PCS7系统，AS站为冗余410SMART，OS为单站构架。在SIMATIC MANAGER上在线后，各个站状态都正常，查看CPU诊断信息后发现报了如下几个事件，同时这些故障没有导致CPU停机：

Event 1 of 3200:  Event ID 16# 35A1
User interface (OB or FRB) not found
No relevance for user (Z1): 026c
Cause: Hardware interrupt interrupt line 1
OB number: Hardware interrupt OB (OB  40)
OB not found, or disabled, or cannot be started in the in the current operating mode
Current OB no. and priority class:
Requested OB: Hardware interrupt OB (OB 40)
OB not found, or disabled, or cannot be started in the in the current operating mode
Internal error, Incoming event
07:57:02.414 AM  09/27/2017
(Coding: 16# 35A1  FE28  C355  026C  1141  FE28)

Event 2 of 3200:  Event ID 16# 35A1
User interface (OB or FRB) not found
No relevance for user (Z1): 026c
Cause: Hardware interrupt interrupt line 1
OB number: Hardware interrupt OB (OB  40)
OB not found, or disabled, or cannot be started in the in the current operating mode
Current OB no. and priority class:
Requested OB: Hardware interrupt OB (OB 40)
OB not found, or disabled, or cannot be started in the in the current operating mode
Internal error, Incoming event
07:57:01.596 AM  09/27/2017
(Coding: 16# 35A1  FE28  C355  026C  1141  FE28)

Event 3 of 3200:  Event ID 16# 35A1
User interface (OB or FRB) not found
No relevance for user (Z1): 026c
Cause: Hardware interrupt interrupt line 1
OB number: Hardware interrupt OB (OB  40)
OB not found, or disabled, or cannot be started in the in the current operating mode
Current OB no. and priority class:
Requested OB: Hardware interrupt OB (OB 40)
OB not found, or disabled, or cannot be started in the in the current operating mode
Internal error, Incoming event
07:49:31.928 AM  09/27/2017
(Coding: 16# 35A1  FE28  C355  026C  1141  FE28)

Event 4 of 3200:  Event ID 16# 35A1
User interface (OB or FRB) not found
No relevance for user (Z1): 026c
Cause: Hardware interrupt interrupt line 1
OB number: Hardware interrupt OB (OB  40)
OB not found, or disabled, or cannot be started in the in the current operating mode
Current OB no. and priority class:
Requested OB: Hardware interrupt OB (OB 40)
OB not found, or disabled, or cannot be started in the in the current operating mode
Internal error, Incoming event
07:49:31.017 AM  09/27/2017
(Coding: 16# 35A1  FE28  C355  026C  1141  FE28)

请专家们帮忙分析下报该故障原因。