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发明授权
CN107479539B 一种PLC与监控软件通讯失败的检测方法 有权

一种PLC与监控软件通讯失败的检测方法
摘要：
本发明提供了一种PLC与监控软件通讯失败的检测方法，它包括以下步骤：步骤1，初始化PLC和PC监控软件，复位通讯诊断继电器；所述通讯诊断继电器为所述PLC内部选定的中间继电器M12；步骤2，所述PC监控软件发送检测启动指令给所述PLC，告知所述PLC进入通讯检测模式；步骤3，所述PC监控软件根据设定时间A定期设定所述通讯诊断继电器的状态为True；所述PLC根据设定时间B定期设定所述通讯诊断继电器的状态为False；步骤4，所述PLC根据设定的PLC通信监控周期定时监控所述通讯诊断继电器的状态，判断所述PC监控软件与所述PLC之间的通讯状态是否失败。本发明具有设计科学、实用性强、操作简便和检测效率高的优点。
摘要（英）：

The invention provides a method for detecting failure communication between a PLC and monitoring software, which comprises the steps that 1, the PLC and the PC monitoring software are initialized, and a communication diagnosis relay is reset, wherein the communication diagnosis relay is a selected intermediate relay M12 inside the PLC; 2, the PC monitoring software sends a detection start instruction to the PLC to inform the PLC to enter a communication detection mode; 3, the PC monitoring software periodically sets the state of the communication diagnosis relay to be True according to a set time A, and the PLC periodically sets the state of the communication diagnosis relay to be False according to a set time B; and 4, the PLC monitors the state of the communication diagnosis relay at regular time according to a set PLC communication monitoring period, and judges whether the communication state between the PC monitoring software and the PLC is failed or not. The method provided by the invention has the advantages of scientific design, high practicability, simple and convenient operation and high detection efficiency.

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