text: <s>[INST] PF755 Net Idle Fault (13035) Hello everyone, I'm working with a system that has several PowerFlex 755 on ethernet, FW14.004. Everything works how it's supposed to work, except that from times to times (and yes, it's completely random, it could be days, or even a week), a lot of them trigger the fault code 13035 (Net Idle Fault). That brings the drivers to stop, but apparently the communication returns to normal right after, because it's possible to reset the fault remotely, through the PLC network. Checking the Faults Queue on CCW for one of the driver, I can see that fault on the Port 0, but also, on the Port 13 (Ethernet/IP port), there are 3 events that happen at the exact same time as the Fault occurs. They are, in this order: Net IO Close (code 34), Net IO Idle (code 35) and Net IO Open (code 36). These 3 events happen within 3 seconds (which I assume that's the reason the drivers loses communication and reestablishes it right after). My question is: what could be causing these events/fault? Since it's very random and happens with several (but not necessarily all of them) drivers at the same time, I can only think of something wrong with the hardware or some sort of external interference. I'm attaching some screenshots for reference. Thank you [/INST] Ever have a cellphone conversation where it cuts in/out so you hang up and make a new connection? I'm guessing that what's happening here. The subnet could be flooded from broadcast... could be ARP, spanning-tree, or other loop prevention protocols. Make sure you don't have a loop. I'd tap the network and monitor it with Wireshark. Also, look for duplex mismatch. If you have an unmanaged switch, then all connected devices must be auto-duplex... Do not force 100MB FD on a device connected to an unmanaged switch. Both ends of each patch cord must match (baud rate and duplex). Since the unmanaged switch is auto-baud and auto-duplex, all the attached device must match this. If you have a managed switch, you can choose auto or force the duplex on the switch port, but the other end of the patch cable must match the switch port.. Just be consistent on both ends of each patch cable. \\n </s>