SF and BF on S7-300 PLC

Hi there

I have PLC s7-300 with CpU 315 2DP with 3 PROFIBUS ( 1 OP 177, 3 SEW motor driver and one connection to another PLC S7-300) and one CP341 modbus slave for communication to central DCS.

I have started PLC without configuration of CP341 and all devices was in service, but when I configur CP 341 and download hardware and software to PLC SF led lighted up and BF LED blinking.

The diagnostic buffer of CPU is as follow:

Diagnostic buffer of module CPU 315-2 DP

Order No./ Description Component Version
6ES7 315-2AG10-0AB0 Hardware 5
- - - Firmware V 2.0.12

Rack: 0
Slot: 2


Event 1 of 10: Event ID 16# 4302
Mode transition from STARTUP to RUN
Startup information:
- Startup with modified system configuration
- Difference between setpoint and actual configuration
- Time for time stamp at the last backed up power on
- Single processor operation
Current/last startup type:
- Warm restart triggered by switch setting; last power on backed up
Permissibility of certain startup types:
- Manual warm restart permitted
- Automatic warm restart permitted
Last valid operation or setting of automatic startup type at power on:
- Warm restart triggered by switch setting; last power on backed up
Previous operating mode: STARTUP (warm restart)
Requested operating mode: RUN
Incoming event
07:16:38:425 pm 07/20/94


Event 2 of 10: Event ID 16# 1381
Request for manual warm restart
STOP due to: STOP caused by stop switch being activated
Startup information:
- Startup with modified system configuration
- Difference between setpoint and actual configuration
- Time for time stamp at the last backed up power on
- Single processor operation
Current/last startup type:
- Warm restart triggered by switch setting; last power on backed up
Permissibility of certain startup types:
- Manual warm restart permitted
- Automatic warm restart permitted
Last valid operation or setting of automatic startup type at power on:
- Warm restart triggered by switch setting; last power on backed up
Requested OB: Startup OB (OB100)
Priority class: 27
Incoming event
07:16:38:423 pm 07/20/94


Event 3 of 10: Event ID 16# 4301
Mode transition from STOP to STARTUP
STOP due to: STOP caused by stop switch being activated
Startup information:
- Startup with modified system configuration
- Difference between setpoint and actual configuration
- Time for time stamp at the last backed up power on
- Single processor operation
Current/last startup type:
- Warm restart triggered by switch setting; last power on backed up
Permissibility of certain startup types:
- Manual warm restart permitted
- Automatic warm restart permitted
Last valid operation or setting of the automatic startup type at power on:
- Warm restart triggered by switch setting; last power on backed up
Previous operating mode: STOP (internal)
Requested operating mode: STARTUP (warm restart)
Incoming event
07:16:37:632 pm 07/20/94


Event 4 of 10: Event ID 16# 4303
STOP caused by stop switch being activated
Previous operating mode: RUN
Requested operating mode: STOP (internal)
Incoming event
07:16:32:437 pm 07/20/94


Event 5 of 10: Event ID 16# 4302
Mode transition from STARTUP to RUN
Startup information:
- Startup with modified system configuration
- Difference between setpoint and actual configuration
- Time for time stamp at the last backed up power on
- Single processor operation
Current/last startup type:
- Warm restart triggered via MPI; last power on backed up
Permissibility of certain startup types:
- Manual warm restart permitted
- Automatic warm restart permitted
Last valid operation or setting of automatic startup type at power on:
- Warm restart triggered via MPI; last power on backed up
Previous operating mode: STARTUP (warm restart)
Requested operating mode: RUN
Incoming event
05:37:57:852 pm 07/20/94


Event 6 of 10: Event ID 16# 1381
Request for manual warm restart
STOP due to: STOP caused by PG stop operation or by SFB 20 "STOP"
Startup information:
- Startup with modified system configuration
- Difference between setpoint and actual configuration
- Time for time stamp at the last backed up power on
- Single processor operation
Current/last startup type:
- Warm restart triggered via MPI; last power on backed up
Permissibility of certain startup types:
- Manual warm restart permitted
- Automatic warm restart permitted
Last valid operation or setting of automatic startup type at power on:
- Warm restart triggered via MPI; last power on backed up
Requested OB: Startup OB (OB100)
Priority class: 27
Incoming event
05:37:57:851 pm 07/20/94


Event 7 of 10: Event ID 16# 4301
Mode transition from STOP to STARTUP
STOP due to: STOP caused by PG stop operation or by SFB 20 "STOP"
Startup information:
- Time for time stamp at the last backed up power on
- Single processor operation
Current/last startup type:
- Warm restart triggered via MPI; last power on backed up
Permissibility of certain startup types:
- Manual warm restart permitted
- Automatic warm restart permitted
Last valid operation or setting of the automatic startup type at power on:
- Warm restart triggered via MPI; last power on backed up
Previous operating mode: STOP (internal)
Requested operating mode: STARTUP (warm restart)
Incoming event
05:37:57:039 pm 07/20/94


Event 8 of 10: Event ID 16# 5371
Distributed I/Os: end of the synchronization with a DP master
Slot of the DP master: 2
Number of distributed stations: 0
Incoming event
05:37:45:900 pm 07/20/94


Event 9 of 10: Event ID 16# 4304
STOP caused by PG stop operation or by SFB 20 "STOP"
Previous operating mode: RUN
Requested operating mode: STOP (internal)
Incoming event
05:37:30:511 pm 07/20/94


Event 10 of 10: Event ID 16# 4302
Mode transition from STARTUP to RUN
Startup information:
- Time for time stamp at the last backed up power on
- Single processor operation
Current/last startup type:
- Automatic warm restart after backed up power on
Permissibility of certain startup types:
- Manual warm restart permitted
- Automatic warm restart permitted
Last valid operation or setting of automatic startup type at power on:
- Automatic warm restart after backed up power on
Previous operating mode: STARTUP (warm restart)
Requested operating mode: RUN
Incoming event
05:27:32:449 pm 07/20/94

now all PROFIBUS devices are disabled.

any body can help me?