Emerson ControlWave Instruction Manual page 66

ControlWave Instruction Manual (CI-ControlWave)
3-18
failover to the standby.
When you set this system variable to FALSE, the system treats a DO
readback failure in the associated device as an error; failover is
inhibited. When you set this variable to TRUE, the system treats a DO
readback failure in the associated device 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 map 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.
In the I/O Configurator, you must associate these boards with a
Note:
cyclic task, and the task must not run faster than 10
milliseconds.
I/O Modules Revised Nov-2010