各位大哥大姐,昨天我所在的钢铁厂连轧机生产线出现这么一种情况:连轧机在过钢时,突然全线轧机转速降为0,然后,大约3秒钟,又全线加速至正常.自动化配置为:S7400PLC,CPU为413-2DP,下挂一个ET200从站和8台6RA24.
故障发生后,我查了PLC故障诊断缓存:
1,Distributed I/Os:station return
Log1:base address of the DP slave:Input address:2040
Log2:base address of the DP master:2044
External error outgoing event
2,I/O access error when transferring the prosess image to output modules P area,double-word access.
External error,incoming event.
3,I/O access error when updating the process image input table P area ,double-word access.
External error,Incoming event.
ET200站地址为3.
我的问题就是它到底是不是通讯故障?怎么解释呢?谢谢了.