National Instruments NI-FBUS - Manual (Page 71)

Chapter 4 Parameters
NI-FBUS Configurator User Manual 4-6 ni.com
Figure 4-3. PID Scaling Procedure
Limiting
(if enabled)
CAS_IN
SP in %
of Scale
PV_SCALE
SP
SP_RATE_DN
SP_RATE_UP
SP_HI_LIM
SP_LO_LIM
IN
Filter PV_FTIME
PV_SCALE
PV
GAIN
RESET
BAL_TIME
RATE
Control
PV in %
of Scale
BYPASS (if enabled
in CONTROL_OPTS,
the switch flips)
FF_SCALE
FF_GAIN
FF_VAL
Adjustment BKCAL_IN
Adjustment to
prevent reset
windup and to
initialize the
control loop.
OUT_SCALE
% of Scale
Engineering Value
OUT_HI_LIM
OUT_LO_LIM
TRK_VAL
TRK_SCALE
Limiting
(if enabled)
Output
Tracking
OUT
TRK_IN_D
(If enabled in
CONTROL_OPTS
,
the switch flips)
Note: FF_VAL is an external
value, proportional to
disturbance in the control
loop. This value will
be converted to percent
of output scale using
FF_SCALE.
The percent
of scale value will be
multiplied by FF_GAIN
and added to the control
output if feed forward
is enabled.
Feed Forward
(if enabled)
+