Omron GRT1-ML2 Hardware Reference Manual page 168

Hardware reference
Label Status Description
NF off No network error detected.
flashing Connection time-out detected for I/O connection with the Device-
Net master.
on Other device detected with the same node number or severe net-
work error detected.
3.8.3 Node number selectors
You can use the node number selectors to assign a node number to the TJ1-
DRT. This node number identifies the TJ1-DRT in the DeviceNet network.
The upper node number selector sets the tens of the node number. The
lower node number selector sets the units of the node number. Both
selectors range from 0 to 9. To set a selector to n, turn the arrow to point to
the label n. Refer to the chapter, Communication Protocols in the
Programming Manual.
The DeviceNet node numbers range from 0 to 63. If you select a node
number with the node number selectors that exceeds this range, you will
select the node number that is set by software. The nodes that enable
software settings are 64 to 99.
HARDWARE REFERENCE MANUAL 163