CPU 不能运行跳STOP，STOP due to IO error

Diagnostic buffer of module CPU 317-2 PN/DP

Order No./ Description        Component                      Version                       

6ES7 317-2EK14-0AB0            Hardware                      8                             

- - -                          Firmware                      V 3.2.14                      

Boot Loader                    Firmware expansion            A 37.12.12                    

Rack:                          ---

Slot:                          ---

Serial number: S C-J7SN08512017

Event 1 of 104:  Event ID 16# 494D

STOP due to IO error 

No relevance for user (Z2): 0050 (Z3): 4555 

Previous operating mode: STOP (internal) 

Requested operating mode: STOP (internal)

External error, Incoming event

06:31:04.174 PM  12/25/2021

(Coding: 16# 494D  FF44  C000  0000  0050  4555)

Event 2 of 104:  Event ID 16# 494D

STOP due to IO error 

No relevance for user (Z2): 0050 (Z3): 4555 

Previous operating mode: STOP (internal) 

Requested operating mode: STOP (internal)

External error, Incoming event

06:31:02.728 PM  12/25/2021

(Coding: 16# 494D  FF44  C000  0000  0050  4555)

Event 3 of 104:  Event ID 16# 494D

STOP due to IO error 

No relevance for user (Z2): 0050 (Z3): 4555 

Previous operating mode: STOP (internal) 

Requested operating mode: STOP (internal)

External error, Incoming event

06:11:03.923 PM  12/25/2021

(Coding: 16# 494D  FF44  C000  0000  0050  4555)

Event 4 of 104:  Event ID 16# 4300

Power on backed up 

Previous operating mode: No voltage

Requested operating mode: STOP (own initialization)

Incoming event

06:11:02.702 PM  12/25/2021

(Coding: 16# 4300  FFF3  0000  0000  0000  0000)

IO故障导致停机，检查IO通讯吧

发生故障时看哪个IO报错不就知道了。

IO错误造成，加组织块OB122试试

程序里面本来就有OB122,最后排查下来发现一块24点输入模块321-1BL00模块烧坏了。

换新之后，问题解决。感谢各位大佬~~~

就是准备模块，一块，一块的更换去排查，没有捷径。

或者，备份好程序。重新创建项目，一个模块一个模块的去拓展。

此次排查，我采取了第二种办法，效果明显。