fm350有问题吗

运行8年设备，传动偶尔一直都有问题（有时几天无故障，有时间隔2小时，不固定）！！
出故障时，有时能看到cpu诊断信息如下，但有时出现如下诊断信息时，传动正常！
现场fm模块正常，无故障指示灯！！
diagnosticbufferofmodulecpu416-2dp

orderno./descriptioncomponentversion
6es7416-2xk02-0ab0hardware7
---firmwarev3.1.3

rack:0
slot:3

event1of120:eventid16#3842
moduleok
moduletype:fm
inputaddress:44
channelinformationavailable
requestedob:diagnosticinterruptob(ob82)
priorityclass:25
externalerror,outgoingevent
09:25:45.922pm04/14/2013

event2of120:eventid16#3942
moduleproblemormaintenancenecessary
moduletype:fm
inputaddress:44
hardwareinterruptlost
channelinformationavailable
module/submodulefault
internalmoduleerror
requestedob:diagnosticinterruptob(ob82)
priorityclass:25
externalerror,incomingevent
09:25:45.842pm04/14/2013

event3of120:eventid16#3842
moduleok
moduletype:fm
inputaddress:84
channelinformationavailable
requestedob:diagnosticinterruptob(ob82)
priorityclass:25
externalerror,outgoingevent
05:38:05.080pm04/14/2013

event4of120:eventid16#3942
moduleproblemormaintenancenecessary
moduletype:fm
inputaddress:84
hardwareinterruptlost
channelinformationavailable
module/submodulefault
internalmoduleerror
requestedob:diagnosticinterruptob(ob82)
priorityclass:25
externalerror,incomingevent
05:38:05.055pm04/14/2013

event5of120:eventid16#3842
moduleok
moduletype:fm
inputaddress:44
channelinformationavailable
requestedob:diagnosticinterruptob(ob82)
priorityclass:25
externalerror,outgoingevent
04:48:09.902pm04/14/2013

event6of120:eventid16#3942
moduleproblemormaintenancenecessary
moduletype:fm
inputaddress:44
hardwareinterruptlost
channelinformationavailable
module/submodulefault
internalmoduleerror
requestedob:diagnosticinterruptob(ob82)
priorityclass:25
externalerror,incomingevent
04:48:09.835pm04/14/2013

佳答案

应该和dp头松动、干扰或内部电源等有联系，可参考这里的讨论和出现的问题一样。
《s7300sf故障诊断》
https://www.ad.siemens.com.cn/club/bbs/post.aspx?b_id=4&a_id=960758