ControlWave Instruction Manual (CI-ControlWave)
3-28 I/O Modules Revised Nov-2010
Programmer's Handbook (D5125) for more information. You can
optionally rename these variables.
You should configure these variables as alarms so you receive
notification of a failure of the backup AO module. See the
ControlWave Designer online help for information on alarm
configuration.
When a read-back failure occurs, the FAIL LED remains RED until the
unit is rebooted, either through a sideload, forced redundant
switchover, or power-down and restart, or you remove and replace the
board (hot card replacement). Each of these operations momentarily
turns the FAIL LED to GREEN (and the associated _ERR error
variable to FALSE) until a new readback failure occurs, which will
change the LED back to RED, and the associated _ERR error variable
back to TRUE.
For boards installed locally in the controller (local I/O) another system
variable (_RDN_IOERR_WARN) determines whether a failure of the
standby AO (as indicated by the LED and associated _ERR error
variable) should only be treated as a warning condition, which would
still allow a failover to occur, or as an error which would prevent a
failover to the standby.
When you set this system variable to FALSE, an AO readback failure
in the associated device is treated as an error; failover is inhibited.
When you set this variable to TRUE, an AO readback failure in the
associated device is treated as a warning that does not prevent a
failover, and the only reporting is via the _RDN_IO_x_ERR system
variables and LEDs discussed, above.
For boards residing in an I/O expansion rack, instead of a system
variable for this purpose, you must have mapped a variable from the
_ER_STAT virtual status board named either
ERSTAT_RDN_IOERR_WARN (or ERST_RDN_IOERR_WARN).
NOTE: Those are the default names, you can change them as needed.
Note: In the I/O Configurator, you must associate these boards with a
cyclic task, and the task must not run faster than 10
milliseconds.
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