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Maintenance
190
840 USE 106 00 January 2003
Detecting Failures in the Standby Backplane
Troubleshooting
Components
To determine which component failed, compare the status of the controller, Hot
Standby module and RIO head to the chart below.
Controller CHS 110 RIO Head Failure Description
Stops All LEDs off except
READY OR COM ACT
displays error pattern
All LEDS off except
READY OR
READY on and
COM ACT blinks
once a second
Controller The Interface error
patterns are described in
Com Act Error Patterns,
p. 209
Runs as offline COM ACT displays
error pattern
READY on and
COM ACT stops
blinking
CHS 110 The Com Act error
patterns are described in
Com Act Error Patterns,
p. 209
Stops All LEDs off except
READY
COM ACT displays
error pattern
RIO Head After you have replaced
the module and cycled
power, you must perform a
program update, to ensure
that the controllers have
identical programs. Error
codes for a blinking Com
Act indicator are listed in
Com Act Error Patterns,
p. 209
Stops All LEDs off except
READY
READY on and
COM ACT blinks
four times
RIO Cable
Failure at
Standby End
In a dual cable system, the
RIO head gives no
indication if only one cable
has failed.
Runs as offline READY and COM ACT
on
COM ACT stops
blinking
Failure of Fiber
Link from
Standby
Transmit to
Primary Receive
Runs as offline READY and COM ERR
on
COM ACT stops
blinking
Failure of Fiber
Link from Primary
Transmit to
Standby Receive
Refer to following
description.