300主站 200+277 3个从站，两个正常，第三个通讯不正常，报I/O写错误，接着报DP掉站， SF灯 和BU灯闪烁，接着正常 上午8点到下午3点之间工作正常，下午3点之后该站开始报错，故障灯闪烁频率逐渐增大？？
Diagnostic buffer of module CPU 313C-2 DP
Order No./ Description Component Version
6ES7 313-6CF03-0AB0 Hardware 1
- - - Firmware V 2.0.12
Rack: 0
Slot: 2
Event 1 of 10: Event ID 16# 38C4
Distributed I/Os: station return
Address of the affected DP slave: station number: 6
DP master system ID: 1
Log. base address of the DP slave: Input address: 1020
Log. base address of the DP master: 1023
Requested OB: Rack failure OB (OB86)
Priority class: 26
External error, Outgoing event
01:01:00.909 PM 09/18/1999
Event 2 of 10: Event ID 16# 2943
I/O access error, writing
P area, word access, Access address: 166
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
01:01:00.853 PM 09/18/1999
Event 3 of 10: Event ID 16# 2943
I/O access error, writing
P area, word access, Access address: 164
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
01:01:00.852 PM 09/18/1999
Event 4 of 10: Event ID 16# 2943
I/O access error, writing
P area, word access, Access address: 162
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
01:01:00.852 PM 09/18/1999
Event 5 of 10: Event ID 16# 2943
I/O access error, writing
P area, word access, Access address: 160
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
01:01:00.851 PM 09/18/1999
Event 6 of 10: Event ID 16# 2943
I/O access error, writing
P area, word access, Access address: 158
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
01:01:00.851 PM 09/18/1999
Event 7 of 10: Event ID 16# 2943
I/O access error, writing
P area, word access, Access address: 156
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
01:01:00.850 PM 09/18/1999
Event 8 of 10: Event ID 16# 2943
I/O access error, writing
P area, word access, Access address: 154
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
01:01:00.850 PM 09/18/1999
Event 9 of 10: Event ID 16# 2943
I/O access error, writing
P area, word access, Access address: 152
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
01:01:00.849 PM 09/18/1999
Event 10 of 10: Event ID 16# 2943
I/O access error, writing
P area, word access, Access address: 150
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
01:01:00.849 PM 09/18/1999
最佳答案
从下述楼主所述及诊断信息：“接着报DP掉站， SF灯 和BU灯闪烁........External error, Incoming event”判断：
、为外部错误。SF灯 和BF灯闪，BF为总线故障，SF为系统故障。SF是由BF所引起，解决BF问题则SF问题随之解决。
、检查通讯线缆、连接器件是否正常或有安装松动现象。
、检查S7-200从站系统是否停机了或有故障（查看S7-200从站CPU模块上的指示灯）。
提问者对于答案的评价：
故障已找到，新的EM277 有问题，换了个旧EM277 就好了，估计我卖到德国次品感谢各位回答，
专家置评
已阅，最佳答案正确。
原创文章，作者：more0621，如若转载，请注明出处：https://www.zhaoplc.com/plc244821.html
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