Hi all,
All of sudden, the gateway keeps warning this error to all the PLCs not just one particular PLC. Java heap space is stable around 15%, haven't seen any CPU overload.
Any input would be appreciated!
Are you sure there wasn't a network disruption at that time? Or if using Virtual Machines, that the hypervisor didn't disrupt/pause Ignition?
(Those messages look like a normal network break/restore sequence, or what you'd get with a PLC download operation.)
Our IT said the connection is stable. I was suspecting the network disruption too because all of sudden this happens to all plcs.
I've tried to ping to the plc ip address from the ignition VM and my laptop with ethernet cable connecting to site, getting couple of requested time out on both of them. Not sure if this can indicate anything.
Yes, it suggests the network or the VM isn't stable. (I'd suspect the VM--IA doesn't recommend VMs when PLC drivers are present because it is hard to get the hypervisor set up right.)
You should set up a bare-metal gateway to test with. (That is, not a VM.)
Our IT found a Pilz ethernet module unit that multicasting fault signal to the traffic, creating noises to our site network. This is why Ignition had some timed out request between PLCs.
Gateway Log stopped warning immediately after we replaced the unit.
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