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近年来出现PLC利用网络技术来实现分布式采样已成为一种共识,即在被控点附近设置采样单元,就近完成被控点状态的采样和输出控制,各采样单元间通过工业控制网络相连构成监控系统的下位机系统。该网络可根据用户需求构成冗余网络,在技术上充分满足了现场采样的需求。在上位机监控系统中,采用图形化的监控终端来完成受控设备的集中控制、数据分析、统一调度和管理。在上位机和下位机之间的通讯,可选择工业控制网以构成本地监控系统,或选择电话线路等以构成远程监控系统。
In recent years, the use of PLC network technology to achieve distributed sampling has become a consensus that in the vicinity of the controlled point set sampling unit, near the completion of the state-controlled sampling and output control, the sampling unit connected through the industrial control network constitute Monitoring system of the crew system. The network can be based on user needs constitute a redundant network, technically fully meet the needs of the scene sampling. In the host computer monitoring system, the use of graphical monitoring terminal to complete the controlled equipment, centralized control, data analysis, unified scheduling and management. Communication between the host computer and the next crew, the choice of industrial control network to form a local monitoring system, or select the telephone lines to form a remote monitoring system.