243

整个控制网络根据系统不同功能层次采用三种通讯方式。厂区主干网即6个主站PLC之间以及主站与子站之间通讯均采用ControlNET冗余网络（A、B两条并行网线），6个主站采用Contrologix系列PLC,8个滤池子站PLC及脱水间PLC采用Compactlogix系列PLC。，通过各自槽架上的ControlNET通讯模块1756-CNBR相连接（对于Compactlogix系列PLC，直接与CPU模块1769-L35CR连接），通讯时如果A网出现故障系统可以自动切换到B，无需人工设置。为保证信号的稳定和介质的抗干扰性，在有高电压及大电流的区段（PLC4至PLC7，PLC7至PLC3）选用光纤作为网络介质。在PLC3、PLC4、PLC7之间通过6套光纤适配器1786-RPA和光纤转发器1786-RPFM实现ControlNET同轴电缆与光纤的转接。

　　各主站的上位机通过以太网连接。各主站配置一台光纤收发器，并通过集线器与PLC背板上的以太网通讯模块连接1756-ENBT，同时连接上位机。为保证整个系统的稳定及满足增加客户端需求的可能，在中控室设置一台光纤接口交换机，与各站点上位机连接，并连接位于中控室的两台服务器。

　　在PLC2处理器下挂的I/O机架以及PLC1、 PLC3A-H的触摸屏与控制器之间通讯同样采用了ControlNET网络冗余，保证通讯的可靠性。

　　中控室与黄壁庄取水口PLC采用DATA-LINC的SRM6100无线通讯产品交换数据。

　　以太网网络通讯速率为10/100M自适应，ControlNET网的通讯速度为5M/S，Controllogix和Compactlogix系列全采用CIP协议，该协议可以在以太网和ControlNET网上无缝路由，并且传输速度不会受节点的影响，时时保持5m/s的传输速度。图2、3分别示出设备的安装现场照片。

 

可组成局部网，不仅PLC，而且高档计算机、各种智能装置也都可进

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