Omron GRT1-ML2 Hardware Reference Manual page 164

Hardware reference
Label Status Description
COM off No PROFIBUS data exchange communication
on I/O data exchange on PROFIBUS is active
BF off No PROFIBUS bus communication errors
flashing Parameter values sent by the PROFIBUS master unit are invalid.
I/O data exchange is not possible.
on No PROFIBUS communication is detected by the unit
3.7.3 Node number selectors
You can use the node number selectors to assign a node number to the TJ1-
PRT. This node number identifies the TJ1-PRT in the PROFIBUS 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.
HARDWARE REFERENCE MANUAL 159