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fseipel22 posted a topic in Allen BradleyGood Day, I am seeing intermittent bUs (communication bus) errors on 3 VFD's simultaneously. These are Yaskawa P1000's with CM092 Industrial Ethernet Cards. There are Stratix 5700 switches between the drives and the Controllogix 1756-L75 CPU. Happens every day to every week -- intermittent. Reading parameter F6-98, it indicates a 'connection time out'. I don't understand why I would receive this fault. IGMP snooping and querier are enabled on all switches, if that matters. I do not have unicast checked but Yaskawa said that didn't matter. Packet time is 100 milliseconds. I welcome any input on what might cause this. One Yaskawa tech said I should set speed to 100 Mbps (now set at 10 Mbps). Any help appreciated.