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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.

I know it may sound stupid but I am new with Studio 5000 and trying to build a project where I have to home my servo drive other than the position to zero and it is not fix but rather decided by a safety switch. What I am looking for is a dynamic Home position Entry which I am able to find it in the axis parameter but not in the CIP_Structure. Is any kind of motion FB for home position set entry? Any help would be useful. Thanks PS: Studio 5000 v30, Kinetex 5500 v7.01, L33ERM processor