[Cause]
The circuit board detected an error on the DeviceNet network. Communication with equipment is not possible.
[Countermeasure]
Check that the board baud rate matches the baud rates of all devices on the network. Check that power is supplied to the network. If the problem is not resolved, cycle the controller power. If the problem still remains, cycle the network power. If the problem cannot be resolved, check the physical network wiring.