CPU为412-3H，其上的SM326DO模块报警，内容如下
Diagnostic buffer of module FDO10xDC24V/2A

Order No./ Des cription Component Version
6ES7 326-2BF01-0AB0 Hardware 6
6ES7 326-2BF01-0AB0 Firmware V 2.0.10

DP master system: 1
Station: 6


Event 1 of 5: Event ID 16# F980:8031
Loss of Communication
External error, Incoming event


Event 2 of 5: Event ID 16# F980:0201
Monitoring time for data message frame exceeded
External error, Incoming event


Event 3 of 5: Event ID 16# F980:8004
External Auxiliary Voltage Missing
External error, Incoming event


Event 4 of 5: Event ID 16# F980:0501
External load voltage missing
External error, Incoming event


Event 5 of 5: Event ID 16# F580:8006
Module not Assigned Parameters
Internal error, Incoming event

模块上的SF常亮、红色 SAFE 常亮、绿色 请问可能是什么原因造成的