Pidag - Pidag Controller - Siemens Moore 353 User Manual

UM353-1

3.2.79 PIDAG - PIDAG Controller

PIDAG is an adaptive gain proportional + integral
controller and is one of five controller types that can be
used on a one per loop basis. It uses external feedback to
provide integral action that allows interaction with other
function blocks or external devices, such as pneumatic
controllers, shutoff switches. PIDAG eliminates windup
that can occur with other controller types. Derivative
action is provided when the parameter TD is non-zero. The
controller includes an autotune feature that can be initiated
from the operator faceplate using the quick TUNE feature.
When input A is high (1) the controller will operate in the
normal auto mode and when low (0) causes reset R to track
(F-GE). This forces the controller output to track the
feedback within controller limits and allow the controller
to be switched back to auto without bumping the output.
The process range pointer parameter (input R) points to a
function block that has range scaling, such as the analog
input that is providing the process variable. This enables
the controller to normalize the tuning parameters for the
process range. If this parameter is not configured, the
controller will use a range scaling of 0.00-100.00.
Input I, when changed from low (0) to high (1) or from
high to low, will cause the controller to initialize (i.e.
eliminate any proportional gain action during that scan
cycle. This can be used to prevent bumping the output
when changes are made to the setpoint using a switch
block.
Process
Engineering
P
INput units
scaling
t
t
D
D G
+
-
Engineering
S
INput units
scaling
Setpoint
.
AG
Adaptive Gain
Absolute Value
March 2003
PID Adaptive Gain Controller
+
S
D
+
+ 1
S
Lead
+
e
A PG
-
1
-
+/
RanGe PoinTeR
Absolute Error
BLOCK DIAGRAM
AE
PIDAG CONTROLLER
ESN = 000
PIDAG
R
Range
P
Process
PIDAG
S
Setpoint
CONTROLLER
F
Feedback
Auto A
I
Initialize
Adaptive Gain AG
R G P T R RanGe PoinTeR
I R A C T
D DIRect ACTing
P G Proportional Gain
T I Time - Integral
(S)
T D
Time - Derivative
D G Derivative Gain
M I N S C A L E MINimum SCALE
M A X S C A L E
MAXimum SCALE
D P P
D ecimal P oint P osition (preferred)
E N G U N I T S ENGineering UNITS
A U T O T U N E
AUTOTUNE
(S)
% D E V
% DEViation
during Autotune
% H Y S % HYSteresis
during Autotune
% S T E P
% output STEP on first Autotune
A T D Y N A M
AT DYNAMic settings
A T R E S E T
AT RESET ................................... NO/YES
(S)
P O S T A T
POST Autotune Transfer
I N P U T P .....................
INPUT P
(H)
N P T
I U S INPUT S .....................
(H)
I N P U T F INPUT F ......................
(H)
I N P U A .....................
T INPUT A
(H)
I N P U T I
INPUT I .......................
(H)
I N P U T A G INPUT AG ..................
(H)
E S N
Exec. Seq. No.
ENG UNITS
+
Limit
X
-3.3 < O < 103.3%
+
Lag
R
1
t
+ 1
I S
Auto
Initialize
Function Blocks
OR
Output Range
O1
Output
AE Absolute Error
AW AT Warning
..................
loop tag.block tag (null)
(S)
............................... NO/YES
(NO)
(H)
.................. 0.001 to 100.0
(1.000)
(S)
................. 0.001 to 4000 m/r
(100.0)
............ 0.00 to 100.00 min
(0.00)
(S)
....................... 1.00 to 30.00
(10.00)
(S)
................................. Real
(H) (0.0)
............................... Real
(H) (100.0)
......... 0.0.0.0.0.0 (0.0)
(S)
................6 ASCII Char
(PRCT)
(S)
.................................. NO/YES
(YES)
(S) ... AUTO, 2.5 to 25.0 (AUTO)
. AUTO, 0.5 to 10.0 (AUTO)
(S)
........... 5% to 40% (10)
(S)
.. Fast, Medium, Slow
(S) (M)
(YES)
................ N0/YES
(S) (NO)
loop tag.block tag.output
(null)
loop tag.block tag.output (null)
loop tag.block tag.output (null)
loop tag.block tag.output
(null)
loop tag.block tag.output (null)
loop tag.block tag.output (null)
............................ 001 to 250
(H)
scaling
O1
Output 1
inverse scaling
F
Feedback
A
.
I
3-85