那么 1号站是不是也要把终端电阻拨到on上？ 1-3 站 CPU 后面是5号站之后是并联4 6站 我也是把 1号 4号 6号站 的终端电阻都拨到ON上 但是通讯不了 诊断如下
Diagnostic buffer of module CPU 315-2 DP

Order No./ Des cription Component Version
6ES7 315-2AG10-0AB0 Hardware 7
- - - Firmware V 2.6.6
Boot Loader Firmware expansion A 0.21.0

Rack: 0
Slot: 2


Event 1 of 10: Event ID 16# 3501
Cycle time exceeded
Run time of the last cycle (ms): 150
Cause: Current OB1 start event initiated by end of OB1 (free cycle)
Causing OB: Cyclic program (OB1)
Causing priority class: 1
Requested OB: Timing error OB (OB80)
Priority class: 26
Internal error, Incoming event
04:49:59.740 PM 06/04/1994


Event 2 of 10: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 446
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
04:49:59.734 PM 06/04/1994


Event 3 of 10: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 444
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
04:49:59.733 PM 06/04/1994


Event 4 of 10: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 442
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
04:49:59.732 PM 06/04/1994


Event 5 of 10: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 440
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
04:49:59.732 PM 06/04/1994


Event 6 of 10: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 438
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
04:49:59.731 PM 06/04/1994


Event 7 of 10: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 436
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
04:49:59.730 PM 06/04/1994


Event 8 of 10: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 434
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
04:49:59.730 PM 06/04/1994


Event 9 of 10: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 432
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
04:49:59.729 PM 06/04/1994


Event 10 of 10: Event ID 16# 2942
I/O access error, reading
P area, word access, Access address: 430
Requested OB: I/O access error OB (OB122)
Priority class: 1
External error, Incoming event
04:49:59.728 PM 06/04/1994