1. Consider the example given below to get the time
response of the system for a given unit
step input.
Interpretation according to MiPower:
We have to simplify the given transfer function (blocks)
into MiPower compatible formi.e. split the block diagram into
elementary blocks available in the free programmableblocks.
PID controller block simplification
= 6.323s + 12.80 / s + 17.99
Block diagram is as shown below:
=+
2)423.1(323.6
s
s
s
ss )025.2846.2(323.6 2
++
C(s)
R(s)
++
+
+
6.323s
12.80/s
17.999
s
1
1
1
+s 5
1
+s
C(S)+
-
R(S)
2)423.1(323.6
s
s +
)5)(1(
1
++ sss
PID Controller
8/18/2019 PID-FPB.pdf
2/5
MiPower How to Solve FPB
PRDC, Bangalore 100
To Draw Gain Block
From main menu select Elements→→→→Arithmetic
Blocks →→→→Gain or from tool box select Gain .Connect the gain
block between the nodes by double clicking on node3 and node5
respectively,which invokes gain block data screen. Give gain
constant as 17.999.
To Draw Differentiator
From main menu select Elements→→→→Functional
Blocks →→→→Differentiator or from tool box
selectDifferentiator . Connect the differentiator between the nodes
by double clicking on node3 andnode13 respectively, which invokes
differentiator block data screen. Give derivative constant as6.323.
The initial value of the output node of the differentiator i.e.
initial value of node 13 must bezero.
Give gainconstant as17.999
Give
derivativeconstant as6.323
8/18/2019 PID-FPB.pdf
3/5
MiPower How to Solve FPB
PRDC, Bangalore 101
Giveintegratorconstantas 12.8
To Draw Integrator
From main menu select Elements→→→→Functional Blocks
→→→→Integrator or from tool box selectIntegrator connect the
integrator between the nodes by double clicking on node3 and
node7respectively, which invokes integrator block data screen. Give
integrator constant as 12.80. Theinitial value of the input node of
the integrator i.e. initial value of node 3 should be zero.
Connect other Adder, Integrator and Filter blocks as explained
above. Completed FPB blockdiagram is as shown below.
8/18/2019 PID-FPB.pdf
4/5
MiPower How to Solve FPB
PRDC, Bangalore 102
After completing the block diagram select Specifications →→→→FPB
Specifications. Following screenwill open. Give time step and
simulation time as shown below.
Give disturbance data by selecting Specifications
→→→→Disturbance Data. Following screenappears. Enter the
disturbance data at node 1 with step input and time.
Now select Execute from main menu to simulate the FPB
Click here
Click OK
Click save
Click OK
20
8/18/2019 PID-FPB.pdf
5/5
MiPower How to Solve FPB
PRDC, Bangalore 103
Give the file name with .dat extension and save the file in
the required directory.
Now from main menu select Execute →→→→Simulate FPB. Then select
Execute →→→→Plot Graph
MiGraph screen will open. To plot graph follow the steps.
