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Chapter 4
Installing and Connecting the 1771 KRF
Indicator Label
LED State
XTMG
ON
OFF
RCVG
ON
OFF
FAULT
ON
OFF
4 12
Table 4.A
Troubleshooting with the LEDs
Definition of State
Data being transmitted from the DH/DH+ or remote I/O module through the KRF to the
broadband cable system
Data not being transmitted from the DH/DH+ or remote I/O module to the broadband cable
system
Data being received from the broadband cable system through the KRF to the DH/DH+ or
remote I/O module
Data not being received by the KRF from the broadband cable system
(A) A fault has been detected at power up, possibly caused from missing or incorrect reset
signal from I/O chassis power supply
(B) KRF has attempted to transmit on the broadband cable for more than 500 milliseconds
2
(bus hog)
(C) KRF frequency synthesizer out of lock
No fault has been detected
1
Allen-Bradley power supplies have a reset signal that is transmitted on
the backplane of the I/O chassis. If the module does not receive this
signal, it will not power-up correctly. Check to see if there is an I/O
adapter module or backplane jumper board (cat. no. 1771-EY) in the far
left slot of the chassis.
2
If the KRF has detected an error in the broadband circuitry, it will light
the Fault LED. The KRF, however, can correct some errors, so a power
cycle on the module may bring it back online (If your KRF needs frequent
power cycles to bring it back online, the module is probably defective and
should be replaced.)
1
2
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