319的cpu，现在hmi屏蔽安全门信号时，CPU进入stop状态，现象偶发但是存在屏蔽就造成stop的故障，检查块的

Diagnostic buffer of module CPU 319F-3 PN/DP

Order No./ Description        Component                      Version                       

6ES7 318-3FL01-0AB0            Hardware                      9                             

- - -                          Firmware                      V 3.2.13                      

Boot Loader                    Firmware expansion            A 37.12.12                    

Rack:                          0

Slot:                          2

Serial number: S C-H8M857422016

Event 1 of 500:  Event ID 16# 3942

Module problem or maintenance necessary

Module type: Distributed I/0s

Input address:  3931

Channel information available

User information available 

Module/submodule fault

External module error

Channel error detected

Requested OB: Diagnostic interrupt OB (OB82)

OB not found, or disabled, or cannot be started in the in the current operating mode

External error, Incoming event

10:18:00.922 AM  08/04/2021

(Coding: 16# 3942  FE52  C554  0F5B  0D33  0000)

Event 2 of 500:  Event ID 16# 3942

Module problem or maintenance necessary

Module type: Distributed I/0s

Input address:  3941

Channel information available

User information available 

Module/submodule fault

External module error

Channel error detected

Requested OB: Diagnostic interrupt OB (OB82)

OB not found, or disabled, or cannot be started in the in the current operating mode

External error, Incoming event

10:18:00.917 AM  08/04/2021

(Coding: 16# 3942  FE52  C554  0F65  0D33  0000)

Event 3 of 500:  Event ID 16# 3942

Module problem or maintenance necessary

Module type: Distributed I/0s

Input address:  3851

Channel information available

User information available 

Module/submodule fault

External module error

Channel error detected

Requested OB: Diagnostic interrupt OB (OB82)

OB not found, or disabled, or cannot be started in the in the current operating mode

External error, Incoming event

10:18:00.912 AM  08/04/2021

(Coding: 16# 3942  FE52  C554  0F0B  0D33  0000)

Event 4 of 500:  Event ID 16# 3942

Module problem or maintenance necessary

Module type: Distributed I/0s

Input address:  3861

Channel information available

User information available 

Module/submodule fault

External module error

Channel error detected

Requested OB: Diagnostic interrupt OB (OB82)

OB not found, or disabled, or cannot be started in the in the current operating mode

External error, Incoming event

10:18:00.907 AM  08/04/2021

(Coding: 16# 3942  FE52  C554  0F15  0D33  0000)

停机是由于程序缺少OB82块，故障的源点是输入模块3831,3841,4851,3861访问有问题。

OB82 诊断中断组织块：当有诊断功能且启用了诊断功能的模块有诊断故障时如果没有下载OB82会造成CPU停机。

不知道您是如何屏蔽这个信号的，是否再屏蔽时造成某些模块故障了？之前遇到过DP从站断电，DP主站CPU停机stop但已经下载了OB86/0B87/OB121/OB122等中断且中断组织块均是空程序。诊断信息：因为OB1内的程序引用了DP从站的数据，当DP从站断电后OB1程序里数据源丢失，由于缺失OB82导致CPU停机。

您可以下载OB82/OB86/OB87/OB121/OB122逐步确认。期待您的共享。

　　　是不是有干扰，瞬间哪个通讯中断，引起远程　ＩＯ模块无反馈给ＰＬＣ　而停机？　加个　ＯＢ82再检查看看

检查一下这些信号的模块是不是因为开了安全门而掉电了