造成的原因是我的CPU313C，不小心碰到了128KB的卡，CPU就报警，SF红灯亮起，无论如何RUN灯不亮。看了下是说OB121错误，然后新建了一个OB121空的，下载到PLC中去，这个时候，红灯还是亮，但RUN灯可以点亮了。
完整的解决措施是什么呢？现在我的机子还在带红灯运行哦，老火得很

Diagnostic buffer of module CPU 313C

Order No./ Des cription Component Version
6ES7 313-5BF03-0AB0 Hardware 2
- - - Firmware V 2.6.9
Boot Loader Firmware expansion A 0.21.0

Rack: 0
Slot: 2


Event 1 of 10: Event ID 16# 2522
Area length error when reading
Global DB, word access, Access address: 74
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
07:58:39:837 pm 11/24/12


Event 2 of 10: Event ID 16# 2522
Area length error when reading
Global DB, word access, Access address: 74
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
07:58:39:831 pm 11/24/12


Event 3 of 10: Event ID 16# 2522
Area length error when reading
Global DB, word access, Access address: 74
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
07:58:39:826 pm 11/24/12


Event 4 of 10: Event ID 16# 2522
Area length error when reading
Global DB, word access, Access address: 74
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
07:58:39:820 pm 11/24/12


Event 5 of 10: Event ID 16# 2522
Area length error when reading
Global DB, word access, Access address: 74
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
07:58:39:815 pm 11/24/12


Event 6 of 10: Event ID 16# 2522
Area length error when reading
Global DB, word access, Access address: 74
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
07:58:39:810 pm 11/24/12


Event 7 of 10: Event ID 16# 2522
Area length error when reading
Global DB, word access, Access address: 74
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
07:58:39:805 pm 11/24/12


Event 8 of 10: Event ID 16# 2522
Area length error when reading
Global DB, word access, Access address: 74
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
07:58:39:798 pm 11/24/12


Event 9 of 10: Event ID 16# 2522
Area length error when reading
Global DB, word access, Access address: 74
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event
07:58:39:789 pm 11/24/12


Event 10 of 10: Event ID 16# 2522
Area length error when reading
Global DB, word access, Access address: 74
Requested OB: Programming error OB (OB121)
Priority class: 1
Internal error, Incoming event