下面这个是故障信息，看着又有点像是编码器问题。
Event 2 of 120: Event ID 16# 3942
Module problem or maintenance necessary
Module type: Distributed I/0s
Input address: 16380
User information available
Diagnostic interrupt from substitute
Module/submodule fault
External module error
Requested OB: Diagnostic interrupt OB (OB82)
Priority class: 25
External error, Incoming event
03:23:19.278 PM 11/12/2013
(Coding: 16# 3942 1952 C554 3FFC 0563 0000)