今天生产线运行过程中，网络突然断了，工控机和PLC的MPI连接不上了，PLC通过RS485和ET200IS也连接不上了，PLC的SF红灯亮 BF红灯闪，工控机的CP5611网卡灯不亮，这个机器用了很长时间了，一直比较正常，因为PLC配电柜了，同时也有三个交流接触器，最近交流接触器一吸合的过程中就出现网络断线的情况，不过马上就自动连接上了，PLC诊断信息是
Event 2 of 10: Event ID 16# 39C4
Distributed I/Os: station failure
Address of the affected DP slave: station number: 3
DP master system ID: 1
Log. base address of the DP slave: Input address: 2044
Log. base address of the DP master: 2047
Requested OB: Rack failure OB (OB86)
Priority class: 26
External error, Incoming event
09:39:52:428 am 04/12/11


Event 3 of 10: Event ID 16# 38C4
Distributed I/Os: station return
Address of the affected DP slave: station number: 5
DP master system ID: 1
Log. base address of the DP slave: Input address: 2042
Log. base address of the DP master: 2047
Requested OB: Rack failure OB (OB86)
Priority class: 26
External error, Outgoing event
09:08:49:439 am 04/12/11
这次连不上了。
麻烦大家帮忙看看，该重那方面入手检查这个问题，我是个新手，谢谢了。