我们给客户做的一个项目，300系统的，从17年12月份投入运行，一直正常，到今年五月份开始出现cpu无规律自动停机现象，就是cpu转到stop，重新上电又能运行，到现在越来越频繁，严重时一天一次，客户意见很大。我们更换过接口模块，直流电源，24V电源线重接过，cpu也换了，还是存在问题，怀疑某个模块有问题，但是不能确定哪一个，总不能全部更换。诊断信息也看不出哪个模块有问题，而且输入输出都正常的。OB40/55/80/82/85/86/87/121/122都下载了。

硬件组态如下：

机架0：CPU 315-2dp  IM360 321-1BH02一个 321-1FH00一个  322-1HH01六个

机架1：IM361  331-1KF02五个

机架2：IM361  332-5HD01四个

另外DP上有一个DP/MODBUS转换器，下挂八个G120变频器。

导致停机的错误信息如下：

Event 35 of 50:  Event ID 16# 1382

Request for automatic warm restart 

STOP due to: STOP due to I/O management 

Startup information:

- Startup without modified system configuration

- No difference between setpoint and actual configuration

- Time for time stamp at the last backed up power on

- Single processor operation

Current/last startup type:

- Automatic warm restart after backed up power on

Permissibility of certain startup types: 

- Manual warm restart permitted

- Automatic warm restart permitted

Last valid operation or setting of the automatic startup type at power on:

- Automatic warm restart after backed up power on

Requested OB: Startup OB (OB100)

Priority class: 27

Incoming event

02:44:34.130 AM  10/25/2018

(Coding: 16# 1382  1B64  C772  4548  0810  7710)

Event 36 of 50:  Event ID 16# 4301

Mode transition from STOP to STARTUP 

STOP due to: STOP due to I/O management 

Startup information: 

- Time for time stamp at the last backed up power on

- Single processor operation

Current/last startup type:

- Automatic warm restart after backed up power on

Permissibility of certain startup types: 

- Manual warm restart permitted

- Automatic warm restart permitted

Last valid operation or setting of the automatic startup type at power on:

- Automatic warm restart after backed up power on

Previous operating mode: STOP (internal)

Requested operating mode: STARTUP (warm restart)

Incoming event

02:44:34.038 AM  10/25/2018

(Coding: 16# 4301  FF46  C772  4548  0810  7710)

Event 46 of 50:  Event ID 16# 4548

STOP due to I/O management 

Previous mode: RUN 

Requested mode: STOP (internal)

Internal error, Incoming event

02:42:49.587 AM  10/25/2018

(Coding: 16# 4548  FF84  C000  0000  8021  0000)

已经去现场几次了，还是找不到原因，请各位大虾出出注意。