最近因为外部故障CPU停止运行：

S7-400 PLC，416-2DP；

通过PN口连接PNPN coupler。

Event 29 of 120:  Event ID 16# 494D

STOP due to IO error

No relevance for user (Z1): 9182

No relevance for user (Z2): 03b0 (Z3): 04f9

Previous operating mode: RUN

Requested operating mode: STOP (internal)

External error, Incoming event

11:00:25.652 AM  07/18/2016

(Coding: 16# 494D  FF84  5050  9182  03B0  04F9)

Event 30 of 120:  Event ID 16# 38B3

I/O access error when updating the process image input table outgoing

Access error occurred with user data

Process image partition no.:  0

Start address of I/O area involved:   1000, Length of the area: 196

Requested OB: Program execution error OB (OB85)

Priority class: 25

External error, Outgoing event

程序里面已经调用了OB85.配置如下：

OB85.PNG

不知道大家有没有遇到相似的问题？对于IO故障的配置这样配置是否正确。

希望大家能帮忙提供一些信息，帮助分析解决该问题。

非常感谢。