PLC控制系统时钟同步  

Time synchronization for PLC control system

作　　者：吴建明[1] WU Jian-ming(Ironmaking Plant,Shanghai Meishan Iron and Steel Co.,Ltd.,Nanjing 210039,China)

机构地区：[1]上海梅山钢铁股份有限公司炼铁厂,江苏南京210039

出　　处：《冶金自动化》2020年第2期38-42,共5页Metallurgical Industry Automation

摘　　要：PLC时钟同步是在同一网络中的所有PLC设备在时间上保持统一,以Rockwell PLC为例,使用精确时间同步协议(precise time protocol,简称PTP)来对子系统PLC进行时钟同步,以期达到全系统保持时钟一致。在高炉控制系统中,以高炉本体系统作为主时钟节点,其余的系统作为子节点,结合NTP和CIP同步两种协议,实现PLC系统和HMI系统的时钟同步。并使用PLC系统中的同步时钟来实现HMI的报警,为故障或事件发生的第一原因的查找、缩短处理时间、减少对生产的影响提供了有力的保障。PLC time synchronization is to keep the time sequence of all PLC devices the same in one network. Rockwell PLC is taken as an example and PTP time synchronization protocol is used to carry out time synchronization on the sub-system PLC,so as to achieve the whole system time consistency.In the blast furnace control system,regarding the main blast furnace body system as the main clock node and the rest of the system as a child node,the PLC system and HMI system time synchronization can be achieved combining with NTP and CIP synchronization protocols. HMI alarm can also be reached by using the synchronous time in the PLC system,which provides a powerful guarantee for the search of the first cause of failure or event,shortening the processing time and reducing the impact on production.

关 键 词：PLC HMI 控制系统 时钟同步 PTP NTP 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]