我们单位有一个S7-414-3DP的cpu下挂了连个IM153-1（DP 4号和5号）机架，现在想再继续增加一个IM153-1（DP,6号）机架。
6号机架中第一个通道为DO32*24V,第二个通道为DI32*24V.使用的上位机软件为STEP7 V5.5 SP2, 当硬件下下去之后，CPU就无法工作。诊断数据如下：
Diagnostic buffer of module CPU 414-3 DP
Order No./ Des cription Component Version
6ES7 414-3XJ04-0AB0 Hardware 2
- - - Firmware V 4.1.0

Rack: 0
Slot: 3


Serial number: SVPT8378675


Event 1 of 112: Event ID 16# 39C4
Distributed I/Os: station Failure
Address of the affected DP slave: station number: 5
DP master system ID: 1
Log. base address of the DP slave: Input address: 8186
Log. base address of the DP master: 8191
Requested OB: Rack failure OB (OB86)
OB not found, or disabled, or cannot be started in the current operating mode
External error, Incoming event
12:44:18.087 PM 11/13/2012
(Coding: 16# 39C4 FE56 C054 1FFF 1FFA 0105)

Event 2 of 112: Event ID 16# 38C7
Distributed I/Os: station operational again, but error(s) in module parameter assignment
Address of the affected DP slave: station number: 5
DP master system ID: 1
Log. base address of the DP slave: Input address: 8186
Log. base address of the DP master: 8191
Requested OB: Rack failure OB (OB86)
OB not found, or disabled, or cannot be started in the current operating mode
External error, Outgoing event
12:44:18.086 PM 11/13/2012
(Coding: 16# 38C7 FE56 C054 1FFF 1FFA 0105)

Event 3 of 112: Event ID 16# 5961
Parameter assignment error in parameters for distributed S7 modules
Output address: 544 of the module with parameter assignment errors
Error type: Slot configured for CPU is not occupied or is occupied by a place holder, or a station has failed or the switched I/O system has lost its redundancy.
Data record number: 0
Operating mode: STOP (internal)
External error, Incoming event
12:44:18.084 PM 11/13/2012
(Coding: 16# 5961 FF04 C17B 007A 8220 0005)

Event 4 of 112: Event ID 16# 5961
Parameter assignment error in parameters for distributed S7 modules
Output address: 528 of the module with parameter assignment errors
Error type: Slot configured for CPU is not occupied or is occupied by a place holder, or a station has failed or the switched I/O system has lost its redundancy.
Data record number: 0
Operating mode: STOP (internal)
External error, Incoming event
12:44:18.083 PM 11/13/2012
(Coding: 16# 5961 FF04 C17B 007A 8210 0005)

Event 5 of 112: Event ID 16# 5961
Parameter assignment error in parameters for distributed S7 modules
Output address: 512 of the module with parameter assignment errors
Error type: Slot configured for CPU is not occupied or is occupied by a place holder, or a station has failed or the switched I/O system has lost its redundancy.
Data record number: 0
Operating mode: STOP (internal)
External error, Incoming event
12:44:18.083 PM 11/13/2012
(Coding: 16# 5961 FF04 C17B 007A 8200 0005)

Event 6 of 112: Event ID 16# 5961
Parameter assignment error in parameters for distributed S7 modules
Input address: 576 of the module with parameter assignment errors
Error type: Slot configured for CPU is not occupied or is occupied by a place holder, or a station has failed or the switched I/O system has lost its redundancy.
Data record number: 1
Operating mode: STOP (internal)
External error, Incoming event
12:44:18.083 PM 11/13/2012
(Coding: 16# 5961 FF04 C17B 007A 0240 0105)

Event 7 of 112: Event ID 16# 39C4
Distributed I/Os: station Failure
Address of the affected DP slave: station number: 5
DP master system ID: 1
Log. base address of the DP slave: Input address: 8186
Log. base address of the DP master: 8191
Requested OB: Rack failure OB (OB86)
OB not found, or disabled, or cannot be started in the current operating mode
External error, Incoming event
12:44:17.995 PM 11/13/2012
(Coding: 16# 39C4 FE56 C054 1FFF 1FFA 0105)

Event 8 of 112: Event ID 16# 38C7
Distributed I/Os: station operational again, but error(s) in module parameter assignment
Address of the affected DP slave: station number: 5
DP master system ID: 1
Log. base address of the DP slave: Input address: 8186
Log. base address of the DP master: 8191
Requested OB: Rack failure OB (OB86)
OB not found, or disabled, or cannot be started in the current operating mode
External error, Outgoing event
12:44:17.994 PM 11/13/2012
(Coding: 16# 38C7 FE56 C054 1FFF 1FFA 0105)

Event 9 of 112: Event ID 16# 5961
Parameter assignment error in parameters for distributed S7 modules
Output address: 544 of the module with parameter assignment errors
Error type: Slot configured for CPU is not occupied or is occupied by a place holder, or a station has failed or the switched I/O system has lost its redundancy.
Data record number: 0
Operating mode: STOP (internal)
External error, Incoming event
12:44:17.993 PM 11/13/2012
(Coding: 16# 5961 FF04 C17B 007A 8220 0005)

Event 10 of 112: Event ID 16# 5961
Parameter assignment error in parameters for distributed S7 modules
Output address: 528 of the module with parameter assignment errors
Error type: Slot configured for CPU is not occupied or is occupied by a place holder, or a station has failed or the switched I/O system has lost its redundancy.
Data record number: 0
Operating mode: STOP (internal)
External error, Incoming event
12:44:17.990 PM 11/13/2012
(Coding: 16# 5961 FF04 C17B 007A 8210 0005)

Event 11 of 112: Event ID 16# 5961
Parameter assignment error in parameters for distributed S7 modules
Output address: 512 of the module with parameter assignment errors
Error type: Slot configured for CPU is not occupied or is occupied by a place holder, or a station has failed or the switched I/O system has lost its redundancy.
Data record number: 0
Operating mode: STOP (internal)
External error, Incoming event
12:44:17.988 PM 11/13/2012
(Coding: 16# 5961 FF04 C17B 007A 8200 0005)

Event 12 of 112: Event ID 16# 5961
Parameter assignment error in parameters for distributed S7 modules
Input address: 576 of the module with parameter assignment errors
Error type: Slot configured for CPU is not occupied or is occupied by a place holder, or a station has failed or the switched I/O system has lost its redundancy.
Data record number: 0
Operating mode: STOP (internal)
External error, Incoming event
12:44:17.987 PM 11/13/2012

............

如果再次将5号机架的DP插头拨到ON位置，并重新下原来的组态（就是把6号从站的硬件组态删除了），CPU就显示一切正常。
但是就算是组态错误，为何错误是发生在原有的5号从站上面呢？
另外，OB85， 0B86， OB121， OB122这些我都是有写入CPU的。
请高手帮助分析下，原因何在，谢谢。