Rockwell Automation 8520 9/Series CNC Integration Maintenance Manual Documentation Set - Manual (Page 458)

Section 8
Communication Interface
8-25
9/260 Remote I/O LEDs
Assuming you have:
made all necessary remote I/O communication connections on your
1771 I/O network
configured your module for the network in AMP
written PAL to set $RMON true and to handle input and output words
you are ready to start receiving and transmitting remote I/O information.
As the remote I/O module responds to commands, you should see this LED
pattern:
Figure 8.18
LED Pattern You See When You Send a Command
A
FLT1
FLT2
ACT
LED for port B is not used.
solid green - port is configured
and connected to network
blinking red - port is configured,
but not connected to the network
solid green - module is actively linked to
9/Series CPU