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We have been having a re-occurring issue where some of our PLC's throughout our plant have a network outage that occurs around the same time every night. The PLC's are disbursed among the plant and it has been confirmed no large pieces of equipment are being turned on around this time every night... The network traffic does not fluctuate around this time and is not near a "troubling" level. There was a reboot to one of our servers on the same VLAN as the PLC's that are having the connectivity issues... What could have changed from a server reboot to remedy this issue, the server is not communicating to the PLC's, they are just on the same VLAN.
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.