S7 300DP通讯故障！紧急！

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4825 产品版区：S7-300(F)/400(F)/400H(冗余)

文档类型：问题类别：产品选型问题类别：产品使用问题类别：故障诊断

CPU 315-2 DP的PLC带了几个ET200站，现在有一个分站18报故障。Distributed I/Os: station return。但是在线监视硬件组态时，这个分站显示通讯正常，并未打叉，而是CPU显示打叉状态。CPU并未停机。诊断信息为：

Event 1 of 10:  Event ID 16# 38C4
Distributed I/Os: station return
Address of the affected DP slave: station number:   18
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
01:13:42.716 AM  01/28/1994

Event 2 of 10:  Event ID 16# 2942
I/O access error, reading
P area, word access, Access address:    618
Requested OB: I/O access error OB (OB122)
Priority class:  1
External error, Incoming event
01:13:42.481 AM  01/28/1994

Event 3 of 10:  Event ID 16# 2942
I/O access error, reading
P area, word access, Access address:    616
Requested OB: I/O access error OB (OB122)
Priority class:  1
External error, Incoming event
01:13:42.481 AM  01/28/1994

Event 4 of 10:  Event ID 16# 2942
I/O access error, reading
P area, word access, Access address:    614
Requested OB: I/O access error OB (OB122)
Priority class:  1
External error, Incoming event
01:13:42.481 AM  01/28/1994

Event 5 of 10:  Event ID 16# 2942
I/O access error, reading
P area, word access, Access address:    612
Requested OB: I/O access error OB (OB122)
Priority class:  1
External error, Incoming event
01:13:42.481 AM  01/28/1994

Event 6 of 10:  Event ID 16# 2942
I/O access error, reading
P area, word access, Access address:    610
Requested OB: I/O access error OB (OB122)
Priority class:  1
External error, Incoming event
01:13:42.481 AM  01/28/1994

Event 7 of 10:  Event ID 16# 2942
I/O access error, reading
P area, word access, Access address:    608
Requested OB: I/O access error OB (OB122)
Priority class:  1
External error, Incoming event
01:13:42.481 AM  01/28/1994

Event 8 of 10:  Event ID 16# 2942
I/O access error, reading
P area, word access, Access address:    618
Requested OB: I/O access error OB (OB122)
Priority class:  1
External error, Incoming event
01:13:42.466 AM  01/28/1994

Event 9 of 10:  Event ID 16# 2942
I/O access error, reading
P area, word access, Access address:    616
Requested OB: I/O access error OB (OB122)
Priority class:  1
External error, Incoming event
01:13:42.466 AM  01/28/1994

Event 10 of 10:  Event ID 16# 2942
I/O access error, reading
P area, word access, Access address:    614
Requested OB: I/O access error OB (OB122)
Priority class:  1
External error, Incoming event
01:13:42.466 AM  01/28/1994

请各位帮忙给出解决的方法，万分感谢！

问题补充：是不是通讯干扰造成的呢？造成数据传输出现丢失的情况，但不影响通讯？？？？？

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