S7 - PID Example.pdf - TIA Portal - nicealbin

Example projects for SIMATIC PID

___________________

Standard PID Control

Professional

___________________

Modular PID Control

Example projects for SIMATIC PID

Professional

Application Examples

01/2012

A5E03806704-01

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A5E03806704-01

Ⓟ 01/2012 Technical data subject to change

Table of contents

Standard PID Control................................................................................................................................. 5

1.1

Example01: Step controller............................................................................................................ 5

1.2

Example02: Continuous controller............................................................................................... 11

1.3

Example03: Cascade control....................................................................................................... 16

1.4

Example04: Pulse controller........................................................................................................ 19

1.5

Example05: Optimize continuous controller with PID Self-Tuner................................................ 24

1.6

Example06: Optimize step controller with PID Self-Tuner........................................................... 26

1.7

Example07: Optimize pulse controller with PID Self-Tuner......................................................... 28

Modular PID Control................................................................................................................................ 31

2.1

Example08: Step controller.......................................................................................................... 31

2.1.1

Overview...................................................................................................................................... 31

2.1.2

PIDCTR_S: Fixed-setpoint controller with switching output for actuators with integrating

behavior ....................................................................................................................................... 33

2.1.3

PROC_S: Process for step controller .......................................................................................... 34

2.1.4

Putting the example into operation .............................................................................................. 35

2.2

Example09: Continuous controller............................................................................................... 36

2.2.1

Overview...................................................................................................................................... 36

2.2.2

PIDCTR_C: Fixed-setpoint controller with continuous output...................................................... 37

2.2.3

PROC_C: Process for continuous controllers.............................................................................. 38

2.2.4

Putting the example into operation .............................................................................................. 38

2.3

Example10: Pulse controller........................................................................................................ 39

2.3.1

Overview...................................................................................................................................... 39

2.3.2

PIDCTR: Master controller for continuous controller with pulse generator ................................. 41

2.3.3

PROC_P: Process for continuous controller with pulse generator.............................................. 42

2.3.4

Putting the example into operation .............................................................................................. 43

2.4

Example11: Single-loop ratio controller....................................................................................... 44

2.4.1

Overview...................................................................................................................................... 44

2.4.2

RATIOCTR: Single-loop ratio controller....................................................................................... 45

2.4.3

Putting the example into operation .............................................................................................. 46

2.5

Example12: Blending controller................................................................................................... 47

2.5.1

Overview...................................................................................................................................... 47

2.5.2

RB_CTR_C: Continuous slave controller for multi-loop ratio or blending controls...................... 49

2.5.3

Putting the example into operation .............................................................................................. 50

2.6

Example13: Controller with feedforward control.......................................................................... 51

2.6.1

Overview...................................................................................................................................... 51

2.6.2

CRT_C_FF: Controller with feedforward control.......................................................................... 52

2.6.3

Putting the example into operation .............................................................................................. 53

Example projects for SIMATIC PID Professional

Application Examples, 01/2012, A5E03806704-01

Table of contents

2.7

Example14: Range selection controller ...................................................................................... 54

2.7.1

Overview ..................................................................................................................................... 54

2.7.2

SPLITCTR: Range selection controller....................................................................................... 55

2.7.3

PROC_HCC: Process with heating and cooling branches ......................................................... 56

2.7.4

Putting the example into operation ............................................................................................. 57

2.8

Example15: Override controller................................................................................................... 58

2.8.1

Overview ..................................................................................................................................... 58

2.8.2

OVR_CTR: Override controller.................................................................................................... 59

2.8.3

Putting the example into operation ............................................................................................. 60

2.9

Example16: Optimize continuous controller with PID Self-Tuner............................................... 61

2.10

Example17: Optimize step controller with PID Self-Tuner.......................................................... 63

2.11

Example18: Optimize pulse controller with PID Self-Tuner........................................................ 65

Example projects for SIMATIC PID Professional

Application Examples, 01/2012, A5E03806704-01

Standard PID Control

1.1

Example01: Step controller

Application

Example01 comprises a standard step controller (PID_ES) in combination with a simulated

process, consisting of an actuator with integrating behavior and a downstream third-order

delay element (PT3).

With the help of Example01, you can easily generate a step controller and parameterize and

test all properties of this controller offline in a typical process.

The example makes it easy to understand the operating principle and configuration of

controllers with discontinuous output, such as they are very often used to control processes

with motorized actuators. It can therefore also be used for familiarizing and training

purposes.

Functions of Example01

The main components of Example01 are the PID_ES and PROC_S instructions. PID_ES

represents the utilized standard controller, and PROC_S simulates a process with the

"Valve" and PT3 function elements. In addition to the controlled variable, information about

the position of the actuator and any triggered endstop signals are transferred to the

controller.

DISV

Setpoint

Step controller

PID_ES

(Actuator)

PT3

Process

value

End stop signals

Position feedback

Standard PID Control

Process

Figure 1-1

Example01, control loop

The PROC_S function block simulates a series connection that consists of the integrating

actuator and three first-order delay elements. The DISV disturbance variable is always

added to the output signal of the actuator, so that process disturbances can be manually

injected at this point. The GAIN factor allows determination of the static system gain.

Example projects for SIMATIC PID Professional

Application Examples, 01/2012, A5E03806704-01

S7 - PID Example.pdf

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