Hardware reference guide

Intelligent/Special Purpose
35013379 11/2011 385
LED Indicators and Descriptions
The following figure shows the LED indicators.
The following table shows the LED descriptions.
Error Codes
The following table shows the number of times the Com Act LED blinks for each type
of error and the codes possible for that group (all codes are in hex).
LEDs Color Indication when On
Ready Green If steady: Power is being supplied to the module and it has passed
initial internal diagnostic tests. If blinking: Module is trying to
recover from an interface error.
Com Act Green If steady: CHS 110 modules are communicating. If blinking: An
error has been detected.
Primary Green Module is supporting primary controller.
Com Err Red Module is retrying communications or communications failure has
been detected.
Standby Amber If steady: Module is supporting the standby controller, which is
ready to assume the primary role if needed. If blinking: Program
update is in progress.
Number of Blinks Code Error
1 6900 error in additional transfer calculation
2 6801 ICB frame pattern error
6802 head control block error
6803 bad diagnostic request
6804 greater than 128 MSL user loadables