Event 9 of 120: Event ID 16# 456F
STOP caused by rack failure (OB not loaded or not possible, or no FRB)
Breakpoint in user program: Cyclic program (OB1)
Priority class: 1
FC number: 4
Module address: 70
Previous
operating mode: RUN
Requested operating mode: STOP (internal)
Internal error, Incoming event
11:09:18.005 PM 10/21/2012

但是，系统内没有哪个模块的诊断地址是70