本人在鲁中一企业调试3台设备，3台设备都用S7-319的CPU，3台设备初次通电的一个礼拜重启都没问题，但一个礼拜以后均出现同一故障：断电后再上电CPU不能转入自动运行状态。必须先把模式开关扳到STOP状态再扳回RUN状态才能正常运行，但是断电前的设定数据全部丢失。查看诊断文件发现3台CPU几乎一样，部分文件如下：
Event 38 of 40: Event ID 16# 6326
Memory reset request due to memory replacement
Operating mode: Configuration in RUN
Incoming event
12:00:02.417 AM 01/01/1994


Event 39 of 40: Event ID 16# 4546
STOP caused by CPU memory management
Previous operating mode: STOP (own initialization)
Requested operating mode: STOP (memory reset)
Internal error, Incoming event
12:00:00.435 AM 01/01/1994


Event 40 of 40: Event ID 16# 4580
STOP: backup buffer contents inconsistent (no transition to RUN)
Previous operating mode: No voltage
Requested operating mode: STOP (own initialization)
Internal error, Incoming event
12:00:00.000 AM 01/01/1994

诊断文件给出信息说是由于CPU的内存与缓冲区的内容不一致导致存储器复位，但是实际并没有取出过MMC卡，查找良久未果。
后来西门子公司来人检查现场总线信号线路布线，且断开外接模块和总线，单独下载一程序到CPU断电再重启，依然不能自动运行。待续。。。