X-DI 64 01  3 Product Description 
HI 801 093 E Rev. 4.00  Page 15 of 52 
3.4.4  System Bus Indicators 
The system bus LEDs are labeled Sys Bus. 
LED  Color  Status  Description 
On 
Physical and logical connection to the system bus 
module in slot 1. 
Green 
Blinking1 
No physical connection to the system bus module in 
slot 1. 
A 
Yellow Blinking1 
The physical connection to the system bus module 
in slot 1 has been established. 
No connection to a (redundant) processor module 
running in system operation. 
On 
Physical and logical connection to the system bus 
module in slot 2. 
Green 
Blinking1 
No physical connection to the system bus module in 
slot 2. 
B 
Yellow Blinking1 
The physical connection to the system bus module 
in slot 2 has been established. 
No connection to a (redundant) processor module 
running in system operation. 
A+B Off  Off 
Neither physical nor logical connection to the sys-
tem bus modules in slot 1 and slot 2. 
Table 5:  System Bus Indicators 
 
3.4.5  I/O Indicators  
The LEDs of the I/O indicators are labeled Channel. 
LED  Color  Status  Description 
On  The related channel is active (energized). 
Blinking2 Channel fault 
Channel 
1…64 
Yellow 
Off  The related channel is inactive (de-energized). 
Blinking2 
Field fault on at least one channel or supply (e.g., 
overcurrent, etc.) 
Field  Red 
Off  No field fault displayed! 
Table 6:  I/O Indicators LEDs