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Troubleshooting
Green Status LED
The green status LED is typically used to indicate whether or not the controller is powered On (24
Vac). This is the only LED under direct software control. The green status LED is Off when you press
the Test button. The green status LED blinks during manual output testing.
describes the green status LED activity.
Table 48. Green status LED activity
Green status LED activity
On
Off
Blinking for 10 seconds,
0.25 seconds Off; 0.25 seconds On
One blink continuously,
0.25 seconds Off; 2.25 seconds On
Two blinks continuously,
0.25 seconds Off; 0.25 seconds On
0.25 seconds Off; 1.75 seconds On
a. The wink feature enables you to identify a controller. By sending a request from the
b. See the diagnostic topic in this guide for a complete list of output override
Yellow Comm LED
The yellow Comm5 LED blinks whenever another controller is transmitting. However, the yellow
Comm5 LED does not blink when the controller is transmitting data. The yellow Comm5 LED cannot
distinguish between messages meant for the controller and messages that the controller ignores.
Table 49
Table 49. Yellow Comm LED activity
Yellow Comm LED
activity
LED Off continuously
LED blinks or flickers
LED On continuously
Manual Output Test
See
this test step by step as reference when reading this section.
80
Rover™ service tool, you can request the controller to wink.
diagnostics.
shows and describes the yellow Comm LED activity.
Description
The controller is not detecting communication. (Normal for stand-
alone applications.)
The controller detects communication. (Normal for communicating
applications, including data sharing.)
Abnormal condition or extremely high traffic on the link.
"Manual Output Test," p. 28
Description
Power On, normal operation
One of the following:
• Power Off
• Controller failure
• Test button pressed
a
Wink mode
The controller is in the manual output
test mode and no output-override unit
b
diagnostic
conditions
The controller is in the manual output
test mode and one or more output-
override unit diagnostic
exist
for a description of the manual output test and how to perform
Table 48
shows and
b
conditions
CNT-SVX17G-EN
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