154 Rockwell Automation Publication 1766-UM001O-EN-P - September 2021
Appendix C Troubleshoot Your System
Status Indicators on the LCD
Figure 68 - Status Indicators on the LCD
I/O Status Indicators on the LCD
Figure 69 - I/O Status Indicators on the LCD
Status Indicators on the LCD
Indicator Color Indicates
COMM 0
Off
(empty rectangle)
Not transmitting via RS-232/RS-485 port (Channel 0)
On
(solid rectangle)
Transmitting via RS-232/RS-485 port (Channel 0)
COMM 1
Off
(empty rectangle)
Not transmitting via Ethernet port (Channel 1)
On
(solid rectangle)
Transmitting via Ethernet port (Channel 1)
COMM 2
Off
(empty rectangle)
Not transmitting via RS-232 port (Channel 2)
On
(solid rectangle)
Transmitting via RS-232 port (Channel 2)
DCOMM
(1)
(1) When using a MicroLogix 1400 controller, the DCOMM LED applies only to Channel 0.
Off
(empty rectangle)
Configured communications (Channel 0)
On
(solid rectangle)
Default communications (Channel 0)
BAT. LO
Off
(empty rectangle)
Battery level is acceptable
On
(solid rectangle)
Battery low
U-DISP
Off
(empty rectangle)
Default display mode
On
(solid rectangle)
Customized display mode
COM
M
0
COMM1
DCOMM
B
AT.
L
O
U
-
DI
SP
COMM
2
Output status indicators (12)
Input status indicators (20)
I/O LED screen on the LCD