AC450, HMI 800xA
We have AC450 which communicating with engineering station through MB300 but not comunicating with 800xA, only one node is not communicating. It is both communicating through RTA board.
Did it work before? Can you post a screenshot from the control structure --> system status viewer. And the Mb300 node status from the control structure. Please provide some more information as your question leaves a lot of room to gues what is wrong.
Have you tried rebooting the server?
Is the 800xA rta connected trough an ethernet tranceiver, if yes replace that, as these brake quite often.