比如下面两条诊断信息，读取错误地址是684和682,怎么定位到是具体哪个模块呢？

Event 36 of 100: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 684
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
10:57:03.835 AM 06/09/2014
(Coding: 16# 2942 017A 0020 02AC 0000 0000)


Event 37 of 100: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 682
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
10:57:03.834 AM 06/09/2014
(Coding: 16# 2942 017A 0020 02AA 0000 0000)