CPU的SF灯一直亮，检查发现cpu的诊断缓冲区有错误提示。如下：
Diagnostic buffer of module CPU 414-4 H

Order No./ Des cription Component Version
6ES7 841-0CC05-0YA5 Firmware V 5.4.0

Rack: 0
Slot: 3
Event 1 of 120: Event ID 16# 2521
BCD conversion error
Affected register: accumulator 1
FC number: 2
Module address: 1734
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
15:27:48.450 2013-10-14


Event 2 of 120: Event ID 16# 2521
BCD conversion error
Affected register: accumulator 1
FC number: 2
Module address: 1710
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
15:27:48.450 2013-10-14
描述中的Module address: 1710；Module address: 1734。在FC2中是如何快速查询对应地址的？