How to monitor devicenet failures on a 1769-SDN

Does anybody know if the Device Failure array in a 1769-SDN module will tell you if communication is lost between the scanner and the slave node?

Local:{slot#}:I.Status.DeviceFailureRegister[x].y

Device Failure Array (64 bits, one for each node, will turn on if a slave node fails or is not present)

Active Node Array (64 bits, one for each node, will turn on if a slave device is present and active)

- fuzzy logic