F3 AIO 8/4 01  3 Product Description 
HI 800 161 E Rev. 1.01  Page 21 of 54 
3.5.1 LED Indicators 
The light-emitting diodes (LEDs) indicate the operating state of the remote I/O. The LEDs 
are classified as follows: 
  Operating voltage LED 
 System LEDs 
 Communication LEDs 
 
3.5.1.1 Operating Voltage LED 
LED  Color  Status  Description 
On  24 VDC operating voltage present 24 VDC  Green 
Off  No operating voltage 
Table 11:  Operating Voltage LED