项目硬件配置：PS307 5A 、CPU315-2DP、CP343-1、IM153-1 4块、 STIOP直流电源、魏德米勒直流电源2块
PS307 只给CPU315-2DP、CP343-1 供电
STIOP直流电源 给4个机架上的模块供电
魏德米勒电源2块 给信号隔离栅、中继器供电（隔离栅和中继各用一块）
这个系统在两个PLC机柜里，配有UPS电源。前段时间突然出现主控室上位机通讯中断几秒钟的情况，同时现场设备也有一些异常情况，前后出现了两次，最后查出原因是CPU315-2DP因为电源问题暖启动了，于是让STIOP直流电源（备用的一路）给CPU和CP343-1提供电源运行一直正常。
奇怪的是，PS307给CPU供电也有2个多月了一直没有出现过这种情况。最近突然出现了，问题出现后仔细观察那个怀疑有问题的PS307，觉得上面的LED灯没有正常的那样亮，不知道是不是心里作用！大家遇到过PS307出问题的时候吗？

附缓冲区诊断--Diagnose(部分)
Event 1 of 10: Event ID 16# 4302
Mode transition from STARTUP to RUN
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 automatic startup type at power on:
- Automatic warm restart after backed up power on
Previous operating mode: STARTUP (warm restart)
Requested operating mode: RUN
Incoming event
12:09:14.134 AM 08/19/2014
(Coding: 16# 4302 FF68 C700 0000 0810 7710)


Event 2 of 10: Event ID 16# 1382
Request for automatic warm restart
STOP due to: Power failure
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
12:09:14.134 AM 08/19/2014
(Coding: 16# 1382 1B64 C772 494E 0810 7710)