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Methods of Measurement and Examples
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Methods of Measurement and Examples
2.1
Methods of Measurement
All methods of measuring have a time resolution of 10 ns. Start time and
duration of measurement can be controlled by external signals.
Data Recording
With data recording, it is possible to store every telegram in network
segment into a file. The telegrams can be selected according to some
particular criteria.
Time Measurements
By time measurements, it is also possible when which telegrams occur with
which frequency, and how much time the telegrams need between to points
in the network.
Analysis of Network Load
The network load analysis enables you to measure the network load of
different protocols on the Ethernet line. This shows up, which telegram
types occur when and cause which network load. The network load
analysis thus allows to identify and visualize unusual events.
In order to avoid erroneous measurements, take care of activating only one
single port for the measurements and thus preventing double
measurements.
2.2
Overview of Measuring Examples
Protocol
Type of measurement
Measurement
PROFINET IO
Time measurement
using a hardware filter
Cycle time, time delay of telegram passing through an IO device.
Recording of telegrams
Telegram storage with a filter, data conversion for Wireshark.
Network Load
Start-up time of PROFINET with filter on particular PROFINET
telegrams.
Time measurement
using a hardware filter
Cycle time, time delay of telegram passing through a slave and
propagation time through a ring.
EtherCAT
EtherNet/IP
sercos
Modbus/TCP
Recording of telegrams
Telegram storage with a filter, data conversion for Wireshark.
Time measurement
using a hardware filter
Cycle time master, cycle time slave, propagation time master,
propagation time slave.
Recording of telegrams
Telegram storage with a filter, data conversion for Wireshark.
Network Load
Start-up time of EtherNet/IP, ping as disturbance on the network.
Time measurement
using a hardware filter
Propagation time through primary ring, ConClk cycle time at slave.
Recording of telegrams
Telegram storage with a filter, data conversion for Wireshark.
Time measurement
using a hardware filter
Response time, propagation time, cycle time.
Recording of telegrams
Telegram storage with a filter, data conversion for Wireshark.
Network Load
Start-up time of network and ping.
Table 2: Overview of Measuring Examples
Real-Time Ethernet Kit | Analysis Examples
DOC081202UM04EN | Revision 4 | English | 2012-11 | Released | Public
© Hilscher, 2008-2012