em277 通讯不稳定

300主站200+2773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？？
diagnosticbufferofmodulecpu313c-2dp

orderno./descriptioncomponentversion
6es7313-6cf03-0ab0hardware1
---firmwarev2.0.12

rack:0
slot:2
event1of10:eventid16#38c4
distributedi/os:stationreturn
addressoftheaffecteddpslave:stationnumber:6
dpmastersystemid:1
log.baseaddressofthedpslave:inputaddress:1020
log.baseaddressofthedpmaster:1023
requestedob:rackfailureob(ob86)
priorityclass:26
externalerror,outgoingevent
01:01:00.909pm09/18/1999

event2of10:eventid16#2943
i/oaccesserror,writing
parea,wordaccess,accessaddress:166
requestedob:i/oaccesserrorob(ob122)
priorityclass:1
externalerror,incomingevent
01:01:00.853pm09/18/1999

event3of10:eventid16#2943
i/oaccesserror,writing
parea,wordaccess,accessaddress:164
requestedob:i/oaccesserrorob(ob122)
priorityclass:1
externalerror,incomingevent
01:01:00.852pm09/18/1999

event4of10:eventid16#2943
i/oaccesserror,writing
parea,wordaccess,accessaddress:162
requestedob:i/oaccesserrorob(ob122)
priorityclass:1
externalerror,incomingevent
01:01:00.852pm09/18/1999

event5of10:eventid16#2943
i/oaccesserror,writing
parea,wordaccess,accessaddress:160
requestedob:i/oaccesserrorob(ob122)
priorityclass:1
externalerror,incomingevent
01:01:00.851pm09/18/1999

event6of10:eventid16#2943
i/oaccesserror,writing
parea,wordaccess,accessaddress:158
requestedob:i/oaccesserrorob(ob122)
priorityclass:1
externalerror,incomingevent
01:01:00.851pm09/18/1999

event7of10:eventid16#2943
i/oaccesserror,writing
parea,wordaccess,accessaddress:156
requestedob:i/oaccesserrorob(ob122)
priorityclass:1
externalerror,incomingevent
01:01:00.850pm09/18/1999

event8of10:eventid16#2943
i/oaccesserror,writing
parea,wordaccess,accessaddress:154
requestedob:i/oaccesserrorob(ob122)
priorityclass:1
externalerror,incomingevent
01:01:00.850pm09/18/1999

event9of10:eventid16#2943
i/oaccesserror,writing
parea,wordaccess,accessaddress:152
requestedob:i/oaccesserrorob(ob122)
priorityclass:1
externalerror,incomingevent
01:01:00.849pm09/18/1999

event10of10:eventid16#2943
i/oaccesserror,writing
parea,wordaccess,accessaddress:150
requestedob:i/oaccesserrorob(ob122)
priorityclass:1
externalerror,incomingevent
01:01:00.849pm09/18/1999

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........externalerror,incomingevent”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）。