That error means that the HMI and the PLC are not talking with each other at all. If the PLC was unplugged from the network, you would get such an error. You need to go through the standard process used to debug Ethernet communication between devices.
That normally entails seeing if you can ping each unit from a PC that is on the same network, verify that the lights are "on" on the Ethernet ports of your devices, double checking the IP address used in the iX Panel's controller settings for that device, etc.
_________________ Best Regards, Mark Monroe
Beijer Electronics, Inc. | Applications Engineer
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