A DeviceNet bus may have power supplied externally. If this external power to the bus was turned off, earlier
versions of the DeviceNet Master Module did not reestablish communications with devices on the bus when the
external power was reapplied. To restore communications, it was necessary to cycle power to the PLC.
Upgrading both the DeviceNet Master Module and the DeviceNet Slave Module to firmware release 1.18 resolves