[RQ7.6] The MonitoringNumber in the ResponseSPDU shall be a copy of the MonitoringNumber received in the corresponding RequestSPDU. See 7.2.3.1.

NOTE The SafetyConsumer uses the ResponseSPDU.MonitoringNumber to detect mis-timed SPDUs, e.g., such SPDUs which are continuously repeated by an erroneous network element which stores data. A different MonitoringNumber is used in every RequestSPDU of a given SafetyConsumer, and a ResponseSPDU will only be accepted if its MonitoringNumber matches the MonitoringNumber in the corresponding RequestSPDU.