交换机报错，但是在诊断中怎么全是模块的故障！
CPUmesage，PN device 60 on PN system 100 slot 7：overload on channel 7
模块诊断，module on slot 7：load output 2 is too high
PLC诊断，
vent 120 of 120: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 0
FB number: 10
Module address: 654
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
12:38:50.546 PM 07/06/2013
(Coding: 16# 2942 017A 8E20 0000 000A 028E)


这个模块7通道2，到底怎么了？