Received alarms are not checked against maximum allowed alarm frame length

During AR establishment the IO Controller and IO Device exchange information about maximum supported length of RTA frames.

In case IO Controller receives an alarm which exceeds the value exchanged at AR establishment, the alarm is currently handled and AR continues to work.

It is expected, that the AR is aborted because IO Device violates the protocol definition. The already defined error code 0xCF81FD0A ("AR alarm data too long" according to Profinet specification) shall be used to abort the AR.