400 CPU 可以运行，外部故障灯一直亮着，CPU诊断结果是module available and ok
error LED
CPU挂了个400从站。
故障报文如下
Event 106 of 120: Event ID 16# 39B1
I/O access error when updating the process image input table
P area, double-word access, access address: 224
process image partition no.: 0
not user relevant(Z1): 2942
Requested OB: Program execution error OB (OB85)
Priority class: 25
External error, Incoming event
03:05:03.916 AM 02/27/1994
各位高手给指点一下到底哪儿出了问题，