
Control Block Description
ADDvantage-32 PLUS
4-78
4.54 PROPORTIONAL AND INTEGRAL CONTROL WITH
CASCADED HOLD BITS (PI2)
The PI2 block performs a proportional and integral gain function on an error signal. It
has inputs for maximum and minimum limits which prevent the loop from
overcompensating as well as separate bits to hold the integrator in either the positive or
negative direction only.
FIGURE 4-54. PI2 BLOCK
1. Inputs Data Type Description
ERR: Analog Input Signal
P: Analog Proportional Gain Value
I: Analog Integral Gain Value
MAXL: Analog Output High Limit Value
MINL: Analog Output Low Limit Value
PREL: Analog Integrator Preload Value
H-UP: Bit Integrator Positive Hold Enable
H-DN: Bit Integrator Negative Hold Enable
PRE: Bit Integrator Preload Enable
+
+
+
+
ERR ERR>0 MAX
ERR<0 MIN
P
I
PRE
PREL
IERR
MINL
MIN
OUT
MAXL
MAX
PIBLOCK
Comentarios a estos manuales