Add Ethernet module, PLC doesn't see profibus sensors

[sdon]

I have a configuration:
1. PS 307 5A
2. CPU 315-2 DP
3. IM 365
4. AO4x12Bit
5. DI32xDC24V
6. DI32xDC24V
7. DO32xDC24V/0.5A
8. DO16xDC24V/0.5A

After included a Ethernet module and restart. PLC doesn't see a profibus sensors. Why doesn't plc see a profibus sensors?

[weiyang]

I have same question too. At last, I find that if you change your plc hardware(example add module), the system data will regenerate. If your STEP7 program file lost your profibus sensors's GSD file, then you will see this question.

Please check your GSD file, or reinstall your GSD file.

This will happened in the condition of:
1. use other computer.
2. reinstall operate system or reinstall STEP7.