Profinet-CPU315-2PN-alarm-IOxS

Hi,

I used CPU 315-2pn (6es7-2eh13 :firm V2.6.7) to manage in profinet IO our Io device.

If i realized a short-circuit on the IO device so it send an alarm on the cable (check with wireshark), cpu doesn't ack this alarm.
The io device disconnect because it doesn't receive an ack from the io controller (cpu315).
I see the siemens plc display BF and SF during this short-circuitand after few second , it reconnect to the IO-device.

I actually suppose , i forgot to manage the ack form PLC program.

Can you advise me about what i need to configure (OB or block)to manage this acknoledgment ?

I want equally to know , what i need to call (OB or other) todisplay in my programIOxS status (IOCS and IOPS)?

regards
Mike