National Instruments NI-FBUS - Manual (Page 76)

Chapter 4 Parameters
© National Instruments Corporation 4-11 NI-FBUS Configurator User Manual
ALARM_HYS (Alarming)
The amount a value must move off an alarm limit, in percent of scale,
for the alarm to be considered clear. This helps prevent alarms from
constantly toggling on and off when the process value is near the
configured alarm limit.
ALARM_SUM (Alarming)
A summary of the status of alarms in the block. Allows alarms to be
disabled.
ALERT_KEY (Alarming)
A user-assigned identification number reported in alarm messages from the
block that allows HMI applications to sort and filter alarms and events.
This parameter is set for each function block to indicate which physical unit
the function block is associated with.
BAL_TIME (Tuning)
Time, in seconds, for the bias or ratio to change from the internal working
value to the operator set value. Also, the time constant used by the integral
term of the PID to obtain balance when the output is limited and the block
is in
Auto , Cas , or RCas mode.
BIAS (Tuning)
The bias value, in engineering units, used to calculate the function block
output.
BKCAL_HYS (Limiting)
The amount the block output value must move off a limit, in percent of
scale, for the limit status to be turned off.
BKCAL_IN (Limiting, Process)
Will be linked to a downstream block’s BKCAL_OUT or SELECT_OUT
parameter. This is used to initialize a control loop through cascade
initialization. Cascade initialization allows smooth transfer for a control
block from manual to automatic mode. To bypass cascade initialization,
this parameter can be left unwired and manually set to a status of
Good,
non-cascade .