我们公司使用的DP/AS-interface link 20E通讯块最近有常出现通讯故障，也查不出具体原因，网路结果大概是这样的CP443-5网卡下接有2个中继器、3块AS-i 和几台变频器，每次故障时CPU会纪录到其中的一个AS-i通讯故障，而每次都是不同的AS-i 发生故障，故障描述如下（Event57 为最先纪录到的）
Event 52 of 3000: Event ID 16# 38B4
I/O access error when transferring the process image to the output modules leaving state
P area, double-word access, access address: 12
process image partition no.: 0
not user relevant(Z1): 2943
Requested OB: Program execution error OB (OB85)
Priority class: 25
External error, Outgoing event
07:26:45:325 pm 01/19/09


Event 53 of 3000: Event ID 16# 38B4
9I/O access error when transferring the process image to the output modules leaving state
P area, double-word access, access address: 8
process image partition no.: 0
not user relevant(Z1): 2943
Requested OB: Program execution error OB (OB85)
Priority class: 25
External error, Outgoing event
07:26:45:324 pm 01/19/0


Event 54 of 3000: Event ID 16# 38B4
I/O access error when transferring the process image to the output modules leaving state
P area, double-word access, access address: 4
process image partition no.: 0
not user relevant(Z1): 2943
Requested OB: Program execution error OB (OB85)
Priority class: 25
External error, Outgoing event
07:26:45:323 pm 01/19/09


Event 55 of 3000: 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: 16374
Log. base address of the DP master: 16380
Requested OB: Rack failure OB (OB86)
Priority class: 25
External error, Outgoing event
07:26:45:312 pm 01/19/09


Event 56 of 3000: Event ID 16# 5879
Module error in distributed I/Os eliminated
Slot of DP master: 6
Priority class: 26
External error, Outgoing event
07:26:45:222 pm 01/19/09


Event 57 of 3000: Event ID 16# 5979
Module error in distributed I/Os occurred
Slot of DP master: 6
Priority class: 26
External error, Incoming event
07:26:45:221 pm 01/19/09