Id - Id Controller - Siemens 353 User Manual

Function Blocks

3.2.44 ID - ID Controller

ID is an integral only controller and one of five controller
types that can be used on a one per loop basis. It uses
external feedback to provide integral action and, therefore,
allows interaction with other function blocks or external
devices, such as pneumatic controllers and shutoff
switches while eliminating windup that can occur with
other controller types. Derivative action is provided when
the parameter TD is non-zero.
When input A is high (1), the controller will operate in the
normal auto mode and when low (0) will cause the output
of the lag function to track the feedback signal. This will
cause the controller output to track the feedback within the
limits. When the controller is switched back to auto, the
value at the input of the lag (GE+FB), if the GE is non-
zero, will cause the output to integrate to a new output at
the TI time constant.
The process range pointer parameter points to a function
block that has range scaling, such as the analog input that
is providing the process variable signal. This enables the
controller to normalize the tuning parameters for the range
of the process input. If this parameter is not configured, the controller will use a range scaling of 0.00 - 100.00.
POWER UP - During a warm or cold start, the output will be initialized to the value of the MINSCALE parameter
and all dynamic states will be initialized to their current input value on the first scan cycle.
Process
P
Engineering
INput units
scaling
t
D S
RanGe
t
D
PoinTeR
D G
Lead
+
-
Engineering
INput units
scaling
S
Setpoint
.
Absolute Value
3-46
ID Controller
+
+
+ 1
S
+
e
A
-
1
-
+/
Abolute Error
BLOCK DIAGRAM
AE
ID CONTROLLER
R
Range
P
Process
S
Setpoint
F
Feedback
Auto A
RanGe PoinTeR
R G P T R
D I R A C T DIRect ACTing
T I Time - Integral
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
E N G U N I T S ENGineering UNITS
I N P U T
P INPUT P
I N P T S INPUT S
U
I N P U T F INPUT F
N P U
I T A INPUT A
E S N
Exec. Seq. No.
Lag
+ 1
GE
t
+ 1
I S
+
FB
A uto
UM353-1B
ESN = 000
ID
OR Output Range
ID
O1
Output
CONTROLLER
AE
Absolute Error
...................
loop tag.block tag
(S)
............................... NO/YES
(H)
.................. 0.001 to 4000 m/r
(S)
............ 0.00 to 100.00 min
(S)
....................... 1.00 to 30.00
(S)
................................. Real
(H)
............................... Real
(H)
P P
ecimal oint osition (preferred) .......... 0.0.0.0.0.0
(S)
................6 ASCII Char
(S)
.....................
loop tag.block tag.output
(H)
.....................
loop tag.block tag.output
(H)
.....................
(H) loop tag.block tag.output
..................... loop tag.block tag.output
(H)
........................... 001 to 250
(H)
ENG UNITS
Limit
scaling
-3.3 < O < 103.3%
Output 1
inverse scaling
Feedback
r3
(null)
(NO)
(100.0)
(0.00)
(10.00)
(0.0)
(100.0)
(0.0)
(PRCT)
(null)
(null)
(null)
(null)
O1
F
A
.
April 2012