Pidag - Pidag Controller - Siemens 353 User Manual

Function Blocks

3.2.69 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
E ngineering
P
IN put units
scaling
R an G e
P oin T e R
+
-
E ngineering
S
IN put units
scaling
Setpoint
.
AG
Adaptive Gain
3-74
PID Adaptive Gain Controller
t
+
D S
+
t
D
+ 1
S
D G
Lead
+
e
A
-
1
-
+/
Absolute Value
Absolute Error
BLOCK DIAGRAM
AE
PIDAG CONTROLLER
R
Range
P
Process
Setpoint S
F
Feedback
A
Auto
Initialize I
AG
Adaptive Gain
G
R P T R
D I R A C T
P G
T I
T D
D G
M I N S C A L E
M A X S C A L E
D P P
E N G U N I T S
A U T O T U N E
% D E V
% H Y S
% S T E P
A T D Y N A M
A T R E S E T
P O S T A T
I N P U T P
I N P T S
U
I N P T F
U
I N P U T A
I N P U T I
I N P U T A G
E
S N
+
X
PG
-3.3 < O < 103.3%
+
Lag
R
1
t
+ 1
I S
Auto
Initialize
ESN = 000
PIDAG
OR Output Range
PIDAG
O1
Output
CONTROLLER
AE Absolute Error
AW AT Warning
R an G e P oin T e R ..................
loop tag.block tag
(S)
DIR ect ACT ing ............................... NO/YES
(H)
P roportional G ain .................. 0.001 to 100.0
(S)
T ime - I ntegral ................. 0.001 to 4000 m/r
(S)
T ime - D erivative ............ 0.00 to 100.00 min
(S)
D erivative G ain ....................... 1.00 to 30.00
(S)
MIN imum SCALE ................................. Real
(H)
MAX imum SCALE ............................... Real
(H)
D P P
ecimal oint osition (preferred) ......... 0.0.0.0.0.0
(S)
ENG ineering UNITS ................6 ASCII Char
(S)
AUTOTUNE .................................. NO/YES
(S)
% DEV iation
during Autotune (S) ... AUTO, 2.5 to 25.0 (AUTO)
% HYS teresis during Autotune . AUTO, 0.5 to 10.0 (AUTO)
(S)
% STEP
output on first Autotune ........... 5% to 40%
(S)
AT DYNAM ic settings .. Fast, Medium, Slow
(S)
................................... NO/YES
AT RESET
(S)
POST A utotune T ransfer ................ N0/YES
(S)
INPUT P .....................
(H) loop tag.block tag.output
INPUT S .....................
loop tag.block tag.output
(H)
INPUT F ......................
(H) loop tag.block tag.output
INPUT A .....................
(H) loop tag.block tag.output
INPUT I .......................
loop tag.block tag.output
(H)
INPUT AG ..................
(H) loop tag.block tag.output
E xec. S eq. N o. ............................ 001 to 250
(H)
ENG UNITS
Limit
scaling
O1
Output 1
inverse scaling
F
F eedback
A
I
r3
UM353-1B
(null)
(NO)
(1.000)
(100.0)
(0.00)
(10.00)
(0.0)
(100.0)
(0.0)
(PRCT)
(YES)
(10)
(M)
(YES)
(NO)
(null)
(null)
(null)
(null)
(null)
(null)
.
April 2012