text: <s>[INST] Power Flex 525 trips on F072 Summary: Power Flex 525 trips on F072I have around 11 nos of PF525 connected to the control logix system with L71 ( version 20) and 1756-en2tr ( supervisor enabled ) and a remote rack with 1756-en2tr ( supervisor not enabled) . The drives are connected in DLR . Under normal situations the system is fine , but once drives start one by one , a random drive trips on F072 , once i reset the drive it again works Ok for some time , but after some time any other random drive trips on F072. However if i make the network linear then the drives are running fine and there is no trip at all . but once i make network in ring the issues start appearing . I also replaced one of ethernet cable ( the one , when i removed the network becomes stable in linear ) with rockwell ethernet cable but still issues remain same. The drives do have ferrite core at the input and output Any suggestion to remove this unwanted noise ?? [/INST] The drive is reporting fault F072 on its display. Does your control network monitor network status for each Ethernet device? Is the Logix processor seeing the same dropout for whatever drive drops out? How long is each Ethernet cable connecting each node of the ring? Things to try: Change the ring supervisor over to the remote rack's EN2TR. Disable the supervisor in the primary rack. Change out the primary rack EN2TR. What would be wrong with leaving the network as linear? \\n </s>