诊断信息如下：
Diagnostic buffer of module CPU 412-2 DP
Order No./ Description Component Version
6ES7 412-2XJ05-0AB0 Hardware 2
- - - Firmware V 5.1.1
Rack: 0
Slot: 3
Serial number: SVPVN398439
Event 1 of 44: Event ID 16# 2943
I/O access error, writing
P area, double-word access, Access address: 356
FC number: 12
Module address: 344
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
07:23:21.012 AM 07/31/1996
Event 2 of 44: Event ID 16# 2942
I/O access error, reading
P area, double-word access, Access address: 358
FC number: 12
Module address: 332
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
07:23:21.012 AM 07/31/1996
Event 3 of 44: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 356
FC number: 12
Module address: 324
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
07:23:21.012 AM 07/31/1996
Event 4 of 44: Event ID 16# 2943
I/O access error, writing
P area, double-word access, Access address: 316
FC number: 12
Module address: 296
以上诊断信息是何意？是cpu本身出现问题还是与之通讯的站出现问题，或者是什么？谢谢！
