西门子300PLC出现总线闪断停机情况，现场IO有安全模块，导致生产线全线停机状况，CPU故障信息如下所示
Diagnostic buffer of module CPU 317F-2 PN/DP

Order No./ Des cription Component Version
6ES7 317-2FK13-0AB0 Hardware 4
- - - Firmware V 2.6.7
Boot Loader Firmware expansion A 10.13.9

Rack: 0
Slot: 2


Serial number: S C-WNUF27882008


Event 1 of 500: Event ID 16# 3842
Module OK
Module type: Distributed I/0s
Input address: 56
User information available
Requested OB: Diagnostic interrupt OB (OB82)
Priority class: 26
External error, Outgoing event
03:28:18.722 PM 10/09/2013
(Coding: 16# 3842 1A52 C554 0038 0023 0000)


Event 2 of 500: Event ID 16# 3842
Module OK
Module type: Distributed I/0s
Input address: 214
User information available
Requested OB: Diagnostic interrupt OB (OB82)
Priority class: 26
External error, Outgoing event
03:28:18.642 PM 10/09/2013
(Coding: 16# 3842 1A52 C554 00D6 0023 0000)


Event 3 of 500: Event ID 16# 3842
Module OK
Module type: Distributed I/0s
Input address: 220
User information available
Requested OB: Diagnostic interrupt OB (OB82)
Priority class: 26
External error, Outgoing event
03:28:18.479 PM 10/09/2013
(Coding: 16# 3842 1A52 C554 00DC 0023 0000)


Event 4 of 500: Event ID 16# 78E5
F-I/O depassivated
- Monitoring time exceeded at the safety frame detected in the F-CPU
Logical base address: 220
F-I/O database number: 820
External error, Outgoing event
03:28:18.421 PM 10/09/2013
(Coding: 16# 78E5 9F00 C47A 0334 00DC 0002)


Event 5 of 500: Event ID 16# 78E5
F-I/O depassivated
- Monitoring time exceeded at the safety frame detected in the F-CPU
Logical base address: 56
F-I/O database number: 819
External error, Outgoing event
03:28:18.421 PM 10/09/2013
(Coding: 16# 78E5 9F00 C47A 0333 0038 0002)


Event 6 of 500: Event ID 16# 3842
Module OK
Module type: Distributed I/0s
Input address: 208
User information available
Requested OB: Diagnostic interrupt OB (OB82)
Priority class: 26
External error, Outgoing event
03:28:18.400 PM 10/09/2013
(Coding: 16# 3842 1A52 C554 00D0 0023 0000)


Event 7 of 500: Event ID 16# 78E5
F-I/O depassivated
- Monitoring time exceeded at the safety frame detected in the F I/O
Logical base address: 184
F-I/O database number: 823
External error, Outgoing event
03:28:18.322 PM 10/09/2013
(Coding: 16# 78E5 9F00 C47A 0337 00B8 0008)


Event 8 of 500: Event ID 16# 78E5
F-I/O depassivated
- Monitoring time exceeded at the safety frame detected in the F I/O
Logical base address: 208
F-I/O database number: 832
External error, Outgoing event
03:28:18.322 PM 10/09/2013
(Coding: 16# 78E5 9F00 C47A 0340 00D0 0008)


Event 9 of 500: Event ID 16# 78E5
F-I/O depassivated
- Monitoring time exceeded at the safety frame detected in the F I/O
Logical base address: 214
F-I/O database number: 833
External error, Outgoing event
03:28:18.322 PM 10/09/2013
(Coding: 16# 78E5 9F00 C47A 0341 00D6 0008)


Event 10 of 500: Event ID 16# 3842
Module OK
Module type: Distributed I/0s
Input address: 184
User information available
Requested OB: Diagnostic interrupt OB (OB82)
Priority class: 26
External error, Outgoing event
03:28:18.317 PM 10/09/2013
(Coding: 16# 3842 1A52 C554 00B8 0023 0000)


Event 11 of 500: Event ID 16# 3942
Module problem or maintenance necessary
Module type: Distributed I/0s
Input address: 56
User information available
Module/submodule fault
External module error
Requested OB: Diagnostic interrupt OB (OB82)
Priority class: 26
External error, Incoming event
03:28:18.235 PM 10/09/2013
(Coding: 16# 3942 1A52 C554 0038 0523 0000)


Event 12 of 500: Event ID 16# 3942
Module problem or maintenance necessary
Module type: Distributed I/0s
Input address: 214
User information available
Module/submodule fault
External module error
Requested OB: Diagnostic interrupt OB (OB82)
Priority class: 26
External error, Incoming event
03:28:18.155 PM 10/09/2013
(Coding: 16# 3942 1A52 C554 00D6 0523 0000)


Event 13 of 500: Event ID 16# 79E5
F-I/O passivated
- Monitoring time exceeded at the safety frame detected in the F-CPU
Logical base address: 220
F-I/O database number: 820
External error, Incoming event
03:28:18.121 PM 10/09/2013
(Coding: 16# 79E5 9F00 C47A 0334 00DC 0002)


Event 14 of 500: Event ID 16# 79E5
F-I/O passivated
- Monitoring time exceeded at the safety frame detected in the F-CPU
Logical base address: 56
F-I/O database number: 819
External error, Incoming event
03:28:18.121 PM 10/09/2013
(Coding: 16# 79E5 9F00 C47A 0333 0038 0002)


Event 15 of 500: Event ID 16# 79E5
F-I/O passivated
- Monitoring time exceeded at the safety frame detected in the F I/O
Logical base address: 184
F-I/O database number: 823
External error, Incoming event
03:28:18.121 PM 10/09/2013
(Coding: 16# 79E5 9F00 C47A 0337 00B8 0008)


Event 16 of 500: Event ID 16# 79E5
F-I/O passivated
- Monitoring time exceeded at the safety frame detected in the F I/O
Logical base address: 208
F-I/O database number: 832
External error, Incoming event
03:28:18.121 PM 10/09/2013
(Coding: 16# 79E5 9F00 C47A 0340 00D0 0008)


Event 17 of 500: Event ID 16# 79E5
F-I/O passivated
- Monitoring time exceeded at the safety frame detected in the F I/O
Logical base address: 214
F-I/O database number: 833
External error, Incoming event
03:28:18.121 PM 10/09/2013
(Coding: 16# 79E5 9F00 C47A 0341 00D6 0008)


Event 18 of 500: Event ID 16# 3942
Module problem or maintenance necessary
Module type: Distributed I/0s
Input address: 184
User information available
Module/submodule fault
External module error
Requested OB: Diagnostic interrupt OB (OB82)
Priority class: 26
External error, Incoming event
03:28:18.084 PM 10/09/2013
(Coding: 16# 3942 1A52 C554 00B8 0523 0000)


Event 19 of 500: Event ID 16# 3942
Module problem or maintenance necessary
Module type: Distributed I/0s
Input address: 220
User information available
Module/submodule fault
External module error
Requested OB: Diagnostic interrupt OB (OB82)
Priority class: 26
External error, Incoming event
03:28:18.082 PM 10/09/2013
(Coding: 16# 3942 1A52 C554 00DC 0523 0000)


Event 20 of 500: Event ID 16# 3942
Module problem or maintenance necessary
Module type: Distributed I/0s
Input address: 208
User information available
Module/submodule fault
External module error
Requested OB: Diagnostic interrupt OB (OB82)
Priority class: 26
External error, Incoming event
03:28:18.074 PM 10/09/2013
(Coding: 16# 3942 1A52 C554 00D0 0523 0000)
希望有西门子高手解答一下，怎样才能确定是哪一个模块出现问题