Kinetix 5500 Control Sync Fault

[Twigums 3]

Problem:

I am getting a control sync fault on 2 recently installed kinetix 5500 but only when my programing PC is connected to the machine network.  Install and setup all went great over a 5 day period.  Then all of a sudden I started to get this fault. Sometimes 100 times in an hour.  As soon as I go offline, and unplug my PC the problem goes away.  I have also tried another PC connected to the Machine network and still get the same result.  Sometimes machine can run for hours with my PC connected with no problem.  I do not have to be online with controller for fault to occur.

Setup:

I have the 2 K5500's ethernet ports daisy chained together, and then connected via shielded CAT 6 cable directly to port 2 of the Compact Logix Controller

Coarse Update is set to 3.5ms and utilization's are at 33% and below.(I have tried the default 2ms with same results)

Ethernet modules are configured with FW rev 7.013.

Machine network is isolated.(not connected to plant network or internet)

Equipment:

Compact logix L33ERM Running version 30.01.

There are a total of four servos in this system all running over ethernet.  2 Kinetix 350's(not affected), and 2 kinetix 5500's.

I have tried:

separate ethernet cables for each drive ran through a switch

different ethernet cables

resetting coarse update speed

connecting a different PC for programming

 

I am just not sure where else to go with this.  Thanks in advance for any help.

 

[pturmel 135]

Those devices expect to be in a Device Level Ring.  Without completing the loop, they'll run as a degraded DLR.  Your laptop doesn't do DLR, so plugging it in breaks the DLR's timing guarantees.  Add a DLR-compatible switch, complete the ring with that switch, and plug your laptop into that switch.