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4.2.5 Refresh rates – telegram jitter
The refresh rate is a firmly set value (for every device) in the control
system (e.g.1ms) that determines the refresh interval of data
between the control system and the IO device. Essential for the
actual refresh rate is the line depth, i.e. the installed network
structure and the number of device transitions. The rising number
of device transitions causes a variance in the running time of the
telegrams that is called ‚jitter‘. The measurement of the refresh
rate is to verify that the telegram jitter up and down does not
exceed half a refresh rate.
4.2.6 Connection attempts
The Connection Attempts parameter shows how often a device
attempted in vain to contact the controller after a failure.
4.2.7 Error telegrams
It gives the number of error telegrams arriving at the PROFInet-
INspektor
®
(checksum error and package fragments)
4.2.8 Package types
Different
packages are counted to get a full view of all
communication in the network. It may also be evaluated in a
graphical manner by using the network statistics item.
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