Kinetix 5500 Clock Jitter

[tcotterman]

Hello everyone, have you guys ever seen this issue?


plc - compactlogix 5069-l310erm rev 31.011
servo - 3 kinetix 2198-H070-ERS rev 7.001
switch - 1783-ems08t/B stratix 6000


automation network on port A2 of plc class C
enterprise network on port A1 of plc class B



As soon as I plug shopfloor into A1 or into the switch I loose the controller being the master clock and it becomes a slave. Eventually over time the clock jitter will fault out the servos.



I have tried the network in star/linear back to linear with the same results. I changed the switch to a stratix 8000 which supports cip sync. I have tried blocking ptp traffic to no avail. Without shopfloor communicating there is no issues with the clock.



Thanks.

 

[JeremyM]

Set the PLC Priority 1 attribute to a lower value. Something on the plant LAN is acting as a clock source.

 

[tcotterman]

Forgot to mention priority and tie breaker are both set at 0.

 

[JeremyM]

Get Wireshark and see whether there’s another clock source on that network.

 

[chavak]

Without shopfloor communicating there is no issues with the clock.

Thanks.

Maybe there are other system connected to the shop floor with its clock set as Master as well.
I think you can only have a single Master in the network. Maybe I am wrong

 

[tcotterman]

I contacted IT weeks ago they didn't even respond back. Thats when I changed the switch and tried blocking any ptp packets coming in. Its unplugged and they are manually selecting recipes to run instead of scanning barcodes.



Thanks for help guys.

 

[tcotterman]

This has seemed to do the trick.



https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1028845