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Find Profinet problems: Difference between revisions
→Communication relations
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== Communication relations == | == Communication relations == | ||
The tab "Communication relations" lists all groups of outgoing frames from this | The tab "Communication relations" lists all groups of incoming and outgoing frames from this | ||
device. Both source and destination are shown, so the direction can be easily recognized. | |||
shown, so | |||
{| | {| | ||
| [[File:Ap-mm-profinet-device-comm-relations-alarms.png|600px|thumb|right]] | | [[File:Ap-mm-profinet-device-comm-relations-alarms.png|600px|thumb|right]] | ||
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The "Alarms" tab shows all alarms that have been sent by this device. Here the | The "Alarms" tab shows all alarms that have been sent by this device. Here the | ||
WAGO device 00:30:de:06:66:fa with the station name "montagekanuelekappe" | WAGO device 00:30:de:06:66:fa with the station name "montagekanuelekappe" sent | ||
an alarm with low priority to the VIPA device 00:20:d5:01:19:45. | an alarm with low priority to the VIPA device 00:20:d5:01:19:45. | ||
Are you interested in a capture of the data during this selected time frame for | Are you interested in a capture of the data during this selected time frame for | ||
further analysis? Just click on the | further analysis? Just click on the pcap button on the right. | ||
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In the "Profinet Real-Time" tab you | In the "Profinet Real-Time" tab you will see all real-time communication and | ||
checks for poor jitter values. | |||
How is the jitter calculated? The clock period of two adjacent frames is calculated | How is the jitter calculated? The clock period of two adjacent frames is calculated | ||
by using the cycle counters. It is then compared to the actually measured time between | by using the cycle counters. It is then compared to the actually measured time between | ||
these two frames. A good jitter value would be zero, meaning all frames arrive | these two frames. A good jitter value would be zero, meaning all frames arrive | ||
without deviation | without deviation within the same clock period. A poor jitter value would be equal to | ||
or even larger than the cycle time | or even larger than the cycle time. | ||
Does the device have a problem with sending | Does the device have a problem with sending frames and is it the only one with | ||
poor jitter values or even frame losses? Or is a Switch in the network causing | |||
the problem? Check the jitter values and errors of other Profinet devices that | the problem? Check the jitter values and errors of other Profinet devices that | ||
communicate over the same | communicate over the same Switch. Or, attach the Allegro Network Multimeter to | ||
another | another Switch and see if the jitter and errors decrease. | ||