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netANALYZER Analysis Methods
9.1.5
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Determining Cycle Time and Forwarding Time (Capture Data
Mode)
The parameters cycle time and forwarding time at the capturing-mode can
be determined by the use of Wireshark from the captured and to the pcap
format converted analysis data. The procedure, how to determine the
parameters, varies with the different types of communication.
Cycle Time (Example PROFINET IRT)
The cycle time is the time difference between the time stamps of two
consecutive frames of a cyclically occurring frame type (such as the Syncframe).
1. Open in Wireshark the *.pcap file of the captured and into in the pcap
format converted analysis data. (see section Starting Data Capturing on
page 108 and section Converting Binary Files into WinPcap Format on
page 109).
2. Take in Wireshark the time difference between the time stamps of two
successive frames of a cyclically occurring frame type.
Forwarding Time (Example PROFINET IRT)
The forwarding time is the time difference between the time stamps of a
cyclically occurring frame after and of a cyclically occurring frame before a
device (e. g. Sync-frame).
1. Open in Wireshark the *.pcap file of the analysis data, captured after or
before a device and converted into in the pcap format. (see section
Starting Data Capturing on page 108 and section Converting Binary
Files into WinPcap Format on page 109).
2. Take in Wireshark the time difference between the time stamps of a
cyclically occurring frame after and of a cyclically occurring frame
before a device.
netANALYZER | Installation, Operation and Hardware Description
DOC091110UM14EN | Revision 14 | English | 2014-05 | Released | Public
© Hilscher, 2007-2014