谢谢“菲戈”的回复，“对应的系统软件”具体是指什么呢？

另外我刚刚查了一下CPU诊断，应该有两条信息相关，麻烦帮助分析一下：
Diagnostic buffer of module CPU 315-2 DP

Order No./ Des cription Component Version
6ES7 315-2AF00-0AB0 - - - 4

Rack: 0
Slot: 2
Event 1 of 100: Event ID 16# 4562
STOP caused by programming error (OB not loaded or not possible, or no FRB)
Breakpoint in user program: Cyclic program (OB1)
Priority class: 1
FC number: 2
Module address: 488
Previous operating mode: RUN
Requested operating mode: STOP (internal)
Internal error, Incoming event
05:32:25.740 AM 02/14/1994


Event 2 of 100: Event ID 16# 253E
FB not loaded
FB number: 15
Requested OB: Programming error OB (OB121)
OB not found, or disabled, or cannot be started in the in the current operating mode
Internal error, Incoming event
05:32:25.740 AM 02/14/1994