Woodward 5466-316 伍德沃德 调速器电液转换器5466系列

Woodward 5466-316 伍德沃德 调速器电液转换器5466系列

通常方法是用心跳检测，定义一个bool，HMI固定频率将该点置位，PLC收到该点为ON信号后将其复位。若在一段时间内，比如5s内没有收到该点为ON的信号，则认为通许中断。

PLC把memory clock字节传到屏上，屏用脚本把这个字节的值赋值给另外的一个PLC内的地址，然后plc内判断返回的字节两个扫描周期是否一样，如果一样说明通讯中断。1、在PLC里建立DB1数据块，里面设两个开关量“PLC秒开关”和“人机响应开关”；

The usual method is to use heartbeat detection, define a bool, the HMI fixed frequency to set the point, PLC received the point is ON signal to reset it. If the signal that the point is ON is not received within a period of time, such as 5s, it is considered to be allowed to interrupt.

PLC transfers the memory clock byte to the screen, the screen uses a script to assign the value of this byte to another address in the PLC, and then the plc determines whether the two scan cycles of the returned bytes are the same, if the same indicates that the communication is interrupted. 1. Establish DB1 data block in PLC, in which there are two switching quantities "PLC second switch" and "man-machine response switch";